WO2009096464A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
- Publication number
- WO2009096464A1 WO2009096464A1 PCT/JP2009/051459 JP2009051459W WO2009096464A1 WO 2009096464 A1 WO2009096464 A1 WO 2009096464A1 JP 2009051459 W JP2009051459 W JP 2009051459W WO 2009096464 A1 WO2009096464 A1 WO 2009096464A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insulating film
- forming
- semiconductor layer
- layer
- film
- Prior art date
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 814
- 238000004519 manufacturing process Methods 0.000 title claims description 194
- 238000000034 method Methods 0.000 title claims description 126
- 229910021332 silicide Inorganic materials 0.000 claims abstract description 188
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims abstract description 187
- 239000000758 substrate Substances 0.000 claims abstract description 162
- 229910052710 silicon Inorganic materials 0.000 claims description 410
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 409
- 239000010703 silicon Substances 0.000 claims description 409
- 238000009792 diffusion process Methods 0.000 claims description 381
- 239000012535 impurity Substances 0.000 claims description 222
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 135
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 135
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 83
- 229920005591 polysilicon Polymers 0.000 claims description 82
- 230000001681 protective effect Effects 0.000 claims description 81
- 230000008569 process Effects 0.000 claims description 62
- 239000002184 metal Substances 0.000 claims description 52
- 229910052751 metal Inorganic materials 0.000 claims description 52
- 230000015572 biosynthetic process Effects 0.000 claims description 35
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims 2
- 239000010410 layer Substances 0.000 description 1305
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 85
- 229910052814 silicon oxide Inorganic materials 0.000 description 85
- 150000004767 nitrides Chemical class 0.000 description 50
- 230000003071 parasitic effect Effects 0.000 description 47
- 238000005530 etching Methods 0.000 description 35
- 238000002955 isolation Methods 0.000 description 35
- 238000012545 processing Methods 0.000 description 21
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 16
- 238000002513 implantation Methods 0.000 description 16
- 238000005468 ion implantation Methods 0.000 description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- 238000001459 lithography Methods 0.000 description 10
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(IV) oxide Inorganic materials O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 9
- 239000011229 interlayer Substances 0.000 description 8
- 230000009467 reduction Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000001020 plasma etching Methods 0.000 description 6
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000059 patterning Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- 229910008484 TiSi Inorganic materials 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- PEUPIGGLJVUNEU-UHFFFAOYSA-N nickel silicon Chemical compound [Si].[Ni] PEUPIGGLJVUNEU-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823814—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the source or drain structures, e.g. specific source or drain implants or silicided source or drain structures or raised source or drain structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823807—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the channel structures, e.g. channel implants, halo or pocket implants, or channel materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823821—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of transistors with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823885—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of vertical transistor structures, i.e. with channel vertical to the substrate surface
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/84—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being other than a semiconductor body, e.g. being an insulating body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/08—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind
- H01L27/085—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only
- H01L27/088—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate
- H01L27/092—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate complementary MIS field-effect transistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1203—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body the substrate comprising an insulating body on a semiconductor body, e.g. SOI
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66666—Vertical transistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7827—Vertical transistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78642—Vertical transistors
Definitions
- the present invention relates to a semiconductor device and a method for manufacturing the same, and more particularly, to a SGT (Surrounding Gate Transistor) which is a vertical MOS transistor having a columnar semiconductor and having a side wall as a channel region and a gate electrode surrounding the channel region.
- SGT Standardrounding Gate Transistor
- the present invention relates to a structure and a manufacturing method thereof.
- a vertical transistor SGT having a columnar semiconductor formed on the surface of a semiconductor substrate and a gate formed on the sidewall to surround the columnar semiconductor layer.
- patent document 1 and patent document 2 Since the source, gate, and drain of the SGT are arranged in the vertical direction, the occupied area can be greatly reduced as compared with the conventional planar type transistor. Further, since the gate surrounds the channel region, the channel controllability by the gate can be effectively improved and the steep subthreshold characteristic can be obtained as the columnar semiconductor dimensions are reduced. Furthermore, by setting the columnar semiconductor concentration and dimensions so that the columnar semiconductor is completely depleted, an improvement in mobility due to electric field relaxation in the channel region can be expected. For this reason, when SGT is used, higher integration and higher performance can be realized at the same time as compared with a conventional planar transistor.
- the first SGT formation method is a method of Patent Document 1, and after forming a columnar semiconductor layer by etching first, a gate insulating film and a gate conductive film are formed on the columnar semiconductor layer by a desired film thickness, In this method, the gate electrode is formed by etching.
- a second SGT formation method is a method of Patent Document 2, in which a gate conductive film is first formed, a contact hole is formed so as to penetrate the gate conductive curtain, and a gate insulating film and a contact hole are formed inside the contact hole. In this method, a columnar semiconductor layer is formed.
- a semiconductor device including a circuit formed by a transistor and a method for manufacturing the semiconductor device including a simple inverter having a circuit configuration and a method for manufacturing the semiconductor device are illustrated as examples. Will be described.
- FIG. 123A shows an equivalent circuit of a CMOS inverter designed using the SGT of Patent Document 1
- FIG. 123B shows a layout of the CMOS inverter, and AA ′ cut line in the layout of FIG. 123B.
- FIG. 123 (c) shows the cross-sectional structure of FIG. Referring to FIGS. 123B and 123C, an N well 1302 and a P well 1303 are formed on a Si substrate 1301, and a columnar silicon layer 1305 for forming a PMOS in the N well region is formed on the Si substrate surface.
- a columnar silicon layer 1306 for forming an NMOS is formed in the P well region, and a gate 1308 is formed so as to surround each columnar silicon layer.
- the P + drain diffusion layer 1310 formed at the bottom of the columnar semiconductor forming the PMOS and the N + drain diffusion layer 1312 formed at the bottom of the columnar semiconductor forming the NMOS are connected to the output terminal Vout14, and the columnar silicon layer forming the PMOS
- the source diffusion layer 1309 formed on the upper side is connected to the power supply potential Vcc14
- the source diffusion layer 1311 formed on the upper part of the columnar silicon layer forming the NMOS is connected to the ground potential Vss14
- the common gate 1308 of PMOS and NMOS is A CMOS inverter is formed by being connected to the input terminal Vin14.
- the occupied area of the transistor itself is smaller than that of the conventional planar type transistor.
- the element isolation is formed by LOCOS, the element isolation width is increased, the area efficiency in the integrated circuit is low, and the effect of area reduction by SGT cannot be fully utilized.
- the drain diffusion layer (1310, 1312) is lined with a contact in order to reduce the resistance, Since contacts must be formed in almost all regions on the drain diffusion layer, the degree of freedom in routing the first layer wiring is significantly limited.
- FIG. 124 (a) is an equivalent circuit diagram of the NMOS sense amplifier
- FIG. 124 (b) is a plan view of the NMOS sense amplifier
- FIG. 124 (c) is an AA ′ in the plan view of FIG. 124 (b). This is a cross-sectional structure of the cut line.
- a flip-flop is formed by NMOSs Qn151 and Qn152, and NMOSs Qn151 and Qn152 are connected to bit lines BL and BLB, respectively.
- Q151 and Q152 are connected to Qn153 which is an NMOS for activating the sense amplifier, and the source of Qn153 is connected to Vss15 which is a ground potential.
- a P well 1322 is formed on the Si substrate 1321, and a plurality of columnar silicon layers (1323 to 1328) are formed on the surface of the Si substrate.
- the two columnar silicon layers (1327, 1328) form an NMOS Qn151 constituting the sense amplifier, and the other two columnar silicon layers (1324, 1325) form another NMOS Qn152 constituting the sense amplifier. Is done.
- a gate insulating film 1329 and a gate electrode 1330 are formed on the outer periphery of each columnar silicon layer.
- N-type diffusion layers (1331, 1332) serving as a source and a drain are formed below and above each columnar silicon layer, respectively.
- the paired bit lines BL1333 and BLB1334 are connected by contacts formed on the drain diffusion layers of the MOS transistors Qn151 and Qn152, that is, the N + diffusion layer 1332 above the columnar silicon layer, respectively, by a polycrystalline silicon film.
- the gate electrode 1330 of the transistor Qn151 is taken out to the upper part of the columnar silicon layer 1323 on the upper left in the layout of FIG. 124B, and is connected to the bit line BL1333 via a contact.
- the gate electrode 1330 of the transistor Qn152 is taken out to the upper part of the columnar silicon layer 1326 which is obliquely lower right in the layout of FIG. 124B, and is connected to the bit line BLB 1334 via a contact.
- the columnar silicon layers (1323, 1326) are not provided for forming MOS transistors, but are provided as pedestals for ensuring bit line contacts when connecting the bit lines to the gate electrodes.
- a source diffusion layer 1331 formed at the bottom of the columnar silicon layer is a common source node, and is connected to Vss15 which is a ground potential by a contact 1335.
- a PMOS sense amplifier made of PMOS is formed with the same structure and layout along the same bit line.
- the backing of the source diffusion layer 1331 by the contact is essential.
- it is difficult to line the source diffusion layer with a contact so that the parasitic resistance of the source diffusion layer is increased and the circuit performance is deteriorated.
- FIG. 125 shows an outline of a process flow for forming the columnar silicon layer and the gate electrode in the conventional examples of these SGTs. This process flow will be described below.
- a columnar silicon layer 1401 is formed on a silicon substrate by etching.
- a gate insulating film 1402 is formed in FIG. 125B.
- a gate conductive film 1403 is formed in FIG. 125D.
- a gate wiring resist 1404 is formed in contact with the gate conductive film surrounding the columnar silicon layer.
- gate etching is performed.
- an SGT gate electrode and a gate wiring 1405 are formed.
- the resist is removed.
- the resist 1404 In this SGT formation method, in FIG. 125 (d), the resist 1404 must be formed so as to be just in contact with the gate conductive film on the side wall of the columnar silicon layer. It is difficult to manufacture. This will be described below.
- FIG. 126 shows a process diagram when the gate wiring resist 1404 is shifted to the right in FIG. 125 (d).
- FIG. 126 (d) shows a case where the resist is shifted to the right during exposure alignment. At this time, a space is generated between the resist 1414 and the side wall of the columnar silicon layer 1411.
- FIG. 126 (e) gate etching is performed.
- FIG. 126 (f) the resist is peeled off. In this case, the gate electrode 1413 and the gate wiring 1415 of the SGT are disconnected.
- FIG. 127 shows a process chart in the case where the gate wiring resist 1404 is shifted to the left in FIG. 125 (d).
- FIG. 127 shows a process chart in the case where the gate wiring resist 1404 is shifted to the left in FIG. 125 (d).
- 127D shows a case where the resist is shifted to the left during exposure alignment. At this time, an overlapping portion 1426 is generated between the resist 1424 and the gate electrode on the columnar silicon layer 1421.
- FIG. 127 (e) gate etching is performed.
- FIG. 127 (f) the resist is peeled off.
- the SGT gate electrode 1423 has a shape abnormality 1427 on the side where the resist is formed. As described above, the resist misalignment due to alignment always occurs depending on various patterns on the wafer and the position on the wafer. Therefore, in this SGT forming method, the process margin for forming the gate wiring becomes extremely small.
- FIG. 128A to 128E show cross-sectional structures of CMOS inverters designed using the SGT of Patent Document 2.
- FIG. 128A an N well 1502 and a P well 1501 are formed on a Si substrate, a P + diffusion layer 1504 is formed in the N well region on the Si substrate surface, and an N + diffusion layer is formed in the P well region. 1503 is formed, and the P + diffusion layer 1504 and the N + diffusion layer 1503 are separated by a LOCOS 1505.
- a columnar silicon layer 1510 for forming a PMOS is formed on the P + diffusion layer 1504, a columnar silicon layer 1509 for forming an NMOS is formed on the N + diffusion layer, and a gate 1506 is formed so as to surround each columnar silicon layer. Is done.
- the diffusion layer 1504 below the columnar silicon layer forming the PMOS is connected to the power supply potential
- the diffusion layer 1503 below the columnar silicon layer forming the NMOS is connected to the ground potential
- the gate electrode 1506 Are connected to the input potential.
- the diffusion layers (1512, 1511) above the columnar silicon layers forming the NMOS and PMOS are connected to the wiring layer 1513, and the wiring layer 1513 is connected to the output potential.
- the element isolation is performed by LOCOS similarly to the SGT structure of Patent Document 1, so that the element isolation width is increased, the area efficiency in the integrated circuit is low, and the effect of area reduction by SGT is achieved. I cannot make full use of it.
- an inverter is formed with the same configuration as in FIG. 128 (a).
- diffusion layers 1531 and 1532 above the NMOS and PMOS silicon layers are connected by a silicide layer 1533 and connected to a wiring layer 1534 through a contact formed on the silicide layer 1532.
- the diffusion layer above the NMOS and PMOS silicon layers is connected by the silicide layer 1533, so that the layout of the wiring layer is facilitated.
- the area of the inverter is determined by the areas of the diffusion layers (1523, 1524) and the element isolation 1525 below the columnar silicon layer, it cannot be made smaller than that in FIG. 128 (a).
- the manufacturing process is added to form and pattern the silicide layer, the number of manufacturing processes increases.
- both of the inverters in FIGS. 128A and 128B have a large parasitic resistance in the source diffusion layer as in the SGT of Patent Document 1, and cause deterioration in circuit performance.
- a P well 1541 is formed on the Si substrate, an N + diffusion layer 1542 is formed on the surface of the Si substrate, and a silicide layer 1543 is formed on the surface of the N + diffusion layer. Further, the N + diffusion layer 1542 and the silicide layer 1543 are separated by the LOCOS 1551.
- a columnar silicon layer 1548 for forming a PMOS and a columnar silicon layer 1547 for forming an NMOS are formed on the silicide layer 1543, and a gate 1544 is formed so as to surround each columnar silicon layer.
- the silicide layer 1543 is connected to the output potential
- the gate electrode 1544 is connected to the input potential
- the diffusion layer 1550 above the columnar silicon layer forming the PMOS is connected to the power supply potential
- the NMOS is connected.
- the diffusion layer 1549 below the columnar silicon layer to be formed is connected to the ground potential.
- the output potential is output to the substrate side.
- the P + diffusion layer region 1546 at the bottom of the columnar silicon layer 1548 and the N + diffusion layer region 1545 at the bottom of the columnar silicon layer 1547 are interposed via the silicide layer 1543. Since the element isolation for separating the P + diffusion layer 1546 and the N + diffusion layer 1545 is not necessary, the occupied area of the inverter is smaller than that of the inverter of FIGS. 128 (a) and (b). Get smaller. However, in this structure, the transistor must be formed after the silicide layer 1543 at the bottom of the columnar silicon layer is formed.
- the silicide layer has low heat resistance, and in particular, in the case of nickel silicide (NiSi) employed in fine devices of the 65 nm generation and after, the heat resistance is about 500 to 600 ° C. For this reason, when an impurity activation heat treatment of about 1000 ° C. necessary for transistor formation is applied, the silicide layer reacts excessively, which causes an increase in resistance and an increase in leakage current. Therefore, in the structure of this conventional example, it is difficult to actually manufacture stably. Further, since the silicide layer 1443 is present at the bottom of the columnar silicon layer, silicon cannot be formed by epitaxial growth during the growth of the columnar silicon layer, so that transistor characteristics are significantly deteriorated. Also in the conventional example of FIG.
- the output potential is formed on the substrate side as in the inverter of FIG.
- a silicide layer 1563 is formed at the interface between the P + diffusion layer region 1566 at the bottom of the columnar silicon layer 1568 and the N + diffusion layer 1562 on the Si substrate, so that the N + diffusion layer at the bottom of the columnar silicon layer 1567 forming the NMOS is formed. Since 1565 is connected to the N + diffusion layer 1562 on the substrate, element isolation for separating the N + diffusion layer and the P + diffusion layer is not necessary, and the area occupied by the inverter is reduced.
- the transistor is formed after the formation of the silicide layer as in FIG.
- FIG. 128 (e) shows a conventional example in Non-Patent Document 1 that describes an SGT inverter formed on an SOI substrate using the same manufacturing method as in FIGS. 128 (a) to (d).
- FIGS. 128A and 128B having the same inverter structure.
- the area occupied by the inverter can be reduced by the reduction of the element isolation width.
- the inverter will be described below. As shown in FIG.
- an N + source diffusion layer 1572 and a P + source diffusion layer 1573 are formed on the buried oxide film 1571, and a columnar silicon layer 1574 forming an NMOS is formed on the N + source diffusion layer 1572. Then, a columnar silicon layer 1575 for forming a PMOS is formed on the P + source diffusion layer. Further, an N + drain diffusion layer 1576 is formed on the columnar silicon layer 1574 forming the NMOS, and a P + drain diffusion layer 1577 is formed on the columnar silicon layer 1575 forming the PMOS. A gate 1578 is formed around each columnar silicon layer.
- the N + drain diffusion layer 1572 is connected to the ground potential via a contact extending from the wiring layer 1579, and the P + drain diffusion layer 1573 is connected to the power supply potential via a contact extending from the wiring layer 1580 to form an NMOS and a PMOS.
- the diffusion layers (1576, 1577) above the columnar silicon layer are connected to the output potential via contacts extending from the wiring layer 1581.
- element isolation is required on the substrate side.
- an SOI substrate it is not necessary to form a well, so that the element isolation width can be formed only by separating the source diffusion layers (1572, 1573) by etching.
- the occupied area can be reduced by the reduction of the element isolation width compared to the inverters of FIGS. 128A and 128B using LOCOS for element isolation.
- this conventional example also has a large parasitic resistance in the source diffusion layer, which causes the circuit performance to deteriorate.
- FIG. 129 shows an outline of a process flow for forming a columnar silicon layer and a gate electrode in the SGT shown in FIGS. 128 (a) to 128 (e). This process flow will be described below.
- a silicon oxide film 1601, a gate conductor 1602, and a silicon oxide film 1603 are formed in this order on a silicon substrate.
- a contact hole 1604 is formed so as to penetrate the silicon oxide film 1603, the gate conductor 1602, and the silicon oxide film 1601.
- a gate insulating film 1605 is formed on the inner wall of the contact hole.
- silicon is deposited in the contact hole by epitaxial growth to form a columnar silicon layer 1606.
- the upper part of the columnar silicon layer is separated.
- the columnar silicon layer is formed by etching a single crystal silicon substrate. Therefore, by performing surface treatment such as sacrificial oxidation or hydrogen annealing (Non-patent Document 2), etching or the like is performed. It is easy to recover the defects and irregularities in the generated channel portion. Therefore, high carrier mobility can be realized in the channel portion, and high-performance transistor characteristics are easily obtained.
- the columnar silicon layer is formed of silicon epitaxially grown in the contact hole, but generally there are irregularities formed during etching on the side wall of the contact hole. It is difficult to remove such irregularities.
- the unevenness is also transferred to the surface of the channel portion formed on the side wall of the contact hole, so that the carrier mobility is low and it is difficult to form a high-performance transistor.
- the contact hole size of the currently manufactured 65 nm generation LSI is about 80 nm, and considering that the contact hole will be further miniaturized in the future, sufficient epitaxial silicon is provided from the bottom of such a fine contact hole. It is difficult to form a film with a yield.
- Japanese Patent Laid-Open No. 2-188966 Japanese Patent Laid-Open No. 7-99311 S. Maeda et al. “Impact of a Vertical ⁇ -Shape Transistor Cell for 1 Gbit DRAM and Beyond”, IEEE TRANSACTION ON ELECTRON DEVICES, December 1995, VOL. 42, NO. 12, pp. 2117-2124 Y. -K Choi et al. , “FinFET Process Definitions for Improved Mobility and Gate Work Function Engineering”, International Electron Device Technology Technical, 2002. 259
- the SGT structure and the formation method by the first method are superior to the SGT structure and the formation method by the second method for realizing high-integration, high-performance, and high-yield SGT.
- the SGT structure and formation method according to the first method have the following problems. First, to realize a reduction in the area of the element and an element isolation with a high area efficiency, thereby reducing the area occupied by the circuit. Second, in order to improve the performance of the transistor, the parasitic capacitance and parasitic resistance of the source / drain portion are reduced. Third, to realize a process having a wide process margin in forming the gate wiring.
- the present invention has been made in view of the above problems, and an object of the present invention is to propose an SGT capable of higher integration and higher performance as compared with a conventional SGT and a method for manufacturing the same.
- a first aspect of the present invention is a semiconductor device including a circuit in which either the drain or the source of the first MOS transistor is connected to either the drain or the source of the second MOS transistor, And an insulating film on the substrate, and a planar semiconductor layer formed on the insulating film on the substrate, wherein the first MOS transistor has a first drain / source formed in the planar semiconductor layer.
- the MOS transistor includes a third drain / source region formed in the planar semiconductor layer, a columnar semiconductor layer formed on the planar semiconductor layer, and a fourth source formed on the columnar semiconductor.
- a semiconductor device characterized in that a silicide layer is formed is provided.
- the silicide layer is formed on the entire surface of the planar semiconductor layer including the first drain / source region and the third drain / source region.
- a contact is formed on the silicide layer.
- the first MOS transistor and the second MOS transistor are different conductivity type MOS transistors.
- a second aspect of the present invention is a semiconductor device including a circuit in which either the drain or the source of the first MOS transistor and either the drain or the source of the second MOS transistor are connected, And an insulating film on the substrate, and a planar semiconductor layer formed on the insulating film on the substrate, wherein the first MOS transistor has a first drain / source formed in the planar semiconductor layer.
- the MOS transistor includes a third drain / source region formed in the planar semiconductor layer, a columnar semiconductor layer formed on the planar semiconductor layer, and a fourth source formed on the columnar semiconductor.
- the first MOS transistor and the second MOS transistor are MOS transistors of different conductivity types, and are disposed adjacent to each other, including gate / drain regions and gates formed on the sidewalls of the columnar semiconductor layers.
- the present invention provides a semiconductor device characterized in that a contact is formed on an upper portion of a planar semiconductor layer at an adjacent boundary between the first drain / source region and the third drain / source region.
- the first MOS transistor and the second MOS transistor are arranged adjacent to each other.
- At least one gate wiring extending from the gate electrode to the contact includes a portion extending along the first drain / source region or the third drain / source region, and a portion extending along the insulating film on the substrate. Including both parts.
- the first drain / source region or the third drain / source region drain diffusion region along which the gate wiring extends has an end face in the vicinity of the columnar semiconductor layer.
- the gate electrodes of the first MOS transistor and the second MOS transistor are connected to each other by a gate wiring, and the first drain / source includes a part corresponding to a part where the gate wiring is disposed.
- a region or a part of the third drain / source region is removed, and the gate wiring extends along a side surface of the removed drain / source region and an insulating film on the substrate below the removed drain / source region. Arranged.
- the circuit is a CMOS inverter, and the gate electrodes of the first MOS transistor and the second MOS transistor are connected by a gate wiring extending from the gate electrode to the substrate side.
- the contact between the gate electrodes of the first MOS transistor and the second MOS transistor, to which the gate electrodes are connected is a columnar semiconductor layer of the first MOS transistor and a columnar semiconductor of the second MOS transistor. Formed between the layers.
- the first drain / source region and the third drain / source region are formed between the columnar semiconductor layer of the first MOS transistor and the columnar semiconductor layer of the second MOS transistor in which the contact is formed. It is an adjacent boundary part.
- a part of the first drain / source region or the third drain / source region including a part corresponding to a part where the gate wiring is disposed is removed, and the gate wiring is removed.
- the drain / source region is disposed along the insulating film on the substrate under the removed drain / source region.
- the position where the contact is formed is also an upper part of the removed drain / source region.
- a part of the first drain / source region or the third drain / source region including a part corresponding to a part where the gate wiring is disposed is removed, and the gate wiring is removed.
- the drain / source region is disposed along the insulating film on the substrate under the removed drain / source region.
- the gate electrode is formed integrally with the gate wiring, and the entire upper surface of the gate electrode and the gate wiring formed integrally is formed on a surface parallel to the substrate, and a contact to the gate electrode is parallel to the substrate. It is provided in contact with the upper surface formed on the flat surface.
- a second insulating film is provided between the first insulating film formed under the gate electrode and a gate wiring extending from the gate electrode to the substrate side, and the planar semiconductor layer and the insulating film on the substrate. Intervenes.
- the second insulating film has a relative dielectric constant smaller than that of the first insulating film.
- the gate electrode is formed by a laminated structure of a thin metal film and a polysilicon layer, the gate electrode is formed integrally with the gate wiring, and the upper surface of the integrally formed gate electrode and gate wiring is formed. Is formed on a surface parallel to the substrate, and a contact with the gate electrode is provided on the upper surface of the gate electrode formed on the surface parallel to the substrate, and the thin metal film is connected to the polysilicon layer. Between the columnar semiconductor layer, the first drain / source region, the third drain / source region, and the insulating film formed on the insulating film on the substrate.
- a second insulating film is interposed between the integrally formed gate electrode and the first insulating film formed under the gate wiring, and the planar semiconductor layer and the insulating film on the substrate. To do.
- the second insulating film has a relative dielectric constant smaller than that of the first insulating film.
- a semiconductor device including a circuit in which either the drain or the source of the first MOS transistor and either the drain or the source of the second MOS transistor are connected. And an insulating film on the substrate, and a planar semiconductor layer formed on the insulating film on the substrate, wherein the first MOS transistor has a first drain / source formed in the planar semiconductor layer.
- the MOS transistor includes a third drain / source region formed on the planar semiconductor layer, a columnar semiconductor layer formed on the planar semiconductor layer, and a fourth source formed on the top surface of the columnar semiconductor.
- the size of the upper surface is larger than the size of the upper surface of the columnar semiconductor layer, and at least part of the upper portion of the first drain / source region of the first MOS transistor and the third drain / source of the second MOS transistor. It is an object of the present invention to provide a semiconductor device in which a silicide layer is formed to connect at least a part of an upper portion of a region.
- a silicide layer is formed on a surface of the second source / drain region or the fourth source / drain region.
- the size of the silicide layer formed on the surface of the second source / drain region or the fourth source / drain region is larger than the size of the upper surface of the columnar semiconductor layer.
- a first contact or a second contact is formed on the second source / drain region formed on the upper surface of the columnar semiconductor layer or on the upper surface of the fourth source / drain region formed on the upper surface of the columnar semiconductor layer.
- the sizes of the second source / drain regions formed on the upper surface of the columnar semiconductor and the upper surfaces of the fourth source / drain regions formed on the upper surface of the columnar semiconductor are respectively the first contact and the second
- Each of the columnar semiconductor layers having a size larger than the bottom surface of the contact, the bottom surface of the first contact or the second contact being the top surface of the second source / drain region or the fourth source / drain region. It is larger than the size of the upper surface.
- the second source / drain region or the fourth source / drain region is formed so as to cover an upper portion of the gate electrode through a fourth insulating film.
- a silicide layer is formed on a surface of the second source / drain region or the fourth source / drain region.
- one or both of the first MOS transistor and the second MOS transistor are each composed of a plurality of columnar semiconductor layers, and the second source / drain region is formed on the upper surface of the plurality of columnar semiconductor layers.
- the fourth source / drain region is integrally formed.
- the second source / drain region or the fourth source / drain region is an epitaxial layer.
- the second source / drain region or the fourth source / drain region is an epitaxial silicon layer in the case of n-type, and the second source / drain region or the fourth source / drain region is p-type. In some cases, it is an epitaxial germanium layer.
- one or both of the first MOS transistor and the second MOS transistor are each composed of a plurality of columnar semiconductor layers, and the upper surface of at least two or more columnar semiconductor layers of the plurality of columnar semiconductor layers.
- the second source / drain region or the fourth source / drain region is integrally formed.
- only the plurality of columnar semiconductor layers constituting the first MOS transistor or the second MOS transistor adjacent to each other with a predetermined distance or less are disposed on the upper surface of the plurality of columnar semiconductor layers.
- / Drain region or fourth source / drain region is integrally formed.
- a sidewall of the second source / drain region, a sidewall of the fourth source / drain region, or the gate electrode is covered with a silicon nitride film.
- the silicon nitride film has stress and applies stress to the channel portion of the columnar semiconductor layer.
- the planar semiconductor layer is formed thin, and the thickness of the silicide layer is smaller than the thickness of the planar semiconductor layer.
- the silicide layer is formed up to the insulating film on the substrate.
- a silicide layer is formed on an upper surface of the second source / drain region or the fourth source / drain region.
- one or both of the first MOS transistor and the second MOS transistor are each composed of a plurality of columnar semiconductor layers, and the second source / drain of at least two of the plurality of columnar semiconductor layers is provided.
- a contact formed on the upper surface of the diffusion region or the fourth source / drain diffusion region of at least two of the plurality of columnar semiconductor layers is used as a common contact.
- the contact formed on the second source / drain region or the fourth source / drain region and the contact with the gate are used as a common contact.
- a contact provided between a columnar semiconductor layer of the first MOS transistor and a columnar semiconductor layer of the second MOS transistor, and a contact with respect to the gate of the first MOS transistor or the second MOS transistor Is a common contact.
- the step of forming the conductive film on the side surface of the columnar semiconductor layer with a desired length and forming the gate electrode includes forming a second insulating film on the conductive film so that the columnar semiconductor layer is buried. Forming, flattening the upper surface of the second insulating film, removing the first insulating film, the conductive film, and the second insulating film anisotropically, and forming a side surface of the columnar semiconductor layer Forming a gate electrode by forming the conductive film to a desired length.
- a step of forming a planar semiconductor layer on the insulating film on the substrate, a plurality of columnar semiconductor layers on the planar semiconductor layer, and a stopper film on the plurality of columnar semiconductor layers Separating the planar semiconductor layer into elements, forming an impurity region in the planar semiconductor layer, then forming a first insulating film on at least a part of the surface, and Forming a conductive film on the insulating film; forming a second insulating film on the conductive film so as to bury the columnar semiconductor layer; and then performing CMP using the stopper film as a stopper by CMP.
- a step of planarizing, the first insulating film, the second insulating film, and the conductive film are anisotropically removed, and the first insulating film and the second insulating film on a side surface of the columnar semiconductor layer And forming the conductive film to a desired length, Forming an electrode; removing the second insulating film; selectively removing the conductive film and the first insulating film; and forming a gate electrode and a gate wiring extending from the gate electrode to the substrate side
- a plurality of MOS transistors corresponding to each of the columnar semiconductor layers at least a part of the surface of the impurity region formed in the planar semiconductor layer of the first MOS transistor and the planar semiconductor layer of the second MOS transistor are formed.
- the step of selectively removing the conductive film and the first insulating film and forming a gate electrode and a gate wiring extending from the gate electrode to the substrate side is desired for the conductive film on a side surface of the columnar semiconductor layer.
- a step of forming a first protective film on at least a part of the surface after the step of forming the gate electrode and forming the gate electrode, removing the first protective film anisotropically, and forming the desired length Forming a first protective film sidewall having a desired film thickness on the conductive film on the side surface of the columnar semiconductor layer and the first insulating film, and forming the desired film by the first protective film sidewall.
- the conductive film and the first insulating film are selectively removed while protecting the conductive film and the first insulating film on the side surface of the columnar semiconductor layer formed to have a length, and the gate electrode and the substrate from the gate electrode are removed. Forming a gate wiring extending to the side Including the.
- Impurity region of the same conductivity type as the impurity region formed in the planar semiconductor layer And forming at least part of the surface of the impurity region formed in the planar semiconductor layer of the first MOS transistor among the plurality of MOS transistors corresponding to each of the plurality of columnar semiconductor layers and the second And a step of forming a silicide layer that connects at least a part of the surface of the impurity region formed in the planar semiconductor layer of the MOS transistor.
- the upper surface of the conductive film is a step of flattening.
- a step of forming a planar semiconductor layer, a plurality of columnar semiconductor layers on the planar semiconductor layer, and a stopper film on the plurality of columnar semiconductor layers on an insulating film on the substrate Separating the planar semiconductor layer into elements, forming an impurity region in the planar semiconductor layer, then forming a first insulating film on at least a portion of the surface, and A step of forming a conductive film on the insulating film so that the columnar semiconductor layer is buried; a step of planarizing the upper surface by CMP using the stopper film as a stopper; and the first insulating film and the conductive film Forming the first insulating film and the conductive film at a desired height, and selectively removing the conductive film and the first insulating film to form an integrated gate.
- Forming an electrode and a gate wiring Forming an impurity region of the same conductivity type as the impurity region formed in the planar semiconductor layer below each of the columnar semiconductor layers on each of the columnar semiconductor layers; and each of the plurality of columnar semiconductor layers Of at least a part of the surface of the impurity region formed in the planar semiconductor layer of the first MOS transistor and the impurity region formed in the planar semiconductor layer of the second MOS transistor. And a step of forming a silicide layer connecting at least a part of the surface.
- a method of manufacturing a semiconductor device is provided.
- the step of selectively removing the conductive film and the first insulating film to form an integrated gate electrode and gate wiring includes the step of forming a first protective film on the surface, and the first The first protective film sidewall having a desired film thickness is formed on the conductive film on the side surface of the columnar semiconductor layer formed to have the desired length and the first insulating film.
- Forming the integrated gate electrode and gate wiring by selectively removing the conductive film and the first insulating film, and protecting the first protective film sidewall to form the integrated film. Forming at least a part of the gate electrode and the gate wiring having the desired film thickness.
- the insulating film and the conductive film are anisotropically removed, the conductive film on the side surface of the columnar semiconductor layer is formed to a desired length, and a gate electrode is formed; and the conductive film, the first An insulating film and the third insulating film are selectively removed, and the gate electrode and Forming a gate wiring extending from the gate electrode to the substrate side, and having the same conductivity type as the impurity region formed in the planar semiconductor layer under each of the columnar semiconductor layers on each of the columnar semiconductor layers;
- the step of forming a third insulating film on the planar semiconductor layer and the insulating film on the substrate to a height near a lower end of the gate electrode formed on the side wall of the columnar semiconductor layer is performed by insulating the substrate on the substrate. Forming a third insulating film on the film and the planar semiconductor layer so that the columnar semiconductor layer is buried; planarizing an upper surface of the third insulating film; and the third insulating film. And forming a third insulating film at a height near the lower end of the gate electrode formed on the side wall of the columnar semiconductor layer.
- the step of anisotropically removing the first insulating film and the conductive film, forming the conductive film on a side surface of the columnar semiconductor layer to a desired length, and forming a gate electrode includes the conductive film A step of forming a second insulating film on the columnar semiconductor layer so as to be buried; a step of planarizing an upper surface of the second insulating film; and the first insulating film and the second insulating film. And removing the conductive film anisotropically, forming the conductive film on the side surface of the columnar semiconductor layer to a desired length, and forming a gate electrode.
- a step of forming a planar semiconductor layer, a plurality of columnar semiconductor layers on the planar semiconductor layer, and a stopper film on the plurality of columnar semiconductor layers on an insulating film on the substrate Separating the planar semiconductor layer into elements; forming an impurity region in the planar semiconductor layer; and so as to bury the columnar semiconductor layer on the insulating film on the substrate and the planar semiconductor layer.
- Forming a third insulating film on the substrate planarizing the upper surface by CMP using the stopper film as a stopper, removing the third insulating film anisotropically, and removing the third insulating film into the columnar shape.
- the step of selectively removing the conductive film and the first insulating film and forming a gate electrode and a gate wiring extending from the gate electrode to the substrate side is desired for the conductive film on a side surface of the columnar semiconductor layer.
- a step of forming a first protective film on at least a part of the surface after the step of forming the gate electrode and forming the gate electrode, removing the first protective film anisotropically, and forming the desired length Forming a first protective film sidewall having a desired film thickness on the conductive film on the side surface of the columnar semiconductor layer and the first insulating film, and forming the desired film by the first protective film sidewall.
- the conductive film, the first insulating film, and the third insulating film are selectively removed while protecting the conductive film and the first insulating film on the side surface of the columnar semiconductor layer formed to a length of Electrode and gate extending from the gate electrode to the substrate side And forming a line.
- the step of forming a third insulating film on the planar semiconductor layer and the insulating film on the substrate to a height near a lower end of the gate electrode formed on the side wall of the columnar semiconductor layer is performed by insulating the substrate on the substrate. Forming a third insulating film on the film and the planar semiconductor layer so that the columnar semiconductor layer is buried; planarizing an upper surface of the third insulating film; and the third insulating film. And forming a third insulating film at a height near the lower end of the gate electrode formed on the side wall of the columnar semiconductor layer.
- the upper surface of the conductive film is a step of flattening.
- a step of forming a planar semiconductor layer, a plurality of columnar semiconductor layers on the planar semiconductor layer, and a stopper film on the plurality of columnar semiconductor layers on an insulating film on the substrate Separating the planar semiconductor layer into elements; forming an impurity region in the planar semiconductor layer; and so as to bury the columnar semiconductor layer on the insulating film on the substrate and the planar semiconductor layer.
- Forming a third insulating film on the substrate planarizing the upper surface by CMP using the stopper film as a stopper, removing the third insulating film anisotropically, and removing the third insulating film into the columnar shape.
- Forming and on the first insulating film A step of forming a conductive film so that the columnar semiconductor layer is buried, a step of planarizing the upper surface by CMP using the stopper film as a stopper, and anisotropy of the first insulating film and the conductive film. Forming the first insulating film and the conductive film at a desired height, and selectively removing and integrating the conductive film, the first insulating film, and the third insulating film.
- a method of manufacturing a semiconductor device which comprises a step of forming a silicide layer for connecting at least a portion of the planar semiconductor layer on the surface of the formed impurity regions of transistors.
- the step of selectively removing the conductive film and the first insulating film to form an integrated gate electrode and gate wiring includes the step of forming a first protective film on the surface, and the first The first protective film sidewall having a desired film thickness is formed on the conductive film on the side surface of the columnar semiconductor layer formed to have the desired length and the first insulating film.
- Forming the gate electrode and the gate wiring by selectively removing the conductive film, the first insulating film, and the third insulating film, and forming the first protective film sidewall A step of forming at least a part of the integrated gate electrode and gate wiring in the desired film thickness.
- a step of forming a planar semiconductor layer and a plurality of columnar semiconductor layers on the planar semiconductor layer on an insulating film on the substrate and a step of separating the planar semiconductor layer into elements.
- a step of forming an impurity region in the planar semiconductor layer, a step of forming a first insulating film on at least a part of the surface, and a step of forming a thin conductive film on the first insulating film A step of forming a polysilicon layer on the thin conductive film so that the columnar semiconductor layer is buried; removing the first insulating film, the thin conductive film and the polysilicon layer anisotropically; A step of forming the first insulating film, the thin conductive film and the polysilicon layer in a desired length; and the gate electrode integrated by selectively removing the first insulating film, the thin conductive film and the polysilicon layer And forming the gate wiring, and the columnar semiconductor Forming an impurity region of the same conductivity type as the impurity region formed in the planar semiconductor layer under each of the columnar semiconductor layers on each of the columnar semiconductor layers, and corresponding to each of the plurality of columnar semiconductor layers Of the plurality of MOS transistors, at least a
- the processing step further includes a step of planarizing the upper surface of the polysilicon layer.
- a thirteenth aspect of the present invention is the step of forming a planar semiconductor layer, a plurality of columnar semiconductor layers on the planar semiconductor layer, and a stopper film on the plurality of columnar semiconductor layers on an insulating film on the substrate; Separating the planar semiconductor layer into elements, forming an impurity region in the planar semiconductor layer, then forming a first insulating film on at least a portion of the surface, and A step of forming a thin conductive film on the insulating film, a step of forming a polysilicon layer on the thin conductive film so that the columnar semiconductor layer is buried, and then a top surface by CMP using the stopper film as a stopper.
- a flattening step and the first insulating film, the thin conductive film, and the polysilicon layer are anisotropically removed, and the first insulating film, the thin conductive film, and the polysilicon layer are formed to have a desired length.
- a step of forming an impurity region of the same conductivity type as the impurity region formed in the semiconductor layer, and a planar semiconductor layer of the first MOS transistor among the plurality of MOS transistors corresponding to each of the plurality of columnar semiconductor layers Forming a silicide layer that connects at least a part of the surface of the impurity region formed in the step and at least a part of the surface of the impurity region formed in the planar semiconductor layer of the second MOS transistor.
- a feature of the present invention is to provide a method for manufacturing a semiconductor device.
- the step of selectively removing the first insulating film, the thin conductive film and the polysilicon layer and forming an integrated gate electrode and gate wiring is a step of forming a first protective film on the surface. And removing the first protective film anisotropically, and forming a desired film on the side of the columnar semiconductor layer formed in the desired length on the first insulating film, thin conductive film, and polysilicon layer Forming a thick first protective film sidewall, selectively removing the first insulating film, thin conductive film and polysilicon layer to form an integrated gate electrode and gate wiring; Forming at least a part of the integrated gate electrode and gate wiring to the desired film thickness by protecting one protective film sidewall.
- a step of forming a planar semiconductor layer and a plurality of columnar semiconductor layers on the planar semiconductor layer on an insulating film on a substrate, and a step of separating the planar semiconductor layer into elements A step of forming an impurity region in the planar semiconductor layer; and a third region up to a height near a lower end of the gate electrode formed on the sidewall of the columnar semiconductor layer on the planar semiconductor layer and the insulating film on the substrate.
- a step of forming, a step of selectively removing the third insulating film, the first insulating film, the thin conductive film and the polysilicon layer to form an integrated gate electrode and gate wiring, and the columnar semiconductor Forming an impurity region of the same conductivity type as the impurity region formed in the planar semiconductor layer under each of the columnar semiconductor layers on each of the columnar semiconductor layers, and corresponding to each of the plurality of columnar semiconductor layers Of the plurality of MOS transistors, at least a part of the surface of the impurity region formed in the planar semiconductor layer
- the step of forming a third insulating film on the planar semiconductor layer and the insulating film on the substrate to a height near a lower end of the gate electrode formed on the side wall of the columnar semiconductor layer is performed by insulating the substrate on the substrate. Forming a third insulating film on the film and the planar semiconductor layer so that the columnar semiconductor layer is buried; planarizing an upper surface of the third insulating film; and the third insulating film. And forming a third insulating film at a height near the lower end of the gate electrode formed on the side wall of the columnar semiconductor layer.
- the processing step further includes a step of planarizing the upper surface of the polysilicon layer.
- a step of forming a planar semiconductor layer, a plurality of columnar semiconductor layers on the planar semiconductor layer, and a stopper film on the plurality of columnar semiconductor layers on an insulating film on the substrate Separating the planar semiconductor layer into elements; forming an impurity region in the planar semiconductor layer; and so as to bury the columnar semiconductor layer on the insulating film on the substrate and the planar semiconductor layer.
- Forming a third insulating film on the substrate planarizing the upper surface by CMP using the stopper film as a stopper, removing the third insulating film anisotropically, and removing the third insulating film into the columnar shape.
- the step of selectively removing the first insulating film, the thin conductive film and the polysilicon layer to form an integrated gate electrode and gate wiring includes a step of forming a first protective film on the surface.
- the first protective film is anisotropically removed, and the desired film thickness is formed on the first insulating film, the thin conductive film, and the polysilicon layer on the side surface of the columnar semiconductor layer formed to the desired length.
- Forming the first protective film sidewall, and selectively removing the third insulating film, the first insulating film, the thin conductive film and the polysilicon layer, and integrating the gate electrode and the gate wiring And forming at least a part of the integrated gate electrode and gate wiring to the desired film thickness by protecting the first protective film sidewall.
- the method further includes a step of forming a silicide layer on a surface of the impurity region formed on each of the columnar semiconductor layers.
- the anisotropic removal is etch back.
- the method further includes a step of forming a silicide layer on the surface of the impurity region formed on the upper surface of the columnar semiconductor layer.
- the size of the silicide layer formed on the surface of the impurity region formed on the upper surface of the columnar semiconductor layer is larger than the size of the upper surface of the columnar semiconductor layer.
- the method further includes a step of forming a contact on the upper surface of the impurity region formed on the upper surface of the columnar semiconductor layer, and the size of the upper surface of the impurity region formed on the upper surface of the columnar semiconductor is It is larger than the size of the bottom surface, and the size of the bottom surface of the contact is larger than the size of the upper surface of the columnar semiconductor layer in which the impurity region is formed on the upper surface.
- the gate electrode and the columnar semiconductor layer are larger than the upper surfaces.
- the method further includes forming a fourth insulating film for isolating the impurity regions.
- the step of forming a fourth insulating film for separating an impurity region larger than the upper surface of the gate electrode and the columnar semiconductor layer includes a step of forming a silicon nitride film on the surface, and the silicon nitride film, The columnar semiconductor layer is removed anisotropically so that the silicon nitride film above the gate electrode is present in a predetermined thickness and the upper surface of the region serving as the source diffusion region and the surface of the drain diffusion region are exposed. And a step of covering the side wall and the gate wall surface with the silicon nitride film.
- the method further includes a step of forming a silicide layer on the surface of the impurity region formed on the upper surface of the columnar semiconductor layer.
- an impurity region is integrally formed on the upper surface of the plurality of columnar semiconductor layers constituting the same conductivity type MOS transistor.
- the step of forming an impurity region larger than the upper surface of the columnar semiconductor layer on the upper surface of at least one of the plurality of columnar semiconductor layers uses epitaxial growth.
- the epitaxial silicon layer is used as the impurity region
- the impurity region larger than the upper surface of the columnar semiconductor layer is p-type
- the impurity region An epitaxial germanium layer is formed as a region.
- an impurity region is integrally formed on the upper surface of the plurality of columnar semiconductor layers constituting the same conductivity type MOS transistor.
- the plurality of the plurality of columnar semiconductor layers constituting the same conductivity type MOS transistors adjacent to each other at a predetermined interval or less are arranged in a self-aligned manner.
- An impurity region is integrally formed on the upper surface of the columnar semiconductor layer.
- the silicide layer has a planar semiconductor layer surface including an impurity region formed in the planar semiconductor layer of the first MOS transistor and an impurity region formed in the planar semiconductor layer of the second MOS transistor. It is formed on the entire surface.
- the step of forming an impurity region in the planar semiconductor layer is a step of selectively forming a first conductivity type impurity region and a second conductivity type impurity region in the planar semiconductor layer.
- a desired film thickness can be formed in a self-aligned manner around the periphery of the substrate.
- a silicide layer is formed above the planar semiconductor layer.
- a stable silicide layer can be formed. This silicide layer can reduce the resistance that increases with miniaturization.
- the diffusion layers of different conductivity types can be directly connected by the silicide layer, so that the transistors can be arranged close to each other, such as an inverter than the conventional SGT. The area occupied by the circuit can be significantly reduced.
- the resistance that increases with miniaturization can be reduced by the silicide layer, it is not always necessary to dispose the transistor closest to the transistor, increasing the degree of freedom in circuit design. Furthermore, the parasitic capacitance of the drain or source diffusion layer is reduced by using the substrate in which the insulating film is formed on the substrate.
- the gate electrodes can be formed in a desired thickness around the columnar silicon layers in a self-aligned manner, so that the columnar silicon layers having different gate electrodes can be densely arranged.
- the area occupied by the circuit can be reduced.
- a process having a sufficient process margin for forming the gate wiring can be constructed, it becomes easy to form the gate wiring which has been a problem in the SGT.
- a semiconductor device including a circuit formed by a transistor and a manufacturing method thereof a semiconductor device including an inverter having a simple circuit configuration and a manufacturing method thereof will be described as an example for simplicity. It will be apparent to those skilled in the art that can be applied to a semiconductor device including a circuit formed by any other transistor and a manufacturing method thereof.
- FIG. 1 is an equivalent circuit of a CMOS inverter using the present invention.
- the circuit operation of the CMOS inverter will be described below.
- the input signal Vin1 is applied to the gates of both NMOS Qn11 and PMOS Qp11 and Qp12.
- Vin1 is “1”
- NMOS Qn11 is in the ON state
- PMOS Qp11 and Qp12 are in the OFF state
- Vout1 is “0”.
- Vin1 is “0”
- NMOS Qn11 is in the OFF state
- PMOSs Qp11 and Qp12 are in the ON state
- Vout1 is “1”.
- the CMOS inverter operates so that the signal Vout1 as the output value takes the opposite value to the signal Vin1 as the input value.
- FIG. 2 is a plan view of a CMOS inverter using the present invention.
- 3A and 3B are cross-sectional views taken along cut lines AA ′ and BB ′ in FIG. The present invention will be described with reference to FIGS.
- a planar silicon layer 2 is formed on the buried oxide film layer 1, and the planar silicon layer 2 includes an N + drain diffusion layer 3 and a P + drain diffusion layer 4, and a boundary between the N + drain diffusion layer 3 and the P + drain diffusion layer 4.
- a silicide layer for directly connecting the N + drain diffusion layer 3 and the P + drain diffusion layer 4 to each other is formed on the surface in the vicinity.
- NMOS transistor Qn11 is formed by the columnar silicon layer 5 formed in the N + drain diffusion layer 3
- PMOS transistors Qp11 and Qp12 are formed by the columnar silicon layers (6a, 6b) formed in the P + drain diffusion layer 4.
- a gate insulating film 7 is formed by a high-k film such as HfO2 so as to surround the columnar silicon layers (5, 6a, 6b), and a gate electrode (8, 8a, 6) is formed by a metal film such as TaN or TiN so as to surround it. 8b) is formed.
- An N + source diffusion layer 9 is formed above the columnar silicon layer 5 forming the NMOS, and a P + source diffusion layer (10a, 10b) is formed above the columnar silicon layer (6a, 6b) forming the PMOS.
- a silicon nitride film 13 is formed as a contact stopper so as to cover these elements.
- an interlayer silicon oxide film 14 is formed on the silicon nitride film 13, and contacts (15 are provided so as to penetrate the planarized silicon oxide film 14. 16, 16a, 16b, 17a, 17b).
- contacts are provided so as to penetrate the planarized silicon oxide film 14. 16, 16a, 16b, 17a, 17b).
- by giving stress to the silicon nitride film 13 it is possible to apply stress to the channel portion of the columnar silicon layer and improve mobility.
- by separately forming a silicon nitride film having tensile stress on the NMOS and a silicon nitride film having compressive stress on the PMOS it is possible to improve mobility in both the NMOS and the PMOS.
- the contact 15 formed at the boundary between the N + drain diffusion layer 3 and the P + drain diffusion layer 4 is connected to the output terminal Vout1 through the wiring layer, and the contact 16 formed on the upper part of the columnar silicon layer 5 forming Qn11 passes through the wiring layer.
- Contacts (16a, 16b) connected to the ground potential Vss1 and formed on top of the columnar silicon layers (6a, 6b) forming Qp11 and Qp12 are connected to the power supply potential Vcc1 through the wiring layer and surround the columnar silicon layer 5.
- the contact 17a formed on the gate wiring 8c extending from the gate electrode and the contact 17b formed on the gate wiring 8d extending from the gate electrode surrounding the columnar silicon layers (6a, 6b) are connected to the input terminal Vin1 through the wiring layer. To form an inverter.
- the channel portion of the columnar silicon layer is preferably not doped with impurities or has an impurity concentration of 1e ⁇ 17 cm ⁇ 3 or less. This is because when the impurity concentration is higher than this, the characteristic variation of the transistor due to the statistical fluctuation of the impurity increases.
- the threshold value of the transistor can be adjusted by adjusting the work function of the gate material.
- the high-k film may be a silicon oxide film or a silicon nitride film, and the metal gate electrode may be a silicided polysilicon film.
- the impurity distribution is set so that the drain diffusion layer region (3, 4) at the bottom of the columnar silicon layer is formed up to the buried oxide film layer 1, and the columnar silicon layer is completely depleted during transistor operation. It is preferable to set the dimensions and impurity concentration.
- the inside of the columnar silicon layer has a floating body structure regardless of the operating state, and the dimensions and impurities of the columnar silicon layer as described above.
- the concentration By setting the concentration, the inside of the columnar silicon layer is completely depleted during transistor operation, so that the electric field inside the columnar silicon is relaxed and mobility can be improved.
- the bottom component of the drain diffusion layer capacitance is greatly reduced, and the parasitic capacitance of the total drain diffusion layer can be reduced. it can.
- the impurity may be diffused so as to cover the bottom of the columnar silicon layer.
- the contacts (17a, 17b) to the gate on the gate wiring (8c, 8d) formed on the buried oxide film By forming the contact (17a, 17b) to the gate on the gate wiring (8c, 8d) formed on the buried oxide film, the facing area between the drain diffusion layer (3, 4) and the gate can be reduced. Therefore, the parasitic capacitance between the gate and the drain can be reduced.
- the contacts (17a, 17b) to the gate wiring (8c, 8d) are separately provided in the NMOS and the PMOS. It is formed on the buried oxide film 1.
- the contact 15 formed on the drain diffusion layer is preferably formed at the boundary between the N + diffusion layer 3 and the P + diffusion layer 4. This is because it is necessary to provide an overlap margin between the columnar silicon layer and the implantation region between the boundary between the N + diffusion layer and the P + diffusion layer and the columnar silicon layer (5, 6a). This is because this space can be used effectively by forming a contact on the boundary. For this reason, the area occupied by the inverter circuit can be reduced.
- FIGS. An example of a manufacturing method for forming the semiconductor device of the present invention will be described below with reference to FIGS.
- (a) is a plan view
- (b) is a cross-sectional view taken along the line A-A '.
- FIG. 4 shows an SOI substrate in which an SOI layer 2 a not doped with impurities is formed on the buried oxide film 1.
- a silicon nitride film 18 having a thickness of about 50 to 100 nm is formed on the SOI layer 2a.
- the nitride film 18 and the SOI layer 2a are etched by reactive ion etching to form columnar silicon layers (5, 6a, 6b).
- the diameter of the columnar silicon layer is about 10 to 50 nm and the height is about 50 to 200 nm.
- the planar silicon layer 2 is formed with a thickness of about 10 to 100 nm below the columnar silicon layer.
- the planar silicon layer 2 is etched and separated by reactive ion etching using a resist mask or a multilayer resist as a mask.
- element isolation can be formed simply by separating the planar silicon layer, so that the number of steps is small and a narrow element isolation width can be formed with a minimum processing dimension.
- the columnar silicon layer is sacrificial oxidized to planarize the columnar silicon layer surface that becomes the channel portion.
- the sacrificial oxide film 19 can also be used as a through oxide film at the time of impurity implantation.
- an N + drain diffusion layer 3 is formed by introducing impurities such as As and P into the planar silicon layer 2 by ion implantation or the like using the resist mask 20.
- the nitride film 18 above the columnar silicon layer is used as a stopper for preventing impurity implantation into the columnar silicon layer.
- impurities such as B and BF2 are similarly introduced to form the P + drain diffusion layer 4.
- the film thickness of the planar silicon layer 2, impurity implantation conditions, and heat treatment conditions are set so that the impurities diffuse to the buried oxide film 1.
- the sacrificial oxide film 19 is removed to expose the silicon surface.
- a high-k film 7 such as HfO2 is formed as a gate insulating film with a thickness of about 1 to 5 nm by CVD or ALD.
- a gate conductive film 80 such as TiN or TaN is formed as a gate conductive film with a thickness of about 10 to 60 nm.
- a silicon oxide film 21 is formed and buried between the columnar silicon layers.
- the silicon oxide film 21, the gate conductive film on the columnar silicon layer, and the high-k film are polished by CMP to flatten the gate upper surface.
- CMP planarizing the upper portion of the gate by CMP, a favorable gate shape can be realized, and variations in gate length can be suppressed.
- the nitride film 18 above the columnar silicon layer is used as a CMP stopper.
- the CMP polishing amount can be controlled with good reproducibility.
- other films can be used as the CMP stopper film as long as they function as a CMP stopper film. Such a film is formed on the SOI layer 2a in advance. It can also be filmed.
- the gate conductive film 80 and the silicon oxide film 21 are etched back to form gate electrodes (8, 8a, 8b).
- an etching condition is used such that the gate conductive film 80 and the silicon oxide film 21 are etched at the same rate as much as possible and a high selection ratio is obtained with respect to the nitride film 18.
- a silicon nitride film 22 is formed.
- the silicon nitride film 22 is etched back to form silicon nitride film sidewalls 23 on the metal gate.
- the silicon nitride film formation amount and the etch back amount are set so that the silicon nitride film side wall 23 remaining on the gate just covers the gate. Since the gate covered with the nitride film sidewall is protected during etching, the gate electrode can be formed in a self-aligned manner with a desired film thickness, and the occupied area can be reduced and the parasitic capacitance between the gate and the diffusion layer can be reduced. Can be reduced.
- the silicon nitride film is used as the protective film for the sidewall, but other than this, as long as the protective film functions as the protective film for the sidewall, for example, a silicon oxide film is used. Can also be used.
- a resist or a multilayer resist is applied, and a gate wiring pattern is formed by the resist 24 by lithography.
- the gate bottom and the high-k film under the gate are etched by reactive ion etching using a resist mask.
- gate wirings (8c, 8d) are formed.
- a silicon nitride film which is a hard mask
- the process of planarizing the upper surface of the gate by CMP, etching for determining the gate length, and gate electrode protection By sequentially performing the formation of the nitride film sidewalls, the patterning of the gate wiring, and the etching for forming the gate wiring, it is possible to form a gate with a good gate shape and small dimensional variation. It can be freely formed.
- the film thickness of the gate electrode can be controlled in a self-aligned manner, the occupied area can be reduced and the parasitic resistance between the gate and the diffusion layer can be reduced.
- the silicon nitride film 18 and the nitride film sidewalls 23 on the columnar silicon are removed by wet processing.
- a silicon nitride film 25 is formed to a thickness of about 10 to 50 nm.
- the nitride film 25 is etched back to expose the upper surface of the source diffusion layer region (9, 10a, 10b) and the surface of the drain diffusion layer region (3, 4), and the sidewall of the columnar silicon layer.
- the gate sidewall is covered with the nitride film 25.
- the High-k film 7 is covered with the nitride film 25, so that damage to the High-k film 7 in a subsequent process due to wet treatment or damage due to impurity implantation can be prevented.
- the nitride film is too thin, damage to the high-k film 7 cannot be completely prevented, and if it is too thick, the occupied area increases by the film thickness formed on the gate sidewall.
- a silicon nitride film is used as the protective film.
- a film having a laminated structure of a silicon nitride film and a silicon oxide film is used. You can also.
- N + source diffusion layer 9 is formed on the top of the columnar silicon layer 5 by ion implantation or the like.
- P + source diffusion layers (10a, 10b) are similarly formed on top of the columnar silicon layers (6a, 6b).
- a silicon oxide film 30 is formed to a thickness of about 10 to 50 nm for protecting a portion that is not silicided.
- the resist 40 is patterned by lithography to form a groove pattern in the boundary region between the N + diffusion layer and the P + diffusion layer that form silicide.
- the silicon oxide film 30 at the bottom of the groove formed by resist is etched to expose the surface of the drain diffusion layer.
- a metal film such as Ni or Co is sputtered, and heat treatment is performed to silicide the portion from which the oxide film has been removed, and the unreacted metal film is removed to remove the N + diffusion layer.
- a silicide layer 11 near the boundary of the P + diffusion layer is formed.
- the oxide film 30 covering the surface is removed by wet etching.
- a liner silicon nitride film 13 is formed, then a silicon oxide film 14 is formed, and the silicon oxide film 14 is planarized by CMP.
- the liner nitride film 13 is used as an etching stopper during contact formation.
- contacts (15, 16, 16a, 16b, 17a, 17b) are formed on the source diffusion layer on the planar silicon layer, the gate, and the drain diffusion layer above the columnar silicon layer.
- the vicinity of the boundary between the N + diffusion layer and the P + diffusion layer is silicided. Since a silicide layer such as a TiSi layer in which Ti and Si, which are part of the barrier metal, are formed, a contact is always formed on the boundary between the N + diffusion layer and the P + diffusion layer. Since the N + diffusion layer and the P + diffusion layer on the planar silicon layer 2 can be directly connected by the formed silicide layer, the silicide layer 11 need not be formed.
- the gate electrodes can be formed in a desired thickness around the columnar silicon layers in a self-aligned manner, it becomes possible to densely arrange the columnar silicon layers having different gate electrodes. The area occupied by the circuit can be reduced. In addition, since a process having a sufficient process margin for forming the gate wiring can be constructed, it becomes easy to form the gate wiring which has been a problem in the SGT.
- the output potential Vout1 is formed on the substrate side as in the conventional case of FIGS. 128 (c) and (d), but element isolation is formed in the circuit. Since this is not necessary, the area occupied by the circuit can be reduced. Further, in FIGS. 128 (c) and (d) of the conventional example, it is difficult to stably manufacture due to the heat resistance of the silicide, but in this embodiment, the silicide layer 11 is formed after the transistor is formed. Is formed on the planar silicon layer 2 so that the N + diffusion layer 3 and the P + diffusion layer 4 are connected, so that there is no problem regarding the heat resistance of the silicide.
- the element isolation is formed by etching the planar silicon layer 2 and isolating it on the buried oxide film layer 1, so that the element isolation with the minimum processing dimension width determined by lithography can be easily performed. Can be formed. Therefore, when the SGT structure of the present invention is used, the circuits can be arranged at intervals of the minimum dimension, so that the effect of reducing the chip area is great.
- the silicide layer is formed on the drain diffusion layer formed in the planar silicon layer, and the resistance of the drain diffusion layer is reduced, so that the influence of the parasitic resistance due to the drain diffusion layer is reduced. . For this reason, it is possible to reduce the number of contacts on the drain diffusion layer, use the drain diffusion layer as a wiring layer, etc., and increase the degree of freedom in layout design.
- the planar silicon layer 2 When the planar silicon layer 2 is too thick, a step with the buried oxide film layer 1 at the end of the planar silicon layer 2 becomes large when the gate wiring is etched, and the gate wiring is etched into a desired shape and size. It becomes difficult. Therefore, it is desirable that the thickness of the planar silicon layer 2 be as small as possible.
- the silicide layer 11 on the drain diffusion layer does not reach the bottom of the planar silicon layer 2. This is because the resistance at the interface between the drain diffusion layer (3, 4) and the silicide layer 11 is one of the main factors of the source-drain parasitic resistance, and therefore the area of the interface between the drain diffusion layer and the silicide layer is made as large as possible. is there.
- the planar silicon layer 2 is preferably thinner than 100 nm.
- the gate processing is performed while ensuring the interface area between the silicide and the diffusion layer.
- the thickness of the planar silicon layer 2 is more preferably 20 to 40 nm.
- the thickness of the silicide layer 11 is about 10 nm to 30 nm, but in order to ensure the interface area between the drain diffusion layer and the silicide layer, it is preferably 10 nm to 20 nm.
- the film thickness of the gate electrode and the wiring is preferably as small as possible in order to reduce the occupied area of the SGT integrated circuit.
- the thickness of the gate wiring is preferably about 10 nm to 50 nm, and more preferably 10 nm to 30 nm in order to form a high density SGT integrated circuit.
- the silicide layer 11 on the drain diffusion layer does not reach the bottom of the planar silicon layer 2, but in the patterning at the time of gate wiring exposure and at the stepped part at the time of subsequent gate wiring etching.
- the thickness of the planar silicon layer is made as small as possible (preferably about 10 to 30 nm), and the silicide layer 211 is buried and oxidized.
- a structure in which a film is formed can also be used.
- a CMOS inverter is configured by SGT having a structure in which a silicide layer is formed on the entire surface of a drain diffusion layer formed in a planar silicon layer and a source diffusion layer above a columnar silicon layer.
- SGT SGT having a structure in which a silicide layer is formed on the entire surface of a drain diffusion layer formed in a planar silicon layer and a source diffusion layer above a columnar silicon layer.
- FIG. 32 is an equivalent circuit of a CMOS inverter using the present invention.
- the circuit operation of the CMOS inverter will be described below.
- the input signal Vin2 is applied to the gates of both NMOS Qn21 and PMOS Qp21 and Qp22.
- Vin2 is “1”
- NMOS Qn21 is in the ON state
- PMOSs Qp21 and Qp22 are in the OFF state
- Vout2 is “0”.
- Vin2 is “0”
- NMOS Qn21 is in the OFF state
- PMOSs Qp21 and Qp22 are in the ON state
- Vout2 is “1”.
- the CMOS inverter operates so that the signal Vout2 as the output value takes the opposite value to the signal Vin2 as the input value.
- FIG. 33 is a plan view of a CMOS inverter using the present invention.
- 34A and 34B are cross-sectional views taken along cut lines A-A 'and B-B' in FIG. The present invention will be described with reference to FIGS. 33 and 34.
- FIG. 33 is a plan view of a CMOS inverter using the present invention.
- 34A and 34B are cross-sectional views taken along cut lines A-A 'and B-B' in FIG. The present invention will be described with reference to FIGS. 33 and 34.
- a planar silicon layer 102 is formed on the buried oxide film layer 101, and the planar silicon layer 102 includes an N + drain diffusion layer 103 and a P + drain diffusion layer 104.
- the surfaces of the N + drain diffusion layer 103 and the P + drain diffusion layer 104 A silicide layer 111 is formed in order to reduce the resistance of the drain diffusion layer, and the N + drain diffusion layer 103 and the P + drain diffusion layer 104 are directly connected to each other by the silicide layer 111. This eliminates the need for contacts and element isolation for connecting the N + drain diffusion layer 103 and the P + drain diffusion layer 104, thereby reducing the area occupied by the inverter.
- An NMOS transistor Qn21 is formed by the columnar silicon layer 105 formed in the N + drain diffusion layer 103, and PMOS transistors Qp21 and Qp22 are formed by the columnar silicon layers (106a, 106b) formed in the P + drain diffusion layer 104.
- a gate insulating film 107 is formed of a high-k film such as HfO2 so as to surround the columnar silicon layer (105, 106a, 106b), and a gate electrode (108, 108a, 106) is formed of a metal film such as TaN or TiN so as to surround it. 108b) is formed.
- N + source diffusion layer 109 is formed above the columnar silicon layer 105 forming the NMOS, and a P + source diffusion layer (110a, 110b) is formed above the columnar silicon layer (106a, 106b) forming the PMOS. 109, 110a, 110b), a silicide film 112 is formed.
- a silicon nitride film 113 is formed as a contact stopper so as to cover these elements, an interlayer silicon oxide film 114 is further formed on the silicon nitride film 113, and a contact (115 is formed so as to penetrate the planarized silicon oxide film 114. 116, 116a, 116b, 117a, 117b).
- stress can be applied to the channel portion of the columnar silicon layer, and mobility can be improved.
- silicon nitride film having tensile stress on the NMOS and a silicon nitride film having compressive stress on the PMOS it is possible to improve mobility in both the NMOS and the PMOS.
- the contact 115 formed at the boundary between the N + drain diffusion layer 103 and the P + drain diffusion layer 104 is connected to the output terminal Vout2 through the wiring layer, and the contact 116 formed on the columnar silicon layer 105 forming the Qn21 is passed through the wiring layer.
- Contacts (116a, 116b) connected to the ground potential Vss2 and formed on the top of the columnar silicon layers (106a, 106b) forming Qp21 and Qp22 are connected to the power supply potential Vcc2 through the wiring layer and surround the columnar silicon layer 105.
- a contact 117a formed on the gate wiring 108c extending from the gate electrode and a contact 117b formed on the gate wiring 108d extending from the gate electrode surrounding the columnar silicon layers (106a, 106b) are connected to the input terminal Vin2 through the wiring layer. Forming the inverter by connecting.
- the channel portion of the columnar silicon layer is preferably not doped with impurities or has an impurity concentration of 1e ⁇ 17 cm ⁇ 3 or less. This is because when the impurity concentration is higher than this, the characteristic variation of the transistor due to the statistical fluctuation of the impurity increases.
- the threshold value of the transistor can be adjusted by adjusting the work function of the gate material.
- the high-k film may be a silicon oxide film or a silicon nitride film, and the metal gate electrode may be a silicided polysilicon film.
- the impurity distribution is set so that the drain diffusion layer region (103, 104) at the bottom of the columnar silicon layer is formed up to the buried oxide film layer 101, and the columnar silicon layer is completely depleted during the transistor operation. It is preferable to set the dimensions and impurity concentration.
- the impurity distribution in the drain diffusion layer regions (103, 104) as described above, the inside of the columnar silicon layer has a floating body structure regardless of the operation state, and the dimensions of the columnar silicon layer as described above
- the impurity concentration the columnar silicon layer is completely depleted during transistor operation, so that the electric field in the columnar silicon is relaxed and mobility can be improved.
- the bottom component of the drain diffusion layer capacitance can be greatly reduced, and the parasitic capacitance of the total drain diffusion layer can be reduced. it can.
- the impurity may be diffused so as to cover the bottom of the columnar silicon layer.
- the facing area between the drain diffusion layer (103, 104) and the gate can be reduced. Therefore, the parasitic capacitance between the gate and the drain can be reduced.
- contacts (117a, 117b) to the gate wiring (108c, 108d) are separately provided in the NMOS and the PMOS. It is formed on the buried oxide film 101.
- the contact 115 formed on the drain diffusion layer is preferably formed at the boundary between the N + diffusion layer 103 and the P + diffusion layer 104. This is because it is necessary to provide an overlap margin between the columnar silicon layer and the implantation region between the boundary between the N + diffusion layer and the P + diffusion layer and the columnar silicon layer (105, 106a). This is because this space can be used effectively by forming a contact on the boundary. For this reason, the area occupied by the inverter circuit can be reduced.
- FIGS. In each figure, (a) is a plan view, and (b) is a cross-sectional view taken along the line A-A '.
- the process after the gate formation is the same as the manufacturing process of the first embodiment, and the process after the gate formation is described below.
- a silicon nitride film 125 is formed to a thickness of about 10 to 50 nm.
- the nitride film 125 is etched back to expose the upper surface of the source diffusion layer region (109, 110a, 110b) and the surface of the drain diffusion layer region (103, 104), and the sidewall of the columnar silicon layer.
- the gate sidewall is covered with a nitride film 125.
- the silicon nitride film forming process for protection includes the purpose of preventing excessive silicidation and preventing damage. Therefore, in order to prevent excessive silicidation of one of them, an ion implantation process described later and It can also be performed before the silicidation step of the source / drain surface.
- this silicon nitride film 125 is a silicon oxide film, it will be wet etched by hydrofluoric acid used in the cleaning / peeling process and the silicide pretreatment, so that it is a film that does not dissolve in hydrofluoric acid, such as a silicon nitride film. Preferably there is. If the nitride film is too thin, the High-k film 107 cannot be completely protected. If it is too thick, the area occupied by the film formed on the gate sidewall increases.
- a silicon nitride film is used as the protective film. However, in addition to this, as long as the protective film functions as a protective film, for example, a film having a laminated structure of a silicon nitride film and a silicon oxide film is used. You can also.
- N + source diffusion layer 109 is formed on the columnar silicon layer 105 by ion implantation or the like.
- P + source diffusion layers (110a, 110b) are formed on top of the columnar silicon layers (106a, 106b).
- the source / drain surface is silicided by sputtering a metal film such as Ni or Co, and the unreacted metal film is removed by removing the unreacted metal film (103, 104).
- the upper silicide layer 111 and the silicide layer 112 on the source diffusion layers (109, 110a, 110b) are formed.
- a liner silicon nitride film 113 is formed, then a silicon oxide film 114 is formed, and the silicon oxide film 114 is planarized by CMP. Subsequently, contacts (115, 116, 116a, 116b, 117a, 117b) are formed on the source diffusion layer on the planar silicon layer, the gate, and the drain diffusion layer above the columnar silicon layer.
- the liner nitride film 113 is used as an etching stopper during contact formation.
- the gate electrodes can be formed in a desired thickness around the columnar silicon layers in a self-aligned manner, it becomes possible to densely arrange the columnar silicon layers having different gate electrodes. The area occupied by the circuit can be reduced. In addition, since a process having a sufficient process margin for forming the gate wiring can be constructed, it becomes easy to form the gate wiring which has been a problem in the SGT.
- the silicide layer is formed on the entire surface of the drain diffusion layer formed in the planar silicon layer, and the resistance of the drain diffusion layer is significantly reduced. Becomes very small. For this reason, it is possible to reduce the number of contacts on the drain diffusion layer, use the drain diffusion layer as a wiring layer, etc., and increase the degree of freedom in layout design.
- FIG. 43 is an equivalent circuit of a CMOS inverter using the present invention. Since the circuit operation of the CMOS inverter is the same as that of the second embodiment, it is omitted here.
- FIG. 44 is a plan view of a CMOS inverter using the present invention. 45 (a) and 45 (b) are cross-sectional views taken along cut lines AA ′ and BB ′ in FIG.
- the difference from the second embodiment is that in this embodiment, the source diffusion layers on the two adjacent columnar silicon layers (306a, 306b) forming the PMOSs Qp41 and Qp42 are the same rectangular contact. It is a point connected by 316c.
- the distance between adjacent columnar silicon layers is smaller than the minimum contact size, it is difficult to form normal contacts on all the columnar silicon layers, but this method makes it easy to form contacts. it can.
- Other configurations are the same as those in the second embodiment, and are omitted here.
- FIG. 46 is a plan view of the CMOS inverter in this example.
- the gate area 408 and 408a, 408b of the NMOS Qn51 and the PMOS Qp51 and Qp52 are connected by the gate wiring 408e, and the contact to the gate is reduced, thereby reducing the area occupied by the inverter. is doing.
- the gate wiring 408e is formed on the buried oxide film 401 so that the opposing area between the gate wiring 408e and the planar silicon layer 402 is as small as possible.
- the shape of the planar silicon layer 402 is changed.
- the area occupied by the inverter is further reduced by forming the contact 467c to the gate on the gate wiring 458e.
- This embodiment relates to an SGT in which the connection to the source diffusion layer formed on the columnar silicon layer and the gate electrode is formed by the same contact, and an E-type NMOS inverter will be described as an example.
- FIG. 47 is an equivalent circuit diagram of an E-type NMOS inverter using the present invention.
- the gate and source of Q L1 which is a load NMOS are connected to each other.
- the input signal Vin6 is applied to the gate of Q D1 which is a driver NMOS.
- Vin6 is “1”
- the driver NMOS Q D1 is in the ON state and the load NMOS Q L1 is also in the ON state.
- Vout6 is “0”. become.
- Vout6 becomes "1".
- the E-type NMOS inverter operates so that the Vout6 signal as the output value takes the opposite value to the Vin6 signal as the input value.
- FIG. 48 is an example of a plan view of an E-type NMOS inverter using the present invention.
- 49A and 49B are cross-sectional views taken along the cut lines AA ′ and BB ′ in FIG. The present invention will be described with reference to FIGS. 48 and 49.
- FIG. A planar silicon layer 502 is formed on the buried oxide film layer 501, and the planar silicon layer 502 is composed of an N + drain diffusion layer 503.
- a silicide layer 511 is formed on the surface of the N + drain diffusion layer 503 in order to reduce the drain diffusion layer resistance. Is formed.
- An NMOS driving transistor Q D1 is formed by the columnar silicon layer 505 formed on the N + drain diffusion layer 503, and an NMOS load transistor Q L1 is formed by the columnar silicon layer 506 formed on the N + drain diffusion layer 503 in the same manner.
- a gate insulating film 507 is formed of a high-k film such as HfO2 so as to surround the columnar silicon layers (505, 506), and gate electrodes (508a, 508b) are formed of a metal film such as TaN or TiN.
- An N + source diffusion layer 509a is formed above the columnar silicon layer 505 that forms the driving NMOS, and an N + source diffusion layer 509b is formed above the columnar silicon layer 506 that forms the load NMOS.
- a silicide film 512 is formed on each source diffusion layer.
- a silicon nitride film 513 is formed as a contact stopper so as to cover these elements.
- an interlayer silicon oxide film 514 is formed on the silicon nitride film 513, and contacts (515) are formed so as to penetrate the planarized silicon oxide film 514. 516, 517a, 527).
- a contact 517a connected to the gate of the driving NMOS Q D1 is connected to the input terminal Vin6 through a wiring layer, and a contact 516 formed on the columnar silicon layer 505 forming the driving NMOS Q D1 is grounded through the wiring layer.
- the gate wiring 508c of Q L1 which is a load NMOS and the source diffusion layer 509b above the columnar silicon layer are connected to the power supply potential Vcc6 through the wiring layer by the same contact 527.
- the contact 515 formed in the drain N + diffusion layer 503 is connected to the output terminal Vout6, whereby an E-type NMOS inverter is formed.
- the silicide layer 511 is formed on the entire surface of the N + drain diffusion layer 503. However, the silicide layer 511 is part of the surface of the N + drain diffusion layer 503 (the drive transistor Q D1 and the load transistor Q L1 (Between).
- the same common contact 527 forms a contact with the gate wiring 508c extending from the gate electrode of Q L1 which is a load NMOS and the source diffusion layer 509b above the columnar silicon layer. For this reason, the number of contacts can be reduced, and the area of an inverter or the like can be reduced.
- the silicide layer is formed on the drain diffusion layer formed in the planar silicon layer, and the resistance of the drain diffusion layer is reduced, so that the influence of the parasitic resistance due to the drain diffusion layer is reduced. . For this reason, it is possible to reduce the number of contacts on the drain diffusion layer, use the drain diffusion layer as a wiring layer, etc., and increase the degree of freedom in layout design.
- an example of the common contact to the gate wiring and the source diffusion layer in the E-type NMOS inverter is taken, but the above-mentioned common contact is not limited to the E-type NMOS inverter, but a normal CMOS. It can also be used in a circuit using.
- This embodiment relates to an SGT in which the connection to the drain diffusion layer formed at the bottom of the columnar silicon layer and the gate electrode is formed by the same contact, and a D-type NMOS inverter will be described as an example.
- FIG. 50 is an equivalent circuit diagram of a D-type NMOS inverter using the present invention.
- the operation circuit of the D-type NMOS inverter will be described below.
- the load NMOS Q L2 is a depletion type transistor, and its drain and gate are connected to each other.
- the input signal Vin7 is applied to the gate of Q D2 which is a driver NMOS.
- Q D2 is ON state a driver NMOS, although the Q L2 is also ON state is a load NMOS, due to the high driving capability towards the Q D2 is a driver NMOS, Vout7 is "0" become.
- FIG. 51 is an example of a plan view of a D-type NMOS inverter using the present invention.
- 52A and 52B are cross-sectional views taken along cut lines AA ′ and BB ′ in FIG. The present invention will be described with reference to FIGS.
- a planar silicon layer 602 is formed on the buried oxide film layer 601, and the planar silicon layer 602 is composed of an N + drain diffusion layer 603.
- a silicide layer 611 is formed on the surface of the N + drain diffusion layer 603 in order to reduce the drain diffusion layer resistance. Is formed.
- An NMOS driving transistor Q D2 is formed by the columnar silicon layer 605 formed on the N + drain diffusion layer 603, and an NMOS load transistor Q L2 is formed by the columnar silicon layer 606 formed on the N + drain diffusion layer 603 in the same manner.
- a gate insulating film 607 is formed of a high-k film such as HfO2 so as to surround the columnar silicon layers (605, 606), and a gate electrode (608a, 608b) is formed of a metal film such as TaN or TiN so as to surround it. Has been.
- N + source diffusion layer 609a is formed above the columnar silicon layer 605 forming the driving NMOS, and an N + source diffusion layer 609b is formed above the columnar silicon layer 606 forming the load NMOS.
- a silicide film 612 is formed on each source diffusion layer.
- a silicon nitride film 613 is formed as a contact stopper so as to cover these elements.
- an interlayer silicon oxide film 614 is formed on the silicon nitride film 613, and contacts (616) are formed so as to penetrate the planarized silicon oxide film 614. , 616a, 617a, 6128).
- the contact 617a connected to the gate of the driving NMOS Q D2 is connected to the input terminal Vin7 through the wiring layer, and the contact 616 formed on the columnar silicon layer 605 forming the driving NMOS Q D2 is grounded through the wiring layer.
- the gate wiring 608c of the Q L2 that is the load NMOS and the drain diffusion layer 603 are connected to the output terminal Vout7 through the same contact 628.
- the contact 616a formed on the source N + diffusion layer 609b above the columnar silicon layer forming the load NMOS is connected to the power supply potential Vcc7, thereby forming a D-type NMOS inverter.
- the silicide layer 611 is formed on the entire surface of the N + drain diffusion layer 603, but the silicide layer 611 is part of the surface of the N + drain diffusion layer 603 (the drive transistor Q D1 and the load transistor Q L1 (Between).
- the gate wiring 608 c extending from the gate electrode of Q L2 as the load NMOS and the contact to the drain diffusion layer 603 are formed by the same common contact 628. For this reason, the number of contacts can be reduced, and the area of an inverter or the like can be reduced.
- the silicide layer is formed on the drain diffusion layer formed in the planar silicon layer, and the resistance of the drain diffusion layer is reduced, so that the influence of the parasitic resistance due to the drain diffusion layer is reduced. . For this reason, it is possible to reduce the number of contacts on the drain diffusion layer, use the drain diffusion layer as a wiring layer, etc., and increase the degree of freedom in layout design.
- the common contact to the gate wiring and the drain diffusion layer in the D-type NMOS inverter is taken, but the above-mentioned common contact is not limited to the D-type NMOS inverter, but a normal CMOS. It can also be used in a circuit using.
- FIG. 53 is an equivalent circuit of a CMOS inverter using the present invention. Since the circuit operation of the CMOS inverter is the same as that of the second embodiment, it is omitted here.
- FIG. 54 is a plan view of a CMOS inverter using the present invention.
- 55A and 55B are cross-sectional views taken along cut lines A-A 'and B-B' in FIG.
- the gate electrodes (708, 708a, 708b) surrounding the columnar silicon layer and the gate wirings (708c, 708d) extending from these gate electrodes have the same height. That is, the gate electrode and the gate wiring are integrally formed, and the entire upper surface of the integrally formed gate electrode and gate wiring is formed in a plane parallel to the substrate.
- the number of manufacturing steps in the gate forming step can be reduced, and the gate wiring can be easily formed during manufacturing.
- FIG. 54 and 55 The present invention will be described with reference to FIGS. 54 and 55.
- a planar silicon layer 702 is formed on the buried oxide film layer 701.
- the planar silicon layer 702 includes an N + drain diffusion layer 703 and a P + drain diffusion layer 704, and the surfaces of the N + drain diffusion layer 703 and the P + drain diffusion layer 704 are formed.
- a silicide layer 711 is formed in order to lower the resistance of the drain diffusion layer, and the N + drain diffusion layer 703 and the P + drain diffusion layer 704 are directly connected to each other by the silicide layer 711. This eliminates the need for contacts or element isolation for connecting the N + drain diffusion layer 703 and the P + drain diffusion layer 704, thereby reducing the area occupied by the inverter.
- An NMOS transistor Qn81 is formed by the columnar silicon layer 705 formed in the N + drain diffusion layer 703, and PMOS transistors Qp81 and Qp82 are formed by the columnar silicon layers (706a, 706b) formed in the P + drain diffusion layer 704.
- a gate insulating film 707 is formed by a high-k film such as HfO2 so as to surround the columnar silicon layers (705, 706a, 706b), and a gate electrode (708, 708a, 706) is formed by a metal film such as TaN or TiN so as to surround it. 708b) is formed.
- N + source diffusion layer 709 is formed above the columnar silicon layer 705 that forms the NMOS, and a P + source diffusion layer (710a, 710b) is formed above the columnar silicon layer (706a, 706b) that forms the PMOS. 709, 710a, 710b), a silicide film 712 is formed.
- a silicon nitride film 713 is formed as a contact stopper so as to cover these elements, and an interlayer silicon oxide film 714 is further formed on the silicon nitride film 713, and contacts (715 are formed so as to penetrate the flattened silicon oxide film 714. , 716, 716a, 716b, 717a, 717b).
- a contact 715 formed at the boundary between the N + drain diffusion layer 703 and the P + drain diffusion layer 704 is connected to the output terminal Vout8 through a wiring layer, and a contact 716 formed on the upper part of the columnar silicon layer 705 forming Qn81 passes through the wiring layer.
- Contacts (716a, 716b) connected to the ground potential Vss8 and formed on top of the columnar silicon layers (706a, 706b) forming Qp81 and Qp82 are connected to the power supply potential Vcc8 through the wiring layer and surround the columnar silicon layer 705.
- a contact 717a formed on the gate wiring 708c extending from the gate electrode and a contact 717b formed on the gate wiring 708d extending from the gate electrode surrounding the columnar silicon layers (706a, 706b) are connected to the input terminal Vin8 through the wiring layer. Forming the inverter by connecting.
- FIGS. An example of a manufacturing method for forming the semiconductor device of the present invention will be described below with reference to FIGS.
- (a) is a plan view between A and A '
- (b) is a sectional view.
- a high-k film 7 such as HfO2 is formed as a gate insulating film with a thickness of about 1 to 5 nm by CVD or ALD
- a metal such as TiN or TaN is formed as a gate conductive film.
- a film 729 is formed to a thickness of about 100 to 400 nm. In film formation, in an initial stage where coverage is required, film formation can be performed efficiently by performing film formation by CVD or ALD, and then performing film formation by sputtering at a high film formation rate. .
- the gate conductive film 729 is planarized by CMP.
- CMP is stopped at the nitride film 718 on the columnar silicon layer.
- the nitride film 718 as a CMP stopper, the CMP polishing amount can be controlled with good reproducibility.
- other films can be used as the CMP stopper film as long as they function as a CMP stopper film.
- the gate conductive film 729 is etched back to determine the gate length.
- a silicon nitride film 722 is formed.
- the silicon nitride film 722 is etched back to form a silicon nitride film sidewall 723 on the metal gate.
- a gate electrode corresponding to the thickness of the silicon nitride film side wall 723 remaining on the gate can be formed in a self-aligned manner around the columnar silicon layer.
- the film thickness and etch back amount of the silicon nitride film 723 are adjusted so that the electrode film thickness is obtained.
- the silicon nitride film is used as the protective film for the sidewall, but other than this, as long as the protective film functions as the protective film for the sidewall, for example, a silicon oxide film is used. Can also be used.
- a resist or a multilayer resist is applied, and a gate wiring pattern is formed with a resist 724 by lithography.
- gate bottom and the high-k film under the gate are etched by reactive ion etching using a resist mask.
- gate electrodes (708, 708a, 708b) and gate wirings (708c, 708d) are formed.
- the silicon nitride film 718 and the silicon nitride film sidewalls 723 on the columnar silicon are removed by wet processing.
- a silicon nitride film 725 is formed to a thickness of about 10 to 50 nm.
- the silicon nitride film 725 is etched back to expose the upper surface of the columnar silicon layer and the upper surface of the planar silicon layer, and the sidewall and gate sidewall of the upper portion of the columnar silicon layer are covered with the silicon nitride film 725.
- This structure has the following effects.
- the silicon nitride film 725 is a silicon oxide film, it is wet-etched by hydrofluoric acid used for the cleaning / peeling process and the silicide pretreatment, so that it does not dissolve in hydrofluoric acid like the silicon nitride film.
- a membrane is preferred. If the nitride film is too thin, the High-k film cannot be completely protected. If it is too thick, the occupied area increases by the film thickness formed on the gate sidewall.
- a silicon nitride film is used as the protective film.
- the protective film functions as a protective film, for example, a film having a laminated structure of a silicon nitride film and a silicon oxide film is used. You can also.
- an N + source diffusion layer 709 is formed on the columnar silicon layer 705 by ion implantation or the like.
- P + source diffusion layers (710a, 710b) are formed on top of the columnar silicon layers (706a, 706b).
- a metal film such as Ni or Co is sputtered, and the surface of the source / drain is silicided by applying heat treatment, and the unreacted metal film is removed to remove the drain diffusion layer (703, 704).
- An upper silicide layer 711 and a silicide layer 712 on the source diffusion layer (709, 710a, 710b) are formed.
- a liner silicon nitride film 713 is formed, then a silicon oxide film 714 is formed, and the silicon oxide film is planarized by CMP.
- the liner nitride film is used as an etching stopper during contact formation.
- contacts (715, 716, 716a, 716b, 717a, 717b) are formed on the source diffusion layer on the planar silicon layer, the gate, and the drain diffusion layer above the columnar silicon layer.
- the number of manufacturing steps in the gate forming step can be reduced, and the formation of the gate wiring at the time of manufacturing becomes easy.
- This embodiment shows an embodiment of SGT for reducing the parasitic capacitance between the gate electrode and the gate wiring and the drain diffusion layer at the bottom of the columnar silicon layer.
- FIG. 70 is an equivalent circuit of a CMOS inverter using the present invention. Since the circuit operation of the CMOS inverter is the same as that of the second embodiment, it is omitted here.
- FIG. 71 is a plan view of a CMOS inverter using the present invention.
- 72A and 72B are cross-sectional views taken along cut lines A-A 'and B-B' in FIG.
- This embodiment is characterized in that a silicon oxide film 820 exists between the gate electrode (808, 808a, 808b) or gate wiring (808c, 808d) and the drain diffusion layer (803, 804).
- This structure increases the thickness of the insulating film between the gate electrode or gate wiring and the drain diffusion layer, thereby reducing the parasitic capacitance between the gate and the drain diffusion layer.
- the parasitic capacitance between the gate and the drain diffusion layer increases because the relative dielectric constant of the high-k film is large. Therefore, the parasitic capacitance can be greatly reduced by inserting a silicon oxide film having a lower relative dielectric constant than the High-k film between the gate wiring and the drain diffusion layer.
- FIGS. 71 and 72 The present invention will be described with reference to FIGS. 71 and 72.
- a planar silicon layer 802 is formed on the buried oxide film layer 801.
- the planar silicon layer 802 includes an N + drain diffusion layer 803 and a P + drain diffusion layer 804, and the surfaces of the N + drain diffusion layer 803 and the P + drain diffusion layer 804 are formed.
- An NMOS transistor Qn91 is formed by the columnar silicon layer 805 formed on the N + drain diffusion layer 803, and PMOS transistors Qp91 and Qp92 are formed by the columnar silicon layers (806a, 806b) formed on the P + drain diffusion layer 804. Yes.
- a gate insulating film 807 is formed by a high-k film such as HfO2 so as to surround the columnar silicon layers (805, 806a, 806b), and a gate electrode (808, 808a, 808) is formed by a metal film such as TaN or TiN so as to surround it. 808b) is formed.
- An N + source diffusion layer 809 is formed above the columnar silicon layer 805 forming the NMOS, and a P + source diffusion layer (810a, 810b) is formed above the columnar silicon layers (806a, 806b) forming the PMOS. 809, 810a and 810b), a silicide film 812 is formed.
- a silicon nitride film 813 is formed as a contact stopper so as to cover these elements.
- an interlayer silicon oxide film 814 is formed on the silicon nitride film 813, and contacts (815 are formed so as to penetrate the planarized silicon oxide film 814.
- a contact 815 formed at the boundary between the N + drain diffusion layer 803 and the P + drain diffusion layer 804 is connected to the output terminal Vout9 through the wiring layer, and a contact 816 formed at the upper portion of the columnar silicon layer 805 forming Qn91 passes through the wiring layer.
- Contacts (816a, 816b) connected to the ground potential Vss9 and formed on top of the columnar silicon layers (806a, 806b) forming Qp91 and Qp92 are connected to the power supply potential Vcc9 through the wiring layer and surround the columnar silicon layer 805.
- a contact 817a formed on the gate wiring 808c extending from the gate electrode and a contact 817b formed on the gate wiring 808d extending from the gate electrode surrounding the columnar silicon layers (806a, 806b) are connected to the input terminal Vin9 through the wiring layer. Forming the inverter by connecting.
- FIGS. An example of a manufacturing method for forming the semiconductor device of the present invention will be described below with reference to FIGS.
- (a) is a plan view between A and A '
- (b) is a sectional view.
- the columnar silicon layer is sacrificial oxidized to planarize the columnar silicon layer surface that becomes the channel portion.
- the sacrificial oxide film 819 can also be used as a through oxide film during impurity implantation.
- impurities such as As and P are introduced by ion implantation or the like to form an N + drain diffusion layer 803, and impurities such as B and BF2 are introduced to cause P + drain diffusion.
- Layer 804 is formed.
- the nitride film 818 above the columnar silicon layer is used as a stopper for preventing impurity implantation into the columnar silicon layer.
- implantation conditions and heat treatment conditions are set so that the impurities diffuse to the buried oxide film 1 and further diffuse to the lower portion of the columnar silicon layer.
- a silicon oxide film 820 is formed with a film thickness of about 200 to 500 nm to embed columnar silicon layers.
- the silicon oxide film 820 is planarized by CMP, and CMP is stopped at the silicon nitride film 818.
- the CMP polishing amount can be controlled with good reproducibility.
- other films can be used as the CMP stopper film as long as they function as a CMP stopper film.
- the silicon oxide film 820 is etched back to expose the portion of the columnar silicon layer that becomes the channel. At this time, the silicon oxide film 820 is left on the drain diffusion layer (803, 804) by a thickness of about 5 to 50 nm.
- a High-k film 807 such as HfO 2 is formed as a gate insulating film with a thickness of about 1 to 5 nm by a CVD method or an ALD method.
- a metal film 880 such as TiN or TaN is formed as a gate conductive film with a thickness of about 10 to 60 nm. Since a silicon oxide film 820 having a relative dielectric constant lower than that of the gate insulating film 807 is inserted between the gate conductive film 880 and the drain diffusion layers (803 and 804), the parasitic capacitance between the two is reduced.
- a silicon oxide film 821 is formed and buried between the columnar silicon layers.
- the silicon oxide film 821, the gate conductive film over the columnar silicon layer, and the high-k film are polished by CMP to planarize the gate upper surface.
- CMP planarizing the upper portion of the gate by CMP, a favorable gate shape can be realized, and variations in gate length can be suppressed.
- the nitride film 818 above the columnar silicon layer is used as a CMP stopper.
- the CMP polishing amount can be controlled with good reproducibility.
- other films can be used as the CMP stopper film as long as they function as a CMP stopper film.
- the gate conductive film and the silicon oxide film 821 are etched back to form gate electrodes (808, 808a, 808b).
- the gate conductive films (808, 808a, 808b) and the silicon oxide film 821 are etched at the same rate as possible, and etching conditions are used so as to obtain a high selectivity with respect to the nitride film 818.
- etching the gate conductive film (808, 808a, 808b) and the silicon oxide film 821 at the same rate it is possible to suppress the step difference between the upper surfaces of the gate conductive film (808, 808a, 808b).
- a silicon nitride film 822 is formed.
- the silicon nitride film 822 is etched back to form a silicon nitride film sidewall 823 on the metal gate.
- the silicon nitride film deposition amount and the etch back amount are set so that the silicon nitride film sidewall 823 remaining on the gate just covers the gate. Since the gate covered with the nitride film sidewall is protected during etching, the gate electrode can be formed in a self-aligned manner with a desired film thickness, and the occupied area can be reduced and the parasitic capacitance between the gate and the diffusion layer can be reduced. Can be reduced.
- the silicon nitride film is used as the protective film for the sidewall, but other than this, as long as the protective film functions as the protective film for the sidewall, for example, a silicon oxide film is used. Can also be used.
- a resist or a multilayer resist is applied, and a gate wiring pattern is formed from the resist 824 by lithography.
- the high-k film and silicon oxide film under the gate and under the gate are etched by reactive ion etching using a resist mask.
- gate electrodes (808, 808a, 808b) and gate wirings (808c, 808d) are formed.
- the silicon nitride film 818 and the nitride film sidewalls 823 on the columnar silicon are removed by wet processing.
- a silicon nitride film 825 is formed to a thickness of about 10 to 50 nm.
- the nitride film 825 is etched back to expose the upper surface of the pillar-shaped silicon layer and the upper surface of the planar silicon layer, so that the sidewall and gate sidewalls on the pillar-shaped silicon layer are covered with the nitride film 825.
- This structure has the following effects. First, since the gate electrode (808, 808a, 808b) and the upper part of the columnar silicon layer are separated by the nitride film 825, a short circuit between the gate electrode and the upper part of the columnar silicon layer due to excessive silicide, Short circuit between the drain diffusion layers can be prevented.
- the silicon nitride film 825 is a silicon oxide film, it is wet-etched by hydrofluoric acid used for the cleaning / peeling process and the silicide pretreatment, so that it does not dissolve in hydrofluoric acid like the silicon nitride film.
- a membrane is preferred. If the nitride film is too thin, the High-k film 807 cannot be completely protected. If it is too thick, the occupied area increases by the film thickness formed on the gate sidewall.
- a silicon nitride film is used as the protective film.
- the protective film functions as a protective film, for example, a film having a laminated structure of a silicon nitride film and a silicon oxide film is used. You can also.
- an N + source diffusion layer 809 is formed on the columnar silicon layer 805 by ion implantation or the like.
- P + source diffusion layers (810a, 810b) are formed on top of the columnar silicon layers (806a, 806b).
- a metal film such as Ni or Co is sputtered, and the surface of the source / drain is silicided by applying heat treatment, and the unreacted metal film is removed to remove the silicide layer 811 on the drain diffusion layer and the source diffusion layer.
- the silicide layer 812 is formed.
- a liner silicon nitride film 813 is formed, then a silicon oxide film 814 is formed, and the silicon oxide film is planarized by CMP. Thereafter, contacts (815, 816, 816a, 816b, 817a, 817b) are formed on the source diffusion layer on the planar silicon layer, on the gate, and on the drain diffusion layer above the columnar silicon layer.
- the insulating film between the gate insulating film and the drain diffusion layer is thickened by inserting the insulating film between the gate insulating film and the drain diffusion layer.
- the parasitic capacitance between the gate and the drain diffusion layer is reduced.
- the parasitic capacitance can be greatly reduced by inserting an insulating film having a relatively low relative dielectric constant such as a silicon oxide film between the gate insulating film and the drain diffusion layer.
- This embodiment shows an embodiment in which the gate formation process in the embodiment 7 is simplified and the SGT structure for reducing the parasitic capacitance between the gate wiring and the drain diffusion layer at the bottom of the columnar silicon layer in the embodiment 8 is simultaneously performed. .
- FIG. 91 is an equivalent circuit of a CMOS inverter using the present invention. Since the circuit operation of the CMOS inverter is the same as that of the second embodiment, it is omitted here.
- FIG. 92 is a plan view of a CMOS inverter using the present invention.
- 93A and 93B are cross-sectional views taken along cut lines AA ′ and BB ′ in FIG.
- the gate electrodes (908, 908a, 908b) surrounding the columnar silicon layer and the gate wirings (908c, 908d) extending from these gate electrodes have the same height, that is, The gate electrode and the gate wiring are integrally formed, the entire upper surface of the integrally formed gate electrode and the gate wiring is formed in a plane parallel to the substrate, and the gate electrode (908, 908a, 908b) or gate An insulating film 920 such as a silicon oxide film exists between the wiring (908c, 908d) and the drain diffusion layer (903, 904).
- the CMOS inverter shown in this embodiment can be formed using a manufacturing method as described below.
- a silicon oxide film is formed so as to embed the columnar silicon layer, and then the silicon oxide film is CMP-processed. Then, the silicon oxide film is etched back to form a silicon oxide film in the drain diffusion layer by a desired film thickness.
- a gate conductive film is formed so as to embed the columnar silicon layer after the columnar silicon layer is formed.
- Silicon for planarizing the film by CMP, subsequently etching back the gate conductive film, and subsequently forming and etching back a silicon nitride film for determining the gate electrode film thickness to form the gate electrode in a self-aligned manner By forming a nitride film sidewall and subsequently performing lithography and etching of the gate wiring pattern, a gate electrode and a gate wiring extending from the gate electrode are integrally formed, and the integrally formed gate electrode and A gate electrode structure is formed in which the entire upper surface of the gate wiring is formed in a plane parallel to the substrate.
- a silicon nitride film is formed to protect the sidewalls of the columnar silicon layer, a diffusion layer is formed on the columnar silicon layer, and a silicide layer is formed on the planar silicon layer surface and the columnar silicon layer. Subsequently, a contact is formed.
- the number of manufacturing steps in the gate forming step can be reduced, and the gate wiring can be easily formed during manufacturing. Furthermore, by inserting the insulating film between the gate insulating film and the drain diffusion layer, the insulating film between the gate electrode and the gate wiring and the drain diffusion layer becomes thick, so that the parasitic capacitance between the gate and the drain diffusion layer is reduced. In particular, the parasitic capacitance can be greatly reduced by inserting an insulating film having a relatively low relative dielectric constant such as a silicon oxide film between the gate insulating film and the drain diffusion layer.
- the SGT is formed by using the same gate forming method as in the embodiment 7, but the gate structure is a laminated structure of a thin metal film on the gate insulating film side and polysilicon on the surface side. This is different from Example 7.
- FIG. 94 is an equivalent circuit of a CMOS inverter using the present invention. Since the circuit operation of the CMOS inverter is the same as that of the second embodiment, it is omitted here.
- FIG. 95 is a plan view of a CMOS inverter using the present invention.
- 96 (a) and 96 (b) are cross-sectional views taken along cut lines A-A 'and B-B' in FIG.
- the gate electrodes (1008, 1008a, 1008b) surrounding the columnar silicon layer and the gate wirings (1008c, 1008d) extending from these gate electrodes have the same height, that is, the gate electrodes
- the gate wiring is integrally formed, and the entire upper surface of the integrally formed gate electrode and gate wiring is formed in a plane parallel to the substrate, and has a feature of a laminated structure of a thin metal film and polysilicon.
- the present invention will be described below with reference to FIGS. 95 and 96.
- a planar silicon layer 1002 is formed on the buried oxide film layer 1001, and the planar silicon layer 1002 includes an N + drain diffusion layer 1003 and a P + drain diffusion layer 1004, and the surfaces of the N + drain diffusion layer 1003 and the P + drain diffusion layer 1004.
- a silicide layer 1011 is formed to lower the resistance of the drain diffusion layer, and the N + drain diffusion layer 1003 and the P + drain diffusion layer 1004 are directly connected to each other by the silicide layer 1011. For this reason, contact and element isolation for connecting the N + drain diffusion layer 1003 and the P + drain diffusion layer 1004 are not required, so that the area occupied by the inverter can be reduced.
- the NMOS transistor Qn111 is formed by the columnar silicon layer 1005 formed on the N + drain diffusion layer 1003, and the PMOS transistors Qp111 and Qp112 are formed by the columnar silicon layers (1006a, 1006b) formed on the P + drain diffusion layer 1004. Yes.
- a gate insulating film 1007 is formed of a high-k film such as HfO2 so as to surround the columnar silicon layers (1005, 1006a, 1006b), and a thin metal film 1030 such as TaN or TiN and polysilicon 1029 are surrounded so as to surround it.
- Gate electrodes (1008, 1008a, 1008b) having a stacked structure are formed.
- An N + source diffusion layer 1009 is formed above the columnar silicon layer 1005 forming the NMOS, and a P + source diffusion layer (1010a, 1010b) is formed above the columnar silicon layers (1006a, 1006b) forming the PMOS.
- a silicide film 1012 is formed.
- a silicon nitride film 1013 is formed as a contact stopper so as to cover these elements, an interlayer silicon oxide film 1014 is further formed on the silicon nitride film 1013, and a contact (1015 is formed so as to penetrate the planarized silicon oxide film 1014. 1016, 1016a, 1016b, 1017a, 1017b).
- the contact 1015 formed at the boundary between the N + drain diffusion layer 1003 and the P + drain diffusion layer 1004 is connected to the output terminal Vout11 through the wiring layer, and the contact 1016 formed on the columnar silicon layer 1005 forming Qn111 passes through the wiring layer.
- Contacts (1016a, 1016b) connected to the ground potential Vss11 and formed on top of the columnar silicon layers (1006a, 1006b) forming Qp111 and Qp112 are connected to the power supply potential Vcc11 through the wiring layer and surround the columnar silicon layer 1005.
- (a) is a plan view and (b) is a cross-sectional view taken along the line AA ′. Since the process up to the formation of the gate conductive film is the same as the manufacturing process of the second embodiment, it will be described below from the process of forming the gate conductive film.
- a high-k film 1007 such as HfO 2 is formed as a gate insulating film with a thickness of about 1 to 5 nm by CVD or ALD.
- a thin metal film 1030 such as TiN or TaN is formed as a gate conductive film with a thickness of about 1 to 10 nm, and then polysilicon 1029 is formed so that the columnar silicon layer is embedded.
- the polysilicon 1029 and the thin metal film 1030 are polished and planarized by CMP.
- CMP is stopped at the nitride film 1018 on the columnar silicon layer.
- the nitride film 1018 as a CMP stopper, the CMP polishing amount can be controlled with good reproducibility.
- other films can be used as the CMP stopper film as long as they function as a CMP stopper film.
- the polysilicon 1029 and the thin metal film 1030 are etched back to determine the gate length. This step determines the gate length.
- a silicon nitride film 1022 is formed on the surface.
- the silicon nitride film 1022 is etched back to form a silicon nitride film side wall 1023 on the metal gate.
- a gate electrode having a film thickness of the silicon nitride film sidewall 1023 remaining on the gate can be formed in a self-aligned manner around the columnar silicon layer.
- the film thickness and etchback amount of the silicon nitride film 1023 can be adjusted so that the electrode film thickness is obtained.
- the silicon nitride film is used as the protective film for the sidewall, but other than this, as long as the protective film functions as the protective film for the sidewall, for example, a silicon oxide film is used. Can also be used.
- a resist or a multilayer resist is applied, and a gate wiring pattern is formed with a resist 1024 by lithography.
- gate bottom and the high-k film under the gate are etched by reactive ion etching using a resist mask.
- gate electrodes (1008, 1008a, 1008b) and gate wirings (1008c, 1008d) are formed.
- the silicon nitride film 1018 and the silicon nitride film side wall 1023 on the columnar silicon are removed by wet processing.
- a silicon nitride film 1025 is formed on the surface to a thickness of about 10 to 50 nm.
- the silicon nitride film 1025 is etched back to expose the upper surface of the columnar silicon layer and the upper surface of the planar silicon layer, and the sidewall and gate sidewalls on the upper portion of the columnar silicon layer are covered with the silicon nitride film 1025.
- This structure has the following effects.
- the gate electrode (1008, 1008a, 1008b) and the upper part of the columnar silicon layer, and the gate electrode (1008, 1008a, 1008b) and the drain diffusion layer (1003, 1004) are separated by the nitride film 1025, excessively A short circuit between the gate electrode and the upper portion of the columnar silicon layer and a short circuit between the gate electrode and the drain diffusion layer due to the formed silicide can be prevented.
- the silicide layer When an excessive silicide layer is formed on the upper part of the columnar silicon layer and the silicide layer approaches the junction of the source diffusion layer, it becomes a factor that increases junction leakage. Therefore, it is necessary to control so that the silicide layer is not excessively formed.
- the high-k film 1007 is covered with the nitride film 1025 at the time of ion implantation in the next process, it is possible to prevent damage to the high-k film in the subsequent process and damage due to impurity implantation. it can.
- the thin metal film 1030 which is a part of the gate electrode is covered with the nitride film 1025 so that the metal film is not exposed to the surface. Therefore, it is manufactured on the same manufacturing line as a conventional transistor having a polysilicon gate. It becomes possible.
- the silicon nitride film 1025 is a silicon oxide film, it is wet-etched by hydrofluoric acid used for the cleaning / peeling process and the silicide pretreatment, so that it does not dissolve in hydrofluoric acid like the silicon nitride film.
- a membrane is preferred. If the nitride film is too thin, the High-k film cannot be completely protected. If it is too thick, the occupied area increases by the film thickness formed on the gate sidewall.
- a silicon nitride film is used as the protective film.
- the protective film functions as a protective film, for example, a film having a laminated structure of a silicon nitride film and a silicon oxide film is used. You can also.
- an N + source diffusion layer 1009 is formed on the columnar silicon layer 1005 by ion implantation or the like.
- P + source diffusion layers (1010a, 1010b) are formed on top of the columnar silicon layers (1006a, 1006b).
- a metal film such as Ni or Co is sputtered, and heat treatment is performed to silicidize the source / drain surface and the upper surface of the gate electrode made of polysilicon, thereby removing the unreacted metal film.
- a silicide layer 1011 on the drain diffusion layer (1003, 1004), a silicide layer 1012 on the source diffusion layer (1009, 1010a, 1010b), and a silicide layer 1031 on the gate electrode are formed.
- a liner silicon nitride film 1013 is formed, then a silicon oxide film 1014 is formed, and the silicon oxide film is planarized by CMP.
- the liner nitride film is used as an etching stopper during contact formation.
- contacts (1015, 1016, 1016a, 1016b, 1017a, 1017b) are formed on the source diffusion layer on the planar silicon layer, on the gate, and on the drain diffusion layer on the columnar silicon layer.
- the gate structure which is a laminated structure of the thin metal film on the gate insulating film side and the polysilicon on the surface side suppresses depletion of the gate electrode by the thin metal film on the gate insulating film side.
- the surfaces of the gate electrode and the gate wiring are polysilicon, they can be manufactured on the same manufacturing line as a transistor using a conventional polysilicon gate.
- the gate electrode is formed of a laminated structure of a thin metal film and polysilicon as in the embodiment 10, and further, the parasitic capacitance between the gate wiring and the drain diffusion layer at the bottom of the columnar silicon layer in the embodiment 8 is reduced. Examples of SGT structures that can be shown.
- FIG. 111 is an equivalent circuit of a CMOS inverter using the present invention. Since the circuit operation of the CMOS inverter is the same as that of the second embodiment, it is omitted here.
- FIG. 112 is a plan view of a CMOS inverter using the present invention.
- 113 (a) and 113 (b) are cross-sectional views taken along cut lines AA ′ and BB ′ in FIG.
- the gate electrodes (1108, 1108a, 1108b) surrounding the columnar silicon layer and the gate wirings (1108c, 1108d) extending from these gate electrodes have the same height, that is,
- the gate electrode and the gate wiring are integrally formed, and the whole upper surface of the integrally formed gate electrode and gate wiring is formed in a plane parallel to the substrate.
- the gate electrode and the gate wiring have a laminated structure of a thin metal film and polysilicon.
- an insulating film 1120 such as a silicon oxide film exists between the gate electrodes (1108, 1108a, 1108b) and the gate wirings (1108c, 1108d) and the drain diffusion layers (1103, 1104).
- the CMOS inverter shown in this embodiment can be formed using a manufacturing method as described below.
- a silicon oxide film is formed so as to embed the columnar silicon layer, and then the silicon oxide film is CMP-processed.
- the silicon oxide film is etched back, and a silicon oxide film is formed in the drain diffusion layer by a desired film thickness, thereby forming an inverter structure that reduces the parasitic capacitance between the gate electrodes.
- a gate having a laminated structure of a thin metal film and polysilicon so as to embed the columnar silicon layer after the columnar silicon layer is formed.
- a conductive film is formed, and then the gate conductive film is planarized by CMP, followed by etching back the gate conductive film, and subsequently forming and etching back a silicon nitride film for determining the gate electrode film thickness.
- a gate electrode and a gate electrode having a laminated structure of a thin metal film and a polysilicon film are formed by forming a silicon nitride film sidewall for forming the electrode in a self-aligned manner and then performing lithography and etching of the gate wiring pattern.
- More extended gate wiring is integrally formed, and the entire upper surface of the integrally formed gate electrode and gate wiring is the substrate.
- the gate structure which is a laminated structure of the thin metal film 1130 on the gate insulating film side and the polysilicon 1129 on the surface side suppresses depletion of the gate electrode by the thin metal film on the gate insulating film side. Since the surface of the gate electrode and the gate wiring is polysilicon, it can be manufactured on the same manufacturing line as a transistor using a conventional polysilicon gate. Further, by inserting the insulating film 1120 between the gate insulating film and the drain diffusion layer, the insulating film between the gate electrode and the gate wiring and the drain diffusion layer becomes thick, so that the parasitic capacitance between the gate and the drain diffusion layer is reduced. In particular, the parasitic capacitance can be greatly reduced by inserting an insulating film having a relatively low relative dielectric constant such as a silicon oxide film between the gate insulating film and the drain diffusion layer.
- the columnar semiconductor layer column In order to improve the controllability of the channel by the gate in the SGT and sufficiently suppress the short channel effect, the columnar semiconductor layer column must be formed with a dimension sufficiently smaller than the gate length. In order to reduce the size of the columnar semiconductor layer, the size can be reduced relatively easily by a method of shrinking the size during dry etching or a method of performing sacrificial oxidation after forming the columnar semiconductor layer. For this reason, since it is not so difficult to form a columnar semiconductor layer having a size smaller than the minimum processing dimension, in an actual SGT, the columnar semiconductor layer is often formed smaller than the minimum processing dimension.
- the area of the interface between the silicide layer and the diffusion layer formed in the upper diffusion layer of the columnar semiconductor layer is reduced.
- Interfacial resistance increases.
- the diffusion layer above the columnar semiconductor layer having a small interface area with the silicide layer it becomes a main factor of source / drain parasitic resistance, which is a cause of deterioration of transistor characteristics.
- the contact area between the contact formed on the pillar-shaped semiconductor layer and the top surface of the pillar-shaped semiconductor is smaller than the bottom area of the contact. Since the area is the upper surface of the semiconductor layer, the contact resistance is increased.
- the above problems are solved in the SGT in which the diameter of the columnar semiconductor layer is small, particularly 50 nm or less, and the SGT having a structure in which the diameter of the columnar semiconductor layer is smaller than the minimum processing dimension.
- An SGT structure and method of manufacture are provided.
- FIG. 114 is an equivalent circuit of a CMOS inverter using the present invention.
- the circuit operation of the CMOS inverter will be described below.
- the input signal Vin13 is applied to the gates of NMOS Qn131 and PMOS Qp131 and Qp132.
- Vin13 is “1”
- NMOS Qn131 is in the ON state
- PMOS Qp131 and Qp132 are in the OFF state
- Vout13 is “0”.
- Vin13 is “0”
- the NMOS Qn131 is in the OFF state
- the PMOSs Qp131 and Qp132 are in the ON state
- the Vout13 is “1”.
- the CMOS inverter operates such that the signal Vout13 as the output value takes the opposite value to the signal Vin13 as the input value.
- FIG. 115 is a plan view of a CMOS inverter using the present invention.
- a plan view of the CMOS inverter of FIG. 115 will be briefly described below.
- a planar silicon layer is formed on the buried oxide layer 1200.
- the planar silicon layer is a lower N + diffusion layer 1201 in the N + implantation region and a lower P + diffusion layer 1211 in the P + implantation region.
- a lower silicide layer 1203 is formed on the surface of the planar silicon layer to reduce the parasitic resistance of the source / drain region, and the lower N + diffusion layer 1201 and the lower P + diffusion layer 1211 are connected by the lower silicide layer 1203.
- An NMOS transistor Qn131 is formed on the lower N + diffusion layer 1201, and PMOS transistors Qp131 and Qp132 are formed on the lower P + diffusion layer 1211.
- Contacts (1209a, 1209b) formed on gate wirings (1208a, 1208b) extending from the gate electrodes of the respective transistors are connected to the input wiring Vin13, and contacts 1209c formed on the lower silicide layer 1203 are output wirings.
- a contact 1209d connected to Vout13 and formed on the upper diffusion layer of the columnar silicon layer forming the NMOS transistor Qn131 is connected to the ground potential wiring Vss13, and the columnar silicon layer forming the PMOS transistors Qp131 and Qp132 is formed.
- the contact 1209e formed on the upper diffusion layer constitutes an inverter by being connected to the power supply potential wiring Vcc13.
- a planar silicon layer is formed on the buried oxide film layer 1200.
- the planar silicon layer is composed of a lower N + diffusion layer 1201 and a lower P + diffusion layer 1211.
- a lower epitaxial silicon layer 1202 is formed, and a lower silicide layer 1203 is formed on the surface thereof.
- the lower silicide layer 1203 connects the lower N + diffusion layer 1201 and the lower P + diffusion layer 1211 directly to each other.
- the NMOS transistor Qn131 is formed by the columnar silicon layer 1204 formed on the lower N + diffusion layer 1201, and the PMOS transistor Qp131 and Qp132 are formed by the columnar silicon layers 1214a and 1214b formed on the lower P + diffusion layer 1211. .
- a gate insulating film 1207 is formed so as to surround the columnar silicon layers (1204, 1214a, 1214b), and a gate electrode 1208 is formed so as to surround it.
- Upper epitaxial silicon layers (1205, 1215) are formed on the upper part of the columnar silicon layer, and are insulated from the gate electrode 1208 via the first insulating film 1210. Epitaxial silicon layers formed on top of adjacent columnar silicon layers (1214a, 1214b) with a certain distance or less are connected to each other.
- the upper epitaxial silicon layer 1205 formed on the NMOS Qn121 is an upper N + diffusion layer
- the upper epitaxial silicon layer 1215 formed on the PMOS Qp121 and Qp122 is an upper P + diffusion layer 1215.
- An upper silicide layer 1206 is formed on the epitaxial silicon layer to reduce parasitic resistance in the source / drain region.
- the diameter of the columnar silicon layer is small, the interface resistance between the silicide layer and the diffusion layer at the upper part of the columnar silicon layer becomes a main factor of the source / drain parasitic resistance, so it is desirable that the area of the interface between the two is as large as possible.
- the upper silicide layer 1206 By setting the upper silicide layer 1206 to be formed on the surface of the upper epitaxial silicon layer, the area of the interface between the silicide layer and the diffusion layer increases, and the interface resistance decreases.
- the contacts (1209d, 1209e) formed on the epitaxial silicon layers (1205, 1215) above the columnar silicon layer are completely formed on the epitaxial silicon layer.
- the epitaxial silicon layer and the condition where the selection ratio between the silicide layer formed on the surface and the silicon oxide film is large are used. Therefore, even if overetching is performed during contact formation, the epitaxial silicon layer and the silicide layer are almost all Since it is not etched, a short circuit between the contact and the gate does not occur.
- FIGS. An example of a manufacturing method for forming the semiconductor device of the present invention will be described below with reference to FIGS.
- (a) is a plan view
- (b) is a cross-sectional view taken along the line A-A '.
- the silicon nitride film forming process which is the same process as FIG.
- a silicon nitride film 1222 is formed after the gate is formed.
- the silicon nitride film 1222 is etched back to expose the upper diffusion layer and the lower diffusion layer of the columnar silicon layer. If the silicon nitride film 1210 above the gate electrode does not exist after the etch back, the upper portion of the gate electrode and the epitaxial silicon layer formed in the next process will be in contact with each other. In order to leave the silicon nitride film 1210 on the gate electrode, it is necessary to make the silicon nitride film 1222 formed in FIG. 117 thicker than the gate electrode. In this case, the silicon nitride film can be left on the gate electrode even after the etch back.
- silicon is selectively epitaxially grown on the upper and lower diffusion layers of the columnar silicon layer, and the epitaxial silicon layers formed in the diffusion layers on the upper side of the adjacent columnar silicon layers within a predetermined interval are mutually connected.
- Epitaxial silicon layers (1223, 1224) are formed so as to be connected.
- the diameter of the epitaxial silicon layer is set to be larger than the contact diameter formed in a later step, a structure in which the contact and the gate are not short-circuited can be achieved.
- the epitaxial silicon layer 1223 is shared by the adjacent columnar silicon layers (1214a and 1214b), the parasitic resistance of the upper diffusion layer in each columnar silicon layer can be further reduced.
- impurities are implanted by ion implantation or the like in order to form the upper diffusion layer of the columnar silicon layer.
- An upper N + diffusion layer 1205 is formed by implanting As or P, and an upper P + diffusion layer 1215 is formed by implanting B or BF 2 .
- a metal such as Co or Ni is sputtered and heat treatment is performed to selectively silicide the source / drain diffusion layer to form a lower silicide layer 1203 and an upper silicide layer 1206.
- a metal such as Co or Ni is sputtered and heat treatment is performed to selectively silicide the source / drain diffusion layer to form a lower silicide layer 1203 and an upper silicide layer 1206.
- the area of the interface between the upper silicide layer 1206 and the upper diffusion layer becomes larger than the upper surface of the columnar silicon layer. Therefore, the interface resistance is reduced and the source / drain parasitic resistance can be reduced.
- the interface area between the upper diffusion layer and the silicide layer in each columnar silicon layer further increases, so the reduction in interface resistance is large, and parasitic resistance Is further reduced.
- contacts (1209a to 1209e) are formed after the formation of the silicon oxide film as the interlayer film. At this time, since the contacts (1209d and 1209e) formed on the upper part of the columnar silicon layer are completely formed on the upper epitaxial silicon layer, even if overetching is performed at the time of forming the contact, a short circuit between the contact and the gate is performed. Will not occur.
- an epitaxial silicon layer is formed by both NMOS and PMOS.
- an epitaxial silicon layer for NMOS and an epitaxial silicon germanium layer for PMOS stress is applied to the channel portion in PMOS. It is also possible to improve mobility by adding.
- the contact area between the upper silicide layer 1206 and the upper diffusion layer is only the area of the upper surface of the columnar silicon layer.
- the contact area between the upper silicide layer 1206 and the upper diffusion layer (1205, 1215), which is an epitaxial silicon layer is larger than the area of the upper surface of the columnar silicon layer, so that the contact resistance is reduced.
- the interface resistance between the silicide layer and the upper diffusion layer per columnar silicon layer is further reduced. For this reason, by forming the epitaxial silicon layer, the contact resistance between the silicide layer and the upper diffusion layer, which is the main factor of the source-drain parasitic resistance, is greatly reduced, so that the performance of the SGT can be improved.
- the contact bottom is formed with a minimum processing dimension.
- the contact area of the contact is determined by the size of the upper portion of the columnar silicon layer smaller than the contact.
- the contact area of the contact is determined by the size of the upper part of the columnar silicon layer.
- contact formation in SGT it is desirable to simultaneously form contacts formed in the upper diffusion layer and the lower diffusion layer of the columnar silicon layer in order to reduce the manufacturing process.
- over-etching higher than the columnar silicon layer height is performed on the contact formed in the upper diffusion layer.
- the gate and the contact are likely to be short-circuited if excessive overetching is performed on the contact formed in the upper diffusion layer of the columnar silicon layer. .
- this short circuit can be alleviated by forming a liner nitride film for a contact stopper, but this is not a fundamental solution.
- the contact is completely formed on the epitaxial silicon layer, and the contact etching uses a condition in which the selectivity ratio between the epitaxial silicon layer and the silicide layer formed on the surface thereof and the silicon oxide film is large. Contact and gate will not be short-circuited. As described above, by using this embodiment, it is possible to realize a reduction in contact resistance, a reduction in source / drain parasitic resistance, and a short-circuit between a contact and a gate as compared with the conventional SGT.
- an example is shown in which the upper diffusion layers of adjacent columnar silicon layers forming a PMOS are connected to each other.
- the film formation conditions and the film thickness of the epitaxial silicon layer By adjusting the film formation conditions and the film thickness of the epitaxial silicon layer, only the upper diffusion layer of the adjacent columnar silicon layer can be connected in a self-aligned manner within a specific interval.
- the interface area between the silicon and the silicide in the upper diffusion layer is increased, so that the interface resistance can be reduced.
- a semiconductor device including a circuit formed by a transistor and a manufacturing method thereof a semiconductor device including an inverter in which drains of transistors having a simple circuit configuration are connected to each other for simplicity, and a manufacturing method thereof.
- a semiconductor device including an inverter in which drains of transistors having a simple circuit configuration are connected to each other for simplicity and a manufacturing method thereof.
- the SOI substrate is described as an example of the substrate on which the transistor is formed.
- an insulating film is formed on the substrate, and a planar semiconductor layer is formed on the insulating film. It will be apparent to those skilled in the art that it can be implemented using any other substrate.
- 1 is an equivalent circuit diagram of a CMOS inverter according to a first embodiment of the present invention. It is a top view of the CMOS inverter of 1st Example of this invention. It is sectional drawing of the CMOS inverter of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example of this invention. It is a part of manufacturing process of 1st Example
- CMOS inverter of the 2nd Example of this invention It is an equivalent circuit schematic of the CMOS inverter of the 2nd Example of this invention. It is a top view of the CMOS inverter of 2nd Example of this invention. It is sectional drawing of the CMOS inverter of 2nd Example of this invention. It is a part of manufacturing process of 2nd Example of this invention. It is a part of manufacturing process of 2nd Example of this invention. It is a part of manufacturing process of 2nd Example of this invention. It is a part of manufacturing process of 2nd Example of this invention. It is a part of manufacturing process of 2nd Example of this invention. It is the equivalent circuit schematic of the other CMOS inverter of the 1st Example of this invention.
- CMOS inverter of the 8th Example of this invention It is an equivalent circuit schematic of the CMOS inverter of the 8th Example of this invention. It is a top view of the CMOS inverter of the 8th Example of this invention. It is sectional drawing of the CMOS inverter of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is a part of manufacturing process of the 8th Example of this invention. It is
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Thin Film Transistor (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
特許文献1のSGTを用いて設計したCMOSインバーターの等価回路を図123(a)に、CMOSインバーターのレイアウトを図123(b)に、図123(b)のレイアウトにおけるA-A’のカットラインの断面構造を図123(c)に示す。図123(b)、(c)を参照すると、Si基板1301上にNウェル1302およびPウェル1303が形成され、Si基板表面にはNウェル領域にPMOSを形成する柱状シリコン層1305が形成され、Pウェル領域にNMOSを形成する柱状シリコン層1306が形成され、それぞれの柱状シリコン層を取り囲むようにゲート1308が形成される。PMOSを形成する柱状半導体の底部に形成されるP+ドレイン拡散層1310およびNMOSを形成する柱状半導体の底部に形成されるN+ドレイン拡散層1312は出力端子Vout14に接続され、PMOSを形成する柱状シリコン層上部に形成されるソース拡散層1309は電源電位Vcc14に接続され、NMOSを形成する柱状シリコン層上部に形成されるソース拡散層1311は接地電位Vss14に接続され、PMOSとNMOSの共通のゲート1308は入力端子Vin14に接続されることによりCMOSインバーターを形成する。
図124(a)を参照すると、NMOSであるQn151およびQn152によってフリップフロップが形成され、NMOSであるQn151およびQn152はそれぞれビット線であるBLおよびBLBに接続される。また、Q151およびQ152はセンスアンプを活性化するためのNMOSであるQn153に接続され、Qn153のソースは接地電位であるVss15に接続される。
図124(b)、(c)を参照すると、Si基板1321上にPウェル1322が形成され、Si基板表面には複数の柱状シリコン層(1323~1328)が形成される。2つの柱状シリコン層(1327、1328)によってセンスアンプを構成するNMOSであるQn151が形成され、他の2つの柱状シリコン層(1324、1325)によってセンスアンプを構成する他のNMOSであるQn152が形成される。それぞれの柱状シリコン層の外周にゲート絶縁膜1329およびゲート電極1330が形成される。また、それぞれの柱状シリコン層の下部、上部にはそれぞれソース、ドレインとなるN型拡散層(1331、1332)が形成される。対を成すビット線BL1333およびBLB1334は、多結晶シリコン膜によってそれぞれMOSトランジスタQn151、Qn152のドレイン拡散層、即ち柱状シリコン層上部のN+拡散層1332上に形成されるコンタクトにより接続される。トランジスタQn151のゲート電極1330は図124(b)のレイアウトで左斜め上にある柱状シリコン層1323の上部まで取り出され、コンタクトを経由してビット線BL1333に接続されている。トランジスタQn152のゲート電極1330は図124(b)のレイアウトで右斜め下にある柱状シリコン層1326の上部まで取り出され、コンタクトを経由してビット線BLB1334に接続されている。
柱状シリコン層(1323、1326)はMOSトランジスタを形成するために設けられているのではなく、ビット線をゲート電極に接続する際のビット線コンタクトを確実にするための台座として設けられている。柱状シリコン層の底部に形成されたソース拡散層1331は共通のソースノードであり、コンタクト1335によって、接地電位であるVss15に接続される。また、図には示していないが、同じビット線に沿って、PMOSよりなるPMOSセンスアンプが同様の構造とレイアウトにより形成される。
このSGT形成方法においては、図125(d)においてレジスト1404を柱状シリコン層の側壁のゲート導電膜とちょうど接するように形成しなくてはいけないので、ゲート配線形成のプロセスマージンが小さく、安定して製造することは困難である。この点に関して、以下に説明する。
続いて、図127に図125(d)においてゲート配線レジスト1404が左にズレた場合の工程図を示す。図127(d)は露光のアライメント時にレジストが左にズレた場合である。このとき、レジスト1424と柱状シリコン層1421上部のゲート電極の間で重なり部1426が生じる。図127(e)において、ゲートエッチを行う。図127(f)において、レジストを剥離する。この場合、SGTのゲート電極1423はレジストが形成される側で形状異常1427が生じてしまう。
上記のような、アライメント起因のレジストのズレはウェハー上の様々なパターンやウェハー上の位置によっては必ず生じてしまうため、このSGT形成方法においてはゲート配線形成のプロセスマージンが極端に小さくなる。
特許文献2のSGTを用いて設計したCMOSインバーターの断面構造を図128(a)~(e)に示した。図128(a)に示されるように、Si基板上にNウェル1502およびPウェル1501が形成され、Si基板表面にはNウェル領域にP+拡散層1504が形成され、Pウェル領域にN+拡散層1503が形成され、P+拡散層1504とN+拡散層1503はLOCOS1505により分離されている。P+拡散層1504上にはPMOSを形成する柱状シリコン層1510が形成され、N+拡散層上にはNMOSを形成する柱状シリコン層1509が形成され、それぞれの柱状シリコン層を取り囲むようにゲート1506が形成される。図には示されていないが、PMOSを形成する柱状シリコン層下部の拡散層1504は電源電位に接続され、NMOSを形成する柱状シリコン層下部の拡散層1503は接地電位に接続され、ゲート電極1506は入力電位に接続される。また、NMOSおよびPMOSを形成する柱状シリコン層上部の拡散層(1512、1511)は配線層1513に接続され、配線層1513は出力電位に接続される。
図128(b)の従来例においても図128(a)と同様の構成にてインバーターが形成されている。図128(b)においては、NMOSおよびPMOSのシリコン層上部の拡散層1531と1532をシリサイド層1533によって接続し、シリサイド層1532上に形成されたコンタクトを通して配線層1534に接続される。
この構造においては、NMOSとPMOSのシリコン層上部の拡散層をシリサイド層1533により接続しているため、配線層のレイアウトが容易になる。しかし、インバーターの面積に関しては、柱状シリコン層下部の拡散層(1523、1524)と素子分離1525の面積によって決まってしまうので、図128(a)と比べて小さくすることはできない。また、製造工程を追加してシリサイド層の形成およびパターニングを行うため、製造工程数が多くなってしまう。また、図128(a)、(b)のインバーターともに特許文献1のSGTと同様に、ソース拡散層における寄生抵抗が大きく、回路性能が劣化する要因となる。
図128(c)を参照して、Si基板にPウェル1541が形成され、Si基板表面にはN+拡散層1542が形成され、N+拡散層表面にはシリサイド層1543が形成される。また、N+拡散層1542及びシリサイド層1543はLOCOS1551により分離されている。シリサイド層1543上にはPMOSを形成する柱状シリコン層1548およびNMOSを形成する柱状シリコン層1547が形成され、それぞれの柱状シリコン層を取り囲むようにゲート1544が形成される。図には示されていないが、シリサイド層1543は出力電位に接続され、ゲート電極1544は入力電位に接続され、PMOSを形成する柱状シリコン層上部の拡散層1550は電源電位に接続され、NMOSを形成する柱状シリコン層下部の拡散層1549は接地電位に接続される。このインバーターにおいては、図128(a)、(b)と異なり、出力電位が基板側に出力される。
しかし、この構造では、柱状シリコン層底部のシリサイド層1543を形成した後で、トランジスタを形成しなければならない。通常、シリサイド層は耐熱性が低く、特に65nm世代以降の微細なデバイスに採用されているニッケルシリサイド(NiSi)の場合には、その耐熱性は500~600℃程度である。このため、トランジスタ形成に必要な1000℃程度の不純物活性化熱処理が加わるとシリサイド層は過剰反応してしまい高抵抗化やリーク電流の増加の原因となる。したがって、この従来例の構造においては実際には安定して製造することは困難である。さらに、柱状シリコン層底部にシリサイド層1443が存在しているため、柱状シリコン層の成長時においてシリコンをエピタキシャル成長により形成することができないので、トランジスタ特性が著しく低下してしまう。
図128(d)の従来例においても、(c)のインバーターと同様に出力電位が基板側に形成されている。この従来例では、柱状シリコン層1568底部のP+拡散層領域1566とSi基板上のN+拡散層1562の界面にシリサイド層1563を形成することにより、NMOSを形成する柱状シリコン層1567底部のN+拡散層1565と基板上のN+拡散層1562接続しているため、N+拡散層とP+拡散層を分離するための素子分離が必要ないので、インバーターの占有面積は小さくなる。しかし、この従来例においても、図128(b)と同様にシリサイド層形成後にトランジスタが形成されるため、シリサイド層の耐熱性の問題のため、安定して製造することは困難である。さらに、図128(c)の場合と同様に、PMOS柱状シリコン層底部にシリサイド層1563が存在しているため、PMOSの柱状シリコン層の成長時においてシリコンをエピタキシャル成長により形成することができないので、トランジスタ特性が著しく低下してしまう。
以下にこのインバーターについて説明する。図128(e)に示されるように、埋め込み酸化膜1571上にN+ソース拡散層1572およびP+ソース拡散層1573が形成され、N+ソース拡散層1572上にはNMOSを形成する柱状シリコン層1574が形成され、P+ソース拡散層上にはPMOSを形成する柱状シリコン層1575が形成される。また、NMOSを形成する柱状シリコン層1574の上部にはN+ドレイン拡散層1576が形成され、PMOSを形成する柱状シリコン層1575上にはP+ドレイン拡散層1577が形成される。それぞれの柱状シリコン層の周囲にはゲート1578が形成される。N+ドレイン拡散層1572は配線層1579から延びるコンタクトを経由して接地電位に接続され、P+ドレイン拡散層1573は配線層1580から延びるコンタクトを経由して電源電位に接続され、NMOSおよびPMOSを形成する柱状シリコン層上部の拡散層(1576、1577)は配線層1581から延びるコンタクトを経由して出力電位に接続される。
本従来例においては、図128(a)、(b)と同様に、出力電位が配線側に形成されるため、基板側に素子分離が必要になる。しかし、SOI基板を使用しているため、ウェルを形成する必要がないので、ソース拡散層(1572、1573)をエッチングにより分離するだけで素子分離幅を形成することができる。このため、素子分離にLOCOSを用いた図128(a)、(b)のインバーターよりも素子分離幅の縮小分だけ占有面積を縮小することができる。しかし、この従来例についても、ソース拡散層における寄生抵抗が大きく、回路性能が劣化する要因となる。
以上より、図128(a)~(e)に示したいずれのインバーターにおいても、ソース拡散層の寄生抵抗による回路性能の低下を避けることができない。
図129(a)において、シリコン基板上にシリコン酸化膜1601、ゲート導電体1602、シリコン酸化膜1603の順で成膜する。図129(b)において、シリコン酸化膜1603、ゲート導電体1602、シリコン酸化膜1601を貫通するようにコンタクトホール1604を形成する。図129(c)において、コンタクトホールの内壁にゲート絶縁膜1605を形成する。図129(d)において、エピタキシャル成長によりシリコンをコンタクトホール内に成膜して、柱状シリコン層1606を形成する。図129(e)において、柱状シリコン層上部を分離する。
第1の方法においては、柱状シリコン層は単結晶であるシリコン基板をエッチングすることにより形成されているため、犠牲酸化や水素アニール(非特許文献2)等の表面処理を行うことによってエッチング等によって生じるチャネル部の欠陥や凹凸を回復させることが容易である。このため、チャネル部において高いキャリア移動度を実現することができ、高性能なトランジスタ特性が得られやすい。
一方、第2の方法においては、柱状シリコン層はコンタクトホールの中にエピタキシャル成長されたシリコンによって形成されているが、一般的にはコンタクトホールの側壁にはエッチング時に形成される凹凸が存在しており、このような凹凸を除去することは困難である。したがって、コンタクトホール側壁に形成されるチャネル部表面にも凹凸が転写されるため、キャリアの移動度は低くなり、高性能なトランジスタを形成するのは困難である。また、現在製造されている65nm世代のLSIのコンタクトホールサイズは80nm程度であり、今後さらにコンタクトホールが微細化していくことを考慮すると、このような微細なコンタクトホールの底部からエピタキシャルシリコンを十分な歩留まりで成膜することは難しい。
第1に、素子の面積縮小及び面積効率のよい素子分離を実現し、回路の占有面積を低減すること。第2に、トランジスタの性能を向上するために、ソースドレイン部の寄生容量及び寄生抵抗を低減すること。第3に、ゲート配線の形成において広いプロセスマージンを持つプロセスを実現すること。
埋め込み酸化膜層1の上に平面状シリコン層2が形成され、平面状シリコン層2はN+ドレイン拡散層3およびP+ドレイン拡散層4からなり、N+ドレイン拡散層3とP+ドレイン拡散層4の境界付近の表面にはN+ドレイン拡散層3とP+ドレイン拡散層4を互いに直接接続させるためのシリサイド層が形成される。このため、N+ドレイン拡散層3とP+ドレイン拡散層4を接続するためのコンタクトや素子分離が必要ないので、インバーターの占有面積を小さくすることができる。また、素子分離は平面状シリコン層2を分離するだけで形成することができるので、工程数が少なく、最小加工寸法で素子分離を形成することができる。N+ドレイン拡散層3に形成される柱状シリコン層5によってNMOSトランジスタQn11が形成され、P+ドレイン拡散層4に形成される柱状シリコン層(6a、6b)によってPMOSトランジスタQp11およびQp12が形成されている。柱状シリコン層(5、6a、6b)を取り囲むようにHfO2などのHigh-k膜によりゲート絶縁膜7が形成され、それを取り囲むようにTaNやTiNなどの金属膜によりゲート電極(8、8a、8b)が形成されている。NMOSを形成する柱状シリコン層5の上部にN+ソース拡散層9が、PMOSを形成する柱状シリコン層(6a、6b)の上部にP+ソース拡散層(10a、10b)が形成される。これらの素子を覆うようにコンタクトストッパーとしてシリコン窒化膜13が形成され、さらにシリコン窒化膜13上に層間シリコン酸化膜14が形成され、平坦化されたシリコン酸化膜14を貫通するようにコンタクト(15、16、16a、16b、17a、17b)が形成されている。なお、シリコン窒化膜13に応力を持たせることにより、柱状シリコン層のチャネル部に応力を加え、モビリティーを向上させることができる。特に、NMOS上には引っ張り応力を持つシリコン窒化膜を、PMOS上には圧縮応力を持つシリコン窒化膜を別々に形成することにより、NMOSとPMOSにおいて共にモビリティーを向上させることも可能である。
また、本実施例の構造においては、ドレイン拡散層上のシリサイド層11は平面状シリコン層2の底部まで到達していない。これは、ドレイン拡散層(3,4)とシリサイド層11の界面の抵抗はソースドレイン寄生抵抗の主要因の一つであるため、ドレイン拡散層とシリサイド層の界面の面積をなるべく大きくするためである。
ゲート配線を所望の形状および寸法に安定してエッチングするためには、平面状シリコン層2の膜厚は100nmより薄くすることが好ましいが、シリサイドと拡散層の界面面積を確保しつつ、ゲート加工を容易にするためには、平面状シリコン層2の膜厚は20~40nmであることが、更に好ましい。
一般に、シリサイド層11の膜厚は10nm~30nm程度であるが、ドレイン拡散層とシリサイド層の界面面積を確実に確保するためには、10nm~20nmであることが好ましい。
ゲート電極及び配線の膜厚は、SGTの集積回路の占有面積を小さくするためにできるだけ小さくすることが好ましいが、ゲート配線のシート抵抗が回路への支障を来たさないためには、最低でも10nm程度の膜厚が必要である。したがって、ゲート配線膜厚は10nm~50nm程度であることが好ましく、高密度なSGTの集積回路を形成するためには、10nm~30nmであることが更に好ましい。
上記の構造は、ドレイン拡散層上のシリサイド層11が平面状シリコン層2の底部まで到達していないものであったが、ゲート配線露光時のパターニングや、その後のゲート配線エッチング時の段差部におけるエッチングやゲート寸法の制御の容易性を重視し、図41、42に示されるように、平面状シリコン層の厚さをできるだけ小さくし(好ましくは、10~30nm程度)、シリサイド層211が埋め込み酸化膜まで形成される構造とすることもできる。
第2に、柱状シリコン上部の側壁を窒化膜で覆うことにより、図38のシリサイド化工程において、柱状シリコン層の側壁から過剰にシリサイド化するのを防ぐことができる。柱状シリコン層上部においてシリサイド層が過剰に形成され、シリサイド層がソース拡散層の接合部に近づくと、接合リークを増加させる要因になるため、シリサイド層が過剰に形成されないよう制御する必要がある。第3に、次工程のイオン注入時において、High-k膜107が上記窒化膜125により覆われるので、後工程におけるHigh-k膜へのウェット処理によるダメージや、不純物注入によるダメージを防ぐことができる。
したがって、この保護のためのシリコン窒化膜の形成工程は、過剰なシリサイド化防止とダメージ防止の目的を含むので、その一方の過剰なシリサイド化を防止のために、後述のイオン注入工程の後且つソースドレイン表面のシリサイド化工程の前に行うこともできる。
図43は本発明を用いたCMOSインバーターの等価回路である。CMOSインバーターの回路動作は実施例2と同様であるので、ここでは省略する。
図44は本発明を用いたCMOSインバーターの平面図である。図45(a)、(b)は図44におけるカットラインA-A’とB-B’の断面図である。
本実施例において実施例2と異なる点は、本実施例においてはPMOSであるQp41、Qp42を形成している隣接する2つの柱状シリコン層(306a、306b)上部のソース拡散層が共通の長方形コンタクト316cにより接続されている点である。特に、隣接する柱状シリコン層の間隔が最小コンタクト寸法より小さい場合には、すべての柱状シリコン層上部に通常のコンタクトを形成することは困難であるが、この方法により容易にコンタクトを形成することができる。その他の構成については実施例2の場合と同様であるので、ここでは省略する。
図46に本実施例におけるCMOSインバーターの平面図を示す。図46(a)では、NMOSであるQn51とPMOSであるQp51およびQp52のゲート408および408a、408bをゲート配線408eにより接続して、ゲートへのコンタクトを削減することにより、インバーターの占有面積を縮小している。さらに、ドレイン拡散層とゲートの寄生容量を低減するために、ゲート配線408eと平面状シリコン層402の対向面積がなるべく小さくなるように、ゲート配線408eは埋め込み酸化膜401上に形成されるように平面状シリコン層402の形状を変更している。
埋め込み酸化膜層501上に平面状シリコン層502が形成され、平面状シリコン層502はN+ドレイン拡散層503からなり、N+ドレイン拡散層503の表面にはドレイン拡散層抵抗を下げるためにシリサイド層511が形成されている。N+ドレイン拡散層503上に形成される柱状シリコン層505によってNMOS駆動トランジスタQD1が形成され、同様にN+ドレイン拡散層503上に形成される柱状シリコン層506によってNMOS負荷トランジスタQL1が形成されている。柱状シリコン層(505、506)を取り囲むようにHfO2などのHigh-k膜によりゲート絶縁膜507が形成され、TaNやTiNなどの金属膜によりゲート電極(508a、508b)が形成されている。
駆動NMOSを形成する柱状シリコン層505の上部にN+ソース拡散層509aが、負荷NMOSを形成する柱状シリコン層506の上部にN+ソース拡散層509bが形成される。それぞれのソース拡散層上にはシリサイド膜512が形成されている。これらの素子を覆うようにコンタクトストッパーとしてシリコン窒化膜513が形成され、さらにシリコン窒化膜513上に層間シリコン酸化膜514が形成され、平坦化されたシリコン酸化膜514を貫通するようにコンタクト(515、516、517a、527、)が形成されている。
埋め込み酸化膜層601上に平面状シリコン層602が形成され、平面状シリコン層602はN+ドレイン拡散層603からなり、N+ドレイン拡散層603の表面にはドレイン拡散層抵抗を下げるためにシリサイド層611が形成されている。N+ドレイン拡散層603上に形成される柱状シリコン層605によってNMOS駆動トランジスタQD2が形成され、同様にN+ドレイン拡散層603上に形成される柱状シリコン層606によってNMOS負荷トランジスタQL2が形成されている。柱状シリコン層(605、606)を取り囲むようにHfO2などのHigh-k膜によりゲート絶縁膜607が形成され、それを取り囲むようにTaNやTiNなどの金属膜によりゲート電極(608a、608b)が形成されている。駆動NMOSを形成する柱状シリコン層605の上部にN+ソース拡散層609aが、負荷NMOSを形成する柱状シリコン層606の上部にN+ソース拡散層609bが形成される。それぞれのソース拡散層上にはシリサイド膜612が形成されている。これらの素子を覆うようにコンタクトストッパーとしてシリコン窒化膜613が形成され、さらにシリコン窒化膜613上に層間シリコン酸化膜614が形成され、平坦化されたシリコン酸化膜614を貫通するようにコンタクト(616、616a、617a、6128)が形成されている。
図56に示されるように、ゲート絶縁膜としてHfO2などのHigh-k膜7をCVD法もしくはALD法により1~5nm程度の厚さで成膜した後、ゲート導電膜としてTiNやTaNなどの金属膜729を100~400nm程度の厚さで成膜する。成膜においては、被覆性が要求される初期段階においては、CVD法やALD法によって成膜を行い、その後成膜レートの早いスパッタにより成膜を行うことにより効率よく成膜を行うことができる。
第1に、ゲート電極(708、708a、708b)と柱状シリコン層上部、およびゲート電極(708、708a、708b)とドレイン拡散層(703、704)が窒化膜725により分離されるため、過剰に形成されたシリサイドによるゲート電極と柱状シリコン層上部間のショート、およびゲート電極とドレイン拡散層間のショートを防止できる。
第2に、柱状シリコン上部の側壁を窒化膜で覆うことにより、図67のシリサイド化工程において、柱状シリコン層の側壁から過剰にシリサイド化するのを防ぐことができる。柱状シリコン層上部においてシリサイド層が過剰に形成され、シリサイド層がソース拡散層の接合部に近づくと、接合リークを増加させる要因になるため、シリサイド層が過剰に形成されないよう制御する必要がある。第3に、次工程のイオン注入時において、High-k膜707が上記窒化膜725により覆われるので、後工程におけるHigh-k膜へのウェット処理によるダメージや、不純物注入によるダメージを防ぐことができる。
図73に示されるように、柱状シリコン層を犠牲酸化し、チャネル部になる柱状シリコン層表面を平坦化する。犠牲酸化膜819は不純物注入時のスルー酸化膜として用いることもできる。
第2に、柱状シリコン上部の側壁を窒化膜で覆うことにより、図89のシリサイド化工程において、柱状シリコン層の側壁から過剰にシリサイド化するのを防ぐことができる。柱状シリコン層上部においてシリサイド層が過剰に形成され、シリサイド層がソース拡散層の接合部に近づくと、接合リークを増加させる要因になるため、シリサイド層が過剰に形成されないよう制御する必要がある。第3に、次工程のイオン注入時において、High-k膜807が上記窒化膜825により覆われるので、後工程におけるHigh-k膜へのウェット処理によるダメージや、不純物注入によるダメージを防ぐことができる。
図92は本発明を用いたCMOSインバーターの平面図である。図93(a)、(b)は図92におけるカットラインA-A’とB-B’の断面図である。本実施例においては、柱状シリコン層を取り囲むゲート電極(908、908a、908b)とこれらのゲート電極より延在するゲート配線(908c、908d)の上面の高さが同一である特徴を持ち、すなわち、ゲート電極とゲート配線が一体的に形成され、その一体的に形成されたゲート電極およびゲート配線の上面全面が基板に平行な面に形成され、さらにゲート電極(908、908a、908b)やゲート配線(908c、908d)とドレイン拡散層(903、904)との間にシリコン酸化膜などの絶縁膜920が存在する特徴を持つ。
まず、実施例8の製造方法(図73~図77)において示さるように、柱状シリコン層の形成後、柱状シリコン層を埋め込むようにシリコン酸化膜を成膜し、続いてシリコン酸化膜をCMPにより平坦化し、続いてシリコン酸化膜をエッチバックすることにより、所望の膜厚だけドレイン拡散層にシリコン酸化膜を形成する。
その後、実施例7の製造方法(図56~図69)おいてに示されたと同様にして、柱状シリコン層の形成後に柱状シリコン層を埋め込むようにゲート導電膜を成膜し、続いてゲート導電膜をCMPにより平坦化し、続いてゲート導電膜をエッチバックし、続いてゲート電極膜厚を決めるためのシリコン窒化膜を成膜及びエッチバックしてゲート電極を自己整合的に形成するためのシリコン窒化膜サイドウォールを形成し、続いてゲート配線パターンのリソグラフィー及びエッチングを行うことにより、ゲート電極とゲート電極より延在するゲート配線が一体的に形成され、その一体的に形成されたゲート電極及びゲート配線の上面全面が基板に平行な面に形成されているゲート電極構造を形成する。さらにその後、柱状シリコン層の側壁を保護するためのシリコン窒化膜を形成し、続いて柱状シリコン層上部の拡散層を形成し、続いて平面状シリコン層表面及び柱状シリコン層上部にシリサイド層を形成し、続いてコンタクトを形成する。
ゲート導電膜の成膜工程までは実施例2の製造工程と同一であるので、ゲート導電膜の成膜工程より以下に示す。
図112は本発明を用いたCMOSインバーターの平面図である。図113(a)、(b)は図112におけるカットラインA-A’とB-B’の断面図である。本実施例においては、柱状シリコン層を取り囲むゲート電極(1108、1108a、1108b)とこれらのゲート電極より延在するゲート配線(1108c、1108d)の上面の高さが同一である特徴を持ち、すなわち、ゲート電極とゲート配線が一体的に形成され、その一体的に形成されたゲート電極およびゲート配線の上面全面が基板に平行な面に形成される。また、ゲート電極およびゲート配線は薄い金属膜とポリシリコンの積層構造からなる。さらに、ゲート電極(1108、1108a、1108b)やゲート配線(1108c、1108d)とドレイン拡散層(1103、1104)との間にシリコン酸化膜などの絶縁膜1120が存在する特徴を持つ。
まず、実施例8の製造方法(図73~図77)において示さるように、柱状シリコン層の形成後、柱状シリコン層を埋め込むようにシリコン酸化膜を成膜し、続いてシリコン酸化膜をCMPにより平坦化し、続いてシリコン酸化膜をエッチバックすることにより、所望の膜厚だけドレイン拡散層にシリコン酸化膜を形成し、ゲート電極とゲート電極間の寄生容量を低減するインバーター構造を形成する。
その後、実施例10の製造方法(図97~図110)おいてに示されたと同様にして、柱状シリコン層の形成後に柱状シリコン層を埋め込むように薄い金属膜とポリシリコンの積層構造よりなるゲート導電膜を成膜し、続いてゲート導電膜をCMPにより平坦化し、続いてゲート導電膜をエッチバックし、続いてゲート電極膜厚を決めるためのシリコン窒化膜を成膜及びエッチバックしてゲート電極を自己整合的に形成するためのシリコン窒化膜サイドウォールを形成し、続いてゲート配線パターンのリソグラフィー及びエッチングを行うことにより、薄い金属膜とポリシリコン膜の積層構造よりなるゲート電極とゲート電極より延在するゲート配線が一体的に形成され、その一体的に形成されたゲート電極及びゲート配線の上面全面が基板に平行な面に形成されているゲート電極構造を形成する。さらにその後、柱状シリコン層の側壁を保護するためのシリコン窒化膜を形成し、続いて柱状シリコン層上部の拡散層を形成し、続いて平面状シリコン層表面及び柱状シリコン層上部にシリサイド層を形成し、続いてコンタクトを形成する。
さらに、SGTを形成する場合、製造工程削減のため柱状半導体層の上部と下部の拡散層上に同時にコンタクトを形成することが望ましいが、その場合、柱状半導体層上部に形成されるコンタクトに対しては、柱状半導体層下部に形成されるコンタクトと比べると、柱状半導体層の高さ以上のオーバーエッチが行われる。このため、柱状シリコン層上部に形成されるコンタクトにおいて、コンタクトエッチング時にオーバーエッチが過剰に行われることにより、ゲートとコンタクト間のショートが生じやすい構造になる。
埋め込み酸化膜層1200の上に平面状シリコン層が形成され、平面状シリコン層は下部N+拡散層1201および下部P+拡散層1211からなり、下部N+拡散層1201と下部P+拡散層1211の表面には下部エピタキシャルシリコン層1202が形成され、その表面には下部シリサイド層1203が形成され、この下部シリサイド層1203によって下部N+拡散層1201と下部P+拡散層1211は互いに直接接続されている。下部N+拡散層1201上に形成される柱状シリコン層1204によってNMOSトランジスタQn131が形成され、下部P+拡散層1211上に形成される柱状シリコン層1214aおよび1214bによってPMOSトランジスタQp131がおよびQp132が形成されている。柱状シリコン層(1204、1214a、1214b)を取り囲むようにゲート絶縁膜1207が形成され、それを取り囲むようにゲート電極1208が形成されている。柱状シリコン層上部には上部エピタキシャルシリコン層(1205、1215)が形成され、第1の絶縁膜1210を介してゲート電極1208と絶縁されている。一定間隔以下で隣接する柱状シリコン層(1214a、1214b)の上部に形成されるエピタキシャルシリコン層は互いに接続される。NMOSであるQn121上に形成される上部エピタキシャルシリコン層1205は上部N+拡散層であり、PMOSであるQp121およびQp122上に形成される上部エピタキシャルシリコン層1215は上部P+拡散層1215であり、それぞれの上部エピタキシャルシリコン層上にはソースドレイン領域の寄生抵抗低減のため上部シリサイド層1206が形成されている。柱状シリコン層の径が小さい場合には柱状シリコン層上部においてシリサイド層と拡散層の界面抵抗はソースドレイン寄生抵抗の主要因になるため、両者の界面の面積はなるべく大きいことが望ましい。上部シリサイド層1206は上部エピタキシャルシリコン層の表面に形成されるように設定することにより、シリサイド層と拡散層の界面の面積が大きくなり、界面抵抗は減少する。柱状シリコン層上部のエピタキシャルシリコン層(1205、1215)上に形成されるコンタクト(1209d、1209e)は完全にエピタキシャルシリコン層上に形成される。コンタクトエッチングにおいてはエピタキシャルシリコン層やその表面に形成されるシリサイド層とシリコン酸化膜の選択比が大きい条件を用いるため、コンタクトの形成時にオーバーエッチが行われても、エピタキシャルシリコン層やシリサイド層はほとんどエッチングされないため、コンタクトとゲート間のショートは発生しない。
上部シリサイド層と上部拡散層の界面の抵抗に関して、エピタキシャルシリコン層(1205、1215)がない場合には、上部シリサイド層1206と上部拡散層の接触面積が柱状シリコン層上面の面積しかないが、図116においては上部シリサイド層1206とエピタキシャルシリコン層である上部拡散層(1205、1215)の接触面積は柱状シリコン層の上面の面積より大きいエピタキシャルシリコン層の面積になるので、接触抵抗は小さくなる。さらに、図116のPMOSのようにエピタキシャルシリコン層が複数の柱状シリコン層間で接続されている場合には、1個の柱状シリコン層あたりのシリサイド層と上部拡散層との界面抵抗はさらに小さくなる。このため、エピタキシャルシリコン層を形成することによって、ソースドレイン寄生抵抗の主要因であるシリサイド層と上部拡散層の接触抵抗が大幅に減少するため、SGTの性能を向上することができる。
第1に、柱状シリコン層上部のコンタクト抵抗に関して、エピタキシャルシリコン層(1205、1215)がない場合には、コンタクトの接触面積はコンタクトより小さい柱状シリコン層上部の大きさにより決まる。一方、図116のSGT構造のようにコンタクトより柱状シリコン層上部の面積が小さい場合には、コンタクトの接触面積は柱状シリコン層上部の大きさにより決まる。このため、柱状シリコン層がコンタクトより小さい場合には、エピタキシャルシリコン層を形成して、コンタクト寸法より柱状シリコン層上部の寸法を大きくすることにより、柱状シリコン層上部に形成されるコンタクトのコンタクト抵抗を低減することができる。
以上のように、本実施例を用いることにより従来のSGTに比べて、コンタクト抵抗の低減、ソースドレイン寄生抵抗の低減、コンタクトとゲート間ショートの抑制が実現できる。
2、102、202、302、402、452、502、602、702、802、902、1002、1102:平面状シリコン層
3、103、203、303、503、603、703、803、903、1003、1103、1201、1312、1503、1507、1523、1527、1542、1545、1562、1565、1572:N+ドレイン拡散層
4、104、204、304、704、804、904、1004、1104、1211、1310、1504、1508、1524、1528、1546、1562、1566、1573:P+ドレイン拡散層
5、105、205、305、505、605、705、805、905、1005、1105、1204、1510、1530、1548、1568、1575、1606、1509、1529、1547、1567、1574:NMOS柱状シリコン層
6a、106a、206a、306a、706a、806a、906a、1006a、1106a、1214a、6b、106b、206b、306b、706b、806b、906b、1006b、1106b、1214b、1305、1510、1530、1548、1568、1575:PMOS柱状シリコン層
505、605:駆動NMOS柱状シリコン層
506、606:負荷NMOS柱状シリコン層
7、107、207、307、507、607、707、807、907、1007、1107、1207:ゲート絶縁膜
8、108、208、308、408、458、708、808、908、1008、1108:NMOSゲート電極
8a、108a、208a、308a、408a、458a、708a、808a、908a、1008a、1108a、8b、108b、208b、308b、408b、458b、708b、808b、908b、1008b、1108b:PMOSゲート電極
8c、108c、208c、308c,508c、608c、708c、808c、908c、1008c、1108c、8d、108d、208d、308d、408d、708d、808d、908d、1008d、1108d、408e、458e:ゲート配線
508a、608a:駆動NMOSゲート電極
508b、608b:負荷NMOSゲート電極
9、109、209、309、509a、609a、509b、609b、709、809、909、1009、1109、1205、1311、1511、1531、1549、1511、1531、1549、1569、1576:N+ソース拡散層
10a、110a、210a、310a、710a、810a、910a、1010a、1110a、10b、110b、210b、310b、710b、810b、910b、1010b、1110b、1215、1309、1512、1532、1550、1570、1577:P+ソース拡散層
11、111、211、311、511、611、711、811、911、1011、1111、1203:ドレイン部シリサイド
12、112、212、312、512、612、712、812、912、1012、1112、1206:ソース部シリサイド
1210:第1の絶縁膜
13、113、213、312、513、613、713、813、913、1013、1113:シリコン窒化膜
14、114、214、314、514、614、714、814、914、1014、1114:シリコン酸化膜
15、115、215、315、415、465、515、715、815、915、1015、1115、1209c:ドレイン拡散層上コンタクト
16、116、216、316、416、466、516、616、616a、716、816、916、1016、1116、1209d:NMOSソース拡散層上コンタクト
16a、116a、216c、316a、416a、466a、716a、816a、916a、1016a、1116a、16b、116b、216b、416b、466b、716b、816b、916b、1016b、1116b、1209e:PMOSソース拡散層上コンタクト
316c:長方形形状コンタクト
17a、117a、217a、317c、417c、467c、517a、617a、717a、817a、917a、1017a、1117a、17b、117b、217b、317b、717b、817b、917b、1017b、1117b、1209a、1209b:ゲート上コンタクト
18、718、818、1018:シリコン窒化膜ハードマスク
19、819:犠牲酸化膜
20:注入用レジスト
40:シリサイド領域形成用レジスト
21、821:シリコン酸化膜
22、722、822、1022:ゲート形成用シリコン窒化膜
23、723、823、1023:シリコン窒化膜サイドウォール
24、724、824、1024:ゲートレジスト
25、725、825、1025:シリコン窒化膜
527:ソースゲート共通コンタクト
628:ドレインゲート共通コンタクト
80、729、880:ゲート導電膜
30a、130a、230a、330a、530a、630a、730a、830a、930a、1030a、1130a、30b、130b、230b、330b、430b、530b、630b、730b、830b、930b、1030b、1130b:入力端子用配線
31、131、231、331、431、531、631、731、831、931、1031、1131:出力端子用配線
32、132、232、332、432、532、632、732、832、932、1032、1132:接地配線
33、133、233、333、433、533、633、733、833、933、1033、1133:電源配線
1029、1129:ポリシリコン膜
1030、1130:薄い金属膜
1031、1131:ゲート上シリサイド
1223、1224:エピタキシャルシリコン層
1301:シリコン基板
1302、1302、1502、1522:Nウェル
1303、1501、1521、1541:Pウェル
1304、1505、1525、1551:LOCOS
1308、1506、1526、1544、1564、1578:ゲート電極
Qn11、Qn21、Qn31、Qn41、Qn51、Qn81、Qn91、Qn101、Qn111、Qn121、Qn131:NMOSトランジスタ
Qp11、Qp21、Qp31、Qp41、Qp51、Qp81、Qp91、Qp101、Qp111、Qp121、Qp131、Qp12、Qp22、Qp32、Qp42、Qp52、Qp82、Qp92、Qp102、Qp112、Qp122、Qp132:PMOSトランジスタ
QD1、QD2:駆動NMOSトランジスタ
QL1、QL2:負荷NMOSトランジスタ
1401、1411、1421、1607:柱状シリコン層
1405、1415、1425:ゲート配線
1404、1414、1424:ゲート配線用レジスト
1402、1412、1422、1605:ゲート絶縁膜
1403、1413、1423:ゲート電極
1601、1603:シリコン酸化膜
1602:ゲート導電体
1604:コンタクトホール
Claims (85)
- 第1のMOSトランジスタのドレイン又はソースのいずれかと、第2のMOSトランジスタのドレイン又はソースのいずれかが接続される回路を備えた半導体装置であって、
基板と、
前記基板上の絶縁膜と、
前記基板上の絶縁膜上に形成された平面状半導体層と、
を備え、
前記第1のMOSトランジスタは、前記平面状半導体層に形成された第1ドレイン/ソース領域、該平面状半導体層上に形成された柱状半導体層、該柱状半導体上部に形成された第2ソース/ドレイン領域、及び該柱状半導体層の側壁に形成されたゲートを含み、
前記第2のMOSトランジスタは、前記平面状半導体層に形成された第3ドレイン/ソース領域、該平面状半導体層上に形成された柱状半導体層、該柱状半導体上部に形成された第4ソース/ドレイン領域、及び該柱状半導体層の側壁に形成されたゲートを含み、
前記第1ドレイン/ソース領域の表面の少なくとも一部と第3ドレイン/ソース領域の表面の少なくとも一部とを接続するシリサイド層が形成されていることを特徴とする半導体装置。 - 前記第1ドレイン/ソース領域と前記第3ドレイン/ソース領域を含む平面状半導体層表面の全面に、前記シリサイド層が形成されていることを特徴とする請求項1に記載の半導体装置。
- 前記シリサイド層上にコンタクトが形成されたことを特徴とする請求項1又は2に記載の半導体装置。
- 前記第1のMOSトランジスタ及び前記第2のMOSトランジスタは異なる導電型のMOSトランジスタであることを特徴とする請求項1ないし3のいずれか1項に記載の半導体装置。
- 第1のMOSトランジスタのドレイン又はソースのいずれかと、第2のMOSトランジスタのドレイン又はソースのいずれかが接続される回路を備えた半導体装置であって、
基板と、
前記基板上の絶縁膜と、
前記基板上の絶縁膜上に形成された平面状半導体層と、
を備え、
前記第1のMOSトランジスタは、前記平面状半導体層に形成された第1ドレイン/ソース領域、該平面状半導体層上に形成された柱状半導体層、該柱状半導体上部に形成された第2ソース/ドレイン領域、及び該柱状半導体層の側壁に形成されたゲートを含み、
前記第2のMOSトランジスタは、前記平面状半導体層に形成された第3ドレイン/ソース領域、該平面状半導体層上に形成された柱状半導体層、該柱状半導体上部に形成された第4ソース/ドレイン領域、及び該柱状半導体層の側壁に形成されたゲートを含み、
前記第1のMOSトランジスタ及び前記第2のMOSトランジスタは異なる導電型のMOSトランジスタであって、互いに隣接して配置され、
前記第1ドレイン/ソース領域と前記第3ドレイン/ソース領域との隣接境界部の平面状半導体層の上部にコンタクトが形成されたことを特徴とする半導体装置。 - 前記第1のMOSトランジスタと第2のMOSトランジスタは隣接して配置されていることを特徴とする請求項4又は5に記載の半導体装置。
- 前記ゲート電極からコンタクトへ延びる少なくとも1つのゲート配線は、前記第1ドレイン/ソース領域又は前記第3ドレイン/ソース領域に沿って延びる部分、及び前記基板上の絶縁膜に沿って延びる部分の両方の部分を含むことを特徴とする請求項1ないし3、5のいずれか1項に記載の半導体装置。
- 前記ゲート配線が沿う第1ドレイン/ソース領域又は前記第3ドレイン/ソース領域ドレイン拡散領域は、前記柱状半導体層近傍にその端面を有することを特徴とする請求項7に記載の半導体装置。
- 前記第1のMOSトランジスタと前記第2のMOSトランジスタのゲート電極同士がゲート配線により接続され、該ゲート配線が配置される部分に相当する部分の一部を含む前記第1ドレイン/ソース領域又は前記第3ドレイン/ソース領域の一部が除去され、前記ゲート配線は、前記除去されたドレイン/ソース領域の側面及び該除去されたドレイン/ソース領域の下部の基板上の絶縁膜に沿って配置されることを特徴とする請求項1ないし3、5のいずれか1項に記載の半導体装置。
- 前記回路は、CMOSインバータであり、
前記第1のMOSトランジスタと前記第2のMOSトランジスタのゲート電極同士が、該ゲート電極から基板側へ延びるゲート配線により接続されていることを特徴とする請求項4又は5に記載の半導体装置。 - 前記ゲート電極同士が接続された、第1のMOSトランジスタ及び第2のMOSトランジスタのゲート電極に対するコンタクトが、前記第1のMOSトランジスタの柱状半導体層と前記第2のMOSトランジスタの柱状半導体層の間に形成されていることを特徴とする請求項10に記載の半導体装置。
- 前記コンタクトが形成される、前記第1のMOSトランジスタの柱状半導体層と前記第2のMOSトランジスタの柱状半導体層の間は、前記第1ドレイン/ソース領域と前記第3ドレイン/ソース領域との隣接境界部であることを特徴とする請求項11に記載の半導体装置。
- 前記ゲート配線が配置される部分に相当する部分の一部を含む前記第1ドレイン/ソース領域又は前記第3ドレイン/ソース領域の一部が除去され、前記ゲート配線は、前記除去されたドレイン/ソース領域の側面及び該除去されたドレイン/ソース領域の下部の前記基板上の絶縁膜に沿って配置されることを特徴とする請求項11又は12に記載の半導体装置。
- 前記コンタクトが形成される位置は、更に前記除去されたドレイン/ソース領域の上部でもあることを特徴とする請求項13に記載の半導体装置。
- 前記ゲート配線が配置される部分に相当する部分の一部を含む前記第1ドレイン/ソース領域又は前記第3ドレイン/ソース領域の一部が除去され、前記ゲート配線は、前記除去されたドレイン/ソース領域の側面及び該除去されたドレイン/ソース領域の下部の前記基板上の絶縁膜に沿って配置されることを特徴とする請求項10に記載の半導体装置。
- 前記ゲート電極はゲート配線と一体的に形成され、該一体的に形成されたゲート電極及びゲート配線の上面全面が基板に平行な面に形成され、ゲート電極に対するコンタクトが該基板に平行な面に形成された上面において接するように設けられていることを特徴とする請求項1ないし3、5のいずれか1項に記載の半導体装置。
- 前記ゲート電極及び該ゲート電極から基板側へ延びるゲート配線の下に形成された第1の絶縁膜と前記平面状半導体層及び前記基板上の絶縁膜との間に第2の絶縁膜が介在することを特徴とする請求項1ないし3、5のいずれか1項に記載の半導体装置。
- 前記第2の絶縁膜は、前記第1の絶縁膜よりも比誘電率が小さいことを特徴とする請求項17に記載の半導体装置。
- 前記ゲート電極は、薄い金属膜とポリシリコン層の積層構造で形成され、該ゲート電極はゲート配線と一体的に形成され、該一体的に形成されたゲート電極及びゲート配線の上面全面が基板に平行な面に形成され、前記ゲート電極に対するコンタクトが該基板に平行な面に形成されたゲート電極の上面において接するように設けられており、前記薄い金属膜は、前記ポリシリコン層と前記柱状半導体層、前記第1ドレイン/ソース領域、前記第3ドレイン/ソース領域、及び前記基板上の絶縁膜上に形成された絶縁膜との間にあることを特徴とする請求項1ないし3、5のいずれか1項に記載の半導体装置。
- 前記一体的に形成されたゲート電極及びゲート配線の下に形成された第1の絶縁膜と前記平面状半導体層及び前記基板上の絶縁膜との間に第2の絶縁膜が介在することを特徴とする請求項16又は19に記載の半導体装置。
- 前記第2の絶縁膜は、前記第1の絶縁膜よりも比誘電率が小さいことを特徴とする請求項20に記載の半導体装置。
- 第1のMOSトランジスタのドレイン又はソースのいずれかと、第2のMOSトランジスタのドレイン又はソースのいずれかが接続される回路を備えた半導体装置であって、
基板と、
前記基板上の絶縁膜と、
前記基板上の絶縁膜上に形成された平面状半導体層と、
を備え、
前記第1のMOSトランジスタは、前記平面状半導体層に形成された第1ドレイン/ソース領域、該平面状半導体層上に形成された柱状半導体層、該柱状半導体上面に形成された第2ソース/ドレイン領域、及び該柱状半導体層の側壁に形成されたゲートを含み、
前記第2のMOSトランジスタは、前記平面上半導体層に形成された第3ドレイン/ソース領域、該平面状半導体層上に形成された柱状半導体層、該柱状半導体上面に形成された第4ソース/ドレイン領域、及び該柱状半導体層の側壁に形成されたゲートを含み、
前記柱状半導体上面に形成された第2ソース/ドレイン領域又は前記柱状半導体上面に形成された第4ソース/ドレイン領域の上面の大きさは、前記柱状半導体層の上面の大きさよりも大きく、
前記第1のMOSトランジスタの第1ドレイン/ソース領域の上部の少なくとも一部と前記第2のMOSトランジスタの第3ドレイン/ソース領域の上部の少なくとも一部とを接続するシリサイド層が形成されていることを特徴とする半導体装置。 - 前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域の表面には、シリサイド層が形成されていることを特徴とする請求項22に記載の半導体装置。
- 前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域の表面に形成されたシリサイド層の大きさは、前記柱状半導体層の上面の大きさよりも大きいことを特徴とする請求項23に記載の半導体装置。
- 前記柱状半導体層上面に形成された第2ソース/ドレイン領域又は前記柱状半導体層上面に形成された第4ソース/ドレイン領域の上面上には、第1のコンタクト又は第2のコンタクトがそれぞれ形成され、
前記柱状半導体上面に形成された第2ソース/ドレイン領域又は前記柱状半導体上面に形成された第4ソース/ドレイン領域の上面の大きさはそれぞれ、前記第1のコンタクト又は第2のコンタクトの底面の大きさよりも大きく、
前記第1のコンタクト又は第2のコンタクトの底面の大きさが、前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域が上面に形成された柱状半導体層それぞれの上面の大きさよりも大きいことを特徴とする請求項22に記載の半導体装置。 - 前記第2ソース/ドレイン領域又は前記第4ソース/ドレイン領域は、第4の絶縁膜を介してゲート電極の上部を覆うように形成されていることを特徴とする請求項22に記載の半導体装置。
- 前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域の表面にシリサイド層が形成されていることを特徴とする請求項25又は26に記載の半導体装置。
- 前記第1のMOSトランジスタと前記第2のMOSトランジスタのいずれか一方又は両方はそれぞれ、複数の柱状半導体層から構成され、該複数の柱状半導体層上面上部に前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域が一体的に形成されていることを特徴とする請求項22ないし27のいずれか1項に記載の半導体装置。
- 前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域は、エピタキシャル層であることを特徴とする請求項22ないし27のいずれか1項に記載の半導体装置。
- 前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域は、n型の場合にはエピタキシャルシリコン層であり、前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域は、p型の場合にはエピタキシャルゲルマニウム層であることを特徴とする請求項29に記載の半導体装置。
- 前記第1のMOSトランジスタと前記第2のMOSトランジスタのいずれか一方又は両方はそれぞれ、複数の柱状半導体層から構成され、該複数の柱状半導体層の少なくとも2以上の柱状半導体層上面上部に前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域が一体的に形成されていることを特徴とする請求項29又は30に記載の半導体装置。
- 所定の間隔以下で隣接する、前記第1のMOSトランジスタ又は前記第2のMOSトランジスタを構成する複数の柱状半導体層に対してのみ、該複数の柱状半導体層上面上部に前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域が一体的に形成されていることを特徴とする請求項31に記載の半導体装置。
- 前記第2ソース/ドレイン領域の側壁、前記第4ソース/ドレイン領域の側壁、又は前記ゲート電極がシリコン窒化膜で覆われていることを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 前記シリコン窒化膜は応力を有し、前記柱状半導体層のチャネル部に応力を与えることを特徴とする請求項33に記載の半導体装置。
- 前記平面状半導体層は薄く形成され、前記シリサイド層の厚さは前記平面状半導体層の厚さよりも小さく形成されていることを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 前記シリサイド層が前記基板上の絶縁膜上まで形成されていることを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 前記第2ソース/ドレイン領域又は前記第4ソース/ドレイン領域の上面にシリサイド層が形成されたことを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 前記第1のMOSトランジスタと前記第2のMOSトランジスタのいずれか一方又は両方はそれぞれ、複数の柱状半導体層から構成され、少なくとも2つの該複数の柱状半導体層の前記第2ソース/ドレイン拡散領域、又は少なくとも2つの該複数の柱状半導体層の前記第4ソース/ドレイン拡散領域の上面上に形成されるコンタクトを共通のコンタクトとしたことを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 前記第2ソース/ドレイン領域又は第4ソース/ドレイン領域の上部に形成されるコンタクトと、前記ゲートに対するコンタクトとを共通のコンタクトとしたことを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 前記第1のMOSトランジスタの柱状半導体層と前記第2のMOSトランジスタの柱状半導体層との間に設けられるコンタクトと、前記第1のMOSトランジスタ又は第2のMOSトランジスタのゲートに対するコンタクトとを共通のコンタクトとしたことを特徴とする請求項1ないし32のいずれか1項に記載の半導体装置。
- 基板上の絶縁膜上に平面状半導体層及び複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に導電膜を形成する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程と、
前記導電膜及び前記第1の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程は、
前記導電膜上に、前記柱状半導体層が埋没するように第2の絶縁膜を形成する工程と、
前記第2の絶縁膜上面を平坦化する工程と、
前記第1の絶縁膜、前記導電膜及び前記第2の絶縁膜を異方的に除去し、前記柱状半導体層側面の前記導電膜の所望の長さに形成し、ゲート電極を形成する工程と、
を含むことを特徴とする請求項41に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層及び該複数の柱状半導体層上のストッパー膜を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に導電膜を形成する工程と、
前記導電膜上に、前記柱状半導体層が埋没するように第2の絶縁膜を形成する工程と、
その後に上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第1の絶縁膜、前記第2の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記第1の絶縁膜、前記第2の絶縁膜及び前記導電膜を所望の長さに形成し、ゲート電極を形成する工程と、
前記第2の絶縁膜を除去する工程と、
前記導電膜及び前記第1の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記導電膜及び前記第1の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程は、
前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程の後に表面の少なくとも一部に第1の保護膜を形成する工程と、
前記第1の保護膜を異方的に除去し、前記所望の長さに形成された柱状半導体層側面の導電膜及び第1の絶縁膜の上部に所望の膜厚の第1の保護膜サイドウォールを形成する工程と、
前記第1の保護膜サイドウォールによって前記所望の長さに形成された柱状半導体層側面の導電膜及び第1の絶縁膜を保護しつつ、前記導電膜及び前記第1の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
を含むことを特徴とする請求項41ないし43のいずれか1項に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に、前記柱状半導体層が埋没するように導電膜を形成する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記第1の絶縁膜及び前記導電膜を所望の高さに形成する工程と、
前記導電膜及び前記第1の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記第1の絶縁膜及び前記導電膜を所望の高さに形成する工程の前処理工程として、前記導電膜上面を平坦化する工程を更に含むことを特徴とする請求項45に記載の半導体装置の製造方法。
- 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層及び該複数の柱状半導体層上のストッパー膜を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に、前記柱状半導体層が埋没するように導電膜を形成する工程と、
その後に上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記第1の絶縁膜及び前記導電膜を所望の高さに形成する工程と、
前記導電膜及び前記第1の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記導電膜及び前記第1の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程は、
表面に第1の保護膜を形成する工程と、
前記第1の保護膜を異方的に除去し、前記所望の長さに形成された柱状半導体層側面の前記導電膜及び前記第1の絶縁膜の上部に所望の膜厚の第1の保護膜サイドウォールを形成する工程と、
前記導電膜及び前記第1の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成し、前記第1の保護膜サイドウォールの保護によって、前記一体化したゲート電極及びゲート配線の少なくとも一部を前記所望の膜厚に形成する工程と、
を含むことを特徴とする請求項45ないし47のいずれか1項に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層及び複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
前記平面状半導体層及び前記基板上の絶縁膜上に、前記柱状半導体層側壁に形成されるゲート電極下端付近の高さまで第3の絶縁膜を形成する工程と、
前記柱状半導体層及び前記第3の絶縁膜上に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に導電膜を形成する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程と、
前記導電膜、前記第1の絶縁膜及び前記第3の絶縁膜を選択的に除去し、前記ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記平面状半導体層及び前記基板上の絶縁膜上に、前記柱状半導体層側壁に形成されるゲート電極下端付近の高さまで第3の絶縁膜を形成する工程は、
前記基板上の絶縁膜及び前記平面上半導体層上に、前記柱状半導体層が埋没するように第3の絶縁膜を形成する工程と、
前記第3の絶縁膜上面を平坦化する工程と、
前記第3の絶縁膜を異方的に除去し、第3の絶縁膜を前記柱状半導体層側壁に形成されるゲート電極下端付近の高さに形成する工程と、
を含むことを特徴とする請求項49に記載の半導体装置の製造方法。 - 前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程は、
前記導電膜上に、前記柱状半導体層が埋没するように第2の絶縁膜を形成する工程と、
前記第2の絶縁膜上面を平坦化する工程と、
前記第1の絶縁膜、前記第2の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程と、
を含むことを特徴とする請求項49又は50に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層及び該複数の柱状半導体層上のストッパー膜を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
前記基板上の絶縁膜及び前記平面上半導体層上に、前記柱状半導体層が埋没するように第3の絶縁膜を形成する工程と、
上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第3の絶縁膜を異方的に除去し、第3の絶縁膜を前記柱状半導体層側壁に形成されるゲート電極下端付近の高さに形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に導電膜を形成する工程と、
前記導電膜上に、前記柱状半導体層が埋没するように第2の絶縁膜を形成する工程と、
上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第1の絶縁膜、前記第2の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程と、
前記第2の絶縁膜を除去する工程と、
前記導電膜、前記第1の絶縁膜及び前記第3の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記導電膜及び前記第1の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程は、
前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程の後に表面の少なくとも一部に第1の保護膜を形成する工程と、
前記第1の保護膜を異方的に除去し、前記所望の長さに形成された柱状半導体層側面の導電膜及び第1の絶縁膜の上部に所望の膜厚の第1の保護膜サイドウォールを形成する工程と、
前記第1の保護膜サイドウォールによって前記所望の長さに形成された柱状半導体層側面の導電膜及び第1の絶縁膜を保護しつつ、前記導電膜、前記第1の絶縁膜及び前記第3の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
を含むことを特徴とする請求項49ないし52のいずれか1項に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層及び複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
前記平面状半導体層及び前記基板上の絶縁膜上に、前記柱状半導体層側壁に形成されるゲート電極下端付近の高さまで第3の絶縁膜を形成する工程と、
前記柱状半導体層及び前記第3の絶縁膜上に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に、前記柱状半導体層が埋没するように導電膜を形成する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記第1の絶縁膜及び前記導電膜を所望の高さに形成する工程と、
前記導電膜、前記第1の絶縁膜及び前記第3の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記平面状半導体層及び前記基板上の絶縁膜上に、前記柱状半導体層側壁に形成されるゲート電極下端付近の高さまで第3の絶縁膜を形成する工程は、
前記基板上の絶縁膜及び前記平面上半導体層上に、前記柱状半導体層が埋没するように第3の絶縁膜を形成する工程と、
前記第3の絶縁膜上面を平坦化する工程と、
前記第3の絶縁膜を異方的に除去し、第3の絶縁膜を前記柱状半導体層側壁に形成されるゲート電極下端付近の高さに形成する工程と、
を含むことを特徴とする請求項54に記載の半導体装置の製造方法。 - 前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記第1の絶縁膜及び前記導電膜を所望の高さに形成する工程の前処理工程として、前記導電膜上面を平坦化する工程を更に含むことを特徴とする請求項54又は55に記載の半導体装置の製造方法。
- 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層及び該複数の柱状半導体層上のストッパー膜を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
前記基板上の絶縁膜及び前記平面上半導体層上に、前記柱状半導体層が埋没するように第3の絶縁膜を形成する工程と、
上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第3の絶縁膜を異方的に除去し、第3の絶縁膜を前記柱状半導体層側壁に形成されるゲート電極下端付近の高さに形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に導電膜を形成する工程と、
前記第1の絶縁膜上に、前記柱状半導体層が埋没するように導電膜を形成する工程と、
その後に上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記第1の絶縁膜及び前記導電膜を所望の高さに形成する工程と、
前記導電膜、前記第1の絶縁膜及び第3の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記導電膜及び前記第1の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程は、
表面に第1の保護膜を形成する工程と、
前記第1の保護膜を異方的に除去し、前記所望の長さに形成された柱状半導体層側面の前記導電膜及び前記第1の絶縁膜の上部に所望の膜厚の第1の保護膜サイドウォールを形成する工程と、
前記導電膜、前記第1の絶縁膜及び前記第3の絶縁膜を選択的に除去し、一体化したゲート電極及びゲート配線を形成し、前記第1の保護膜サイドウォールの保護によって、前記一体化したゲート電極及びゲート配線の少なくとも一部を前記所望の膜厚に形成する工程と、
を含むことを特徴とする請求項54ないし57のいずれか1項に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層及び複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に薄い導電膜を形成する工程と、
前記薄い導電膜上に、前記柱状半導体層が埋没するようにポリシリコン層を形成する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を異方的に除去し、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を所望の長さに形成する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記第1の絶縁膜、薄い導電膜及びポリシリコン層を異方的に除去し、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を所望の長さに形成する工程の前処理工程として、前記ポリシリコン層上面を平坦化する工程を更に含むことを特徴とする請求項59に記載の半導体装置の製造方法。
- 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層及び該複数の柱状半導体層上のストッパー膜を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に薄い導電膜を形成する工程と、
前記薄い導電膜上に、前記柱状半導体層が埋没するようにポリシリコン層を形成する工程と、
その後に上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を異方的に除去し、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を所望の長さに形成する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程は、
表面に第1の保護膜を形成する工程と、
前記第1の保護膜を異方的に除去し、前記所望の長さに形成された柱状半導体層側面の前記第1の絶縁膜、薄い導電膜及びポリシリコン層の上部に所望の膜厚の第1の保護膜サイドウォールを形成する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成し、前記第1の保護膜サイドウォールの保護によって、前記一体化したゲート電極及びゲート配線の少なくとも一部を前記所望の膜厚に形成する工程と、
を含むことを特徴とする請求項59ないし61のいずれか1項に記載の半導体装置の製造方法。 - 基板上の絶縁膜上に平面状半導体層及び複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
前記平面状半導体層及び前記基板上の絶縁膜上に、前記柱状半導体層側壁に形成されるゲート電極下端付近の高さまで第3の絶縁膜を形成する工程と、
前記柱状半導体層及び前記第3の絶縁膜上に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に薄い導電膜を形成する工程と、
前記薄い導電膜上に、前記柱状半導体層が埋没するようにポリシリコン層を形成する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を異方的に除去し、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を所望の長さに形成する工程と、
前記第3の絶縁膜、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記平面状半導体層及び前記基板上の絶縁膜上に、前記柱状半導体層側壁に形成されるゲート電極下端付近の高さまで第3の絶縁膜を形成する工程は、
前記基板上の絶縁膜及び前記平面上半導体層上に、前記柱状半導体層が埋没するように第3の絶縁膜を形成する工程と、
前記第3の絶縁膜上面を平坦化する工程と、
前記第3の絶縁膜を異方的に除去し、第3の絶縁膜を前記柱状半導体層側壁に形成されるゲート電極下端付近の高さに形成する工程と、
を含むことを特徴とする請求項63に記載の半導体装置の製造方法。 - 前記第1の絶縁膜、薄い導電膜及びポリシリコン層を異方的に除去し、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を所望の長さに形成する工程の前処理工程として、前記ポリシリコン層上面を平坦化する工程を更に含むことを特徴とする請求項63又は64に記載の半導体装置の製造方法。
- 基板上の絶縁膜上に平面状半導体層、複数の該平面状半導体層上の柱状半導体層及び該複数の柱状半導体層上のストッパー膜を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
前記基板上の絶縁膜及び前記平面上半導体層上に、前記柱状半導体層が埋没するように第3の絶縁膜を形成する工程と、
上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第3の絶縁膜を異方的に除去し、第3の絶縁膜を前記柱状半導体層側壁に形成されるゲート電極下端付近の高さに形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に薄い導電膜を形成する工程と、
前記薄い導電膜上に、前記柱状半導体層が埋没するようにポリシリコン層を形成する工程と、
その後に上面を前記ストッパー膜をストッパーとしてCMPにより平坦化する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を異方的に除去し、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を所望の長さに形成する工程と、
前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程と、
前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成する工程は、
表面に第1の保護膜を形成する工程と、
前記第1の保護膜を異方的に除去し、前記所望の長さに形成された柱状半導体層側面の前記第1の絶縁膜、薄い導電膜及びポリシリコン層の上部に所望の膜厚の第1の保護膜サイドウォールを形成する工程と、
前記第3の絶縁膜、前記第1の絶縁膜、薄い導電膜及びポリシリコン層を選択的に除去し、一体化したゲート電極及びゲート配線を形成し、前記第1の保護膜サイドウォールの保護によって、前記一体化したゲート電極及びゲート配線の少なくとも一部を前記所望の膜厚に形成する工程と、
を含むことを特徴とする請求項63ないし66のいずれか1項に記載の半導体装置の製造方法。 - 前記ゲート電極及びゲート配線を形成する工程の後に表面の少なくとも一部に第2の保護膜を形成する工程と、
前記第2の保護膜を異方的に除去し、前記柱状半導体層の各々の上部に形成される不純物領域となる領域の上面及び前記平面状半導体層上面を露出させ、前記柱状半導体層の各々の側壁及びゲート壁面を前記シリコン窒化膜で覆う工程と、
を前記柱状半導体層の各々の上部に、該柱状半導体層の各々の下部の平面状半導体層に形成された不純物領域と同じ導電型の不純物領域を形成する工程の前処理として行うことを特徴とする請求項41ないし67のいずれか1項に記載の半導体装置の製造方法。 - 前記柱状半導体層の各々の上部に形成された不純物領域の表面にシリサイド層を形成する工程を更に含むことを特徴とする請求項41ないし68のいずれか1項に記載の半導体装置の製造方法。
- 前記ゲート電極及びゲート配線を形成する工程の後に表面の少なくとも一部に第2の保護膜を形成する工程と、
前記第2の保護膜を異方的に除去し、前記柱状半導体層の各々の上部に形成される不純物領域となる領域の上面及び前記平面状半導体層上面を露出させ、前記柱状半導体層の各々の側壁及びゲート壁面を前記シリコン窒化膜で覆う工程と、
を前記柱状半導体層の各々の上部に形成された不純物領域の表面にシリサイド層を形成する工程の前処理として行うことを特徴とする請求項69に記載の半導体装置の製造方法。 - 前記異方的な除去は、エッチバックあることを特徴とする請求項41ないし70のいずれか1項に記載の半導体装置の製造方法。
- 基板上の絶縁膜上に平面状半導体層及び複数の該平面状半導体層上の柱状半導体層を形成する工程と、
前記平面状半導体層を素子に分離する工程と、
前記平面状半導体層に不純物領域を形成する工程と、
その後に表面の少なくとも一部に第1の絶縁膜を形成する工程と、
前記第1の絶縁膜上に導電膜を形成する工程と、
前記第1の絶縁膜及び前記導電膜を異方的に除去し、前記柱状半導体層側面の前記導電膜を所望の長さに形成し、ゲート電極を形成する工程と、
前記導電膜及び前記第1の絶縁膜を選択的に除去し、ゲート電極及び該ゲート電極から基板側に延びるゲート配線を形成する工程と、
前記複数の柱状半導体層の少なくとも1つの上面上部に、該柱状半導体層の上面よりも大きい不純物領域を形成する工程と、
前記複数の柱状半導体層の各々に対応する複数のMOSトランジスタのうち、第1のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部と第2のMOSトランジスタの平面状半導体層に形成された不純物領域の表面の少なくとも一部とを接続するシリサイド層を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記柱状半導体層の上面上部に形成された不純物領域の表面にシリサイド層を形成する工程を更に含むことを特徴とする請求項72に記載の半導体装置の製造方法。
- 前記柱状半導体層の上面上部に形成された不純物領域の表面に形成されたシリサイド層の大きさは、前記柱状半導体層の上面の大きさよりも大きいことを特徴とする請求項73に記載の半導体装置の製造方法。
- 前記柱状半導体層の上面上部に形成された不純物領域の上面上部に、コンタクトを形成する工程を更に含み、
前記柱状半導体上面上部に形成された不純物領域の上面の大きさは、コンタクトの底面の大きさよりも大きく、
前記コンタクトの底面の大きさが、前記不純物領域が上面上部に形成された柱状半導体層の上面の大きさよりも大きいことを特徴とする請求項72に記載の半導体装置の製造方法。 - 前記複数の柱状半導体層の少なくとも1つの上面上部に、該柱状半導体層の上面よりも大きい不純物領域を形成する工程の前処理として、
前記ゲート電極と前記柱状半導体層の上面よりも大きい不純物領域を分離するための第4絶縁膜を形成する工程を更に含むことを特徴とする請求項72に記載の半導体装置の製造方法。 - 前記ゲート電極と前記柱状半導体層の上面よりも大きい不純物領域を分離するための第4絶縁膜を形成する工程は、
表面にシリコン窒化膜を形成する工程と、
前記シリコン窒化膜を、前記ゲート電極上部のシリコン窒化膜が所定の膜厚で存在するように、且つ前記ソース拡散領域となる領域の上面及び前記ドレイン拡散領域表面を露出させるように異方的に除去し、柱状半導体層の側壁及びゲート壁面を前記シリコン窒化膜で覆う工程と、
を更に含むことを特徴とする請求項76に記載の半導体装置の製造方法。 - 前記柱状半導体層の上面上部に形成された不純物領域の表面にシリサイド層を形成する工程を更に含むことを特徴とする請求項75ないし77のいずれか1項に記載の半導体装置の製造方法。
- 同じ導電型のMOSトランジスタを構成する複数の前記柱状半導体層の上面上部に不純物領域を一体的に形成することを特徴とする請求項72から78のいずれか1項に記載の半導体装置の製造方法。
- 前記複数の柱状半導体層の少なくとも1つの上面上部に、該柱状半導体層の上面よりも大きい不純物領域を形成する工程は、エピタキシャル成長を用いることを特徴とする請求項72ないし78のいずれか1項に記載の半導体装置の製造方法。
- 前記柱状半導体層の上面よりも大きい不純物領域がn型の場合には該不純物領域としてエピタキシャルシリコン層を、前記柱状半導体層の上面よりも大きい不純物領域がp型の場合には該不純物領域としてエピタキシャルゲルマニウム層を形成することを特徴とする請求項80に記載の半導体装置の製造方法。
- 同じ導電型のMOSトランジスタを構成する複数の前記柱状半導体層の上面上部に不純物領域を一体的に形成することを特徴とする請求項80又は81に記載の半導体装置の製造方法。
- エピタキシャル成長の成膜条件を調整することにより、所定の間隔以下で隣接する、同じ導電型のMOSトランジスタを構成する複数の前記柱状半導体層に対してのみ、自己整合的に、前記複数の柱状半導体層の上面上部に不純物領域を一体的に形成することを特徴とする請求項82に記載の半導体装置の製造方法。
- 前記シリサイド層は、前記第1のMOSトランジスタの平面状半導体層に形成された不純物領域と前記第2のMOSトランジスタの平面状半導体層に形成された不純物領域を含む平面状半導体層表面の全面に形成されていることを特徴とする請求項41ないし83のいずれか1項に記載の半導体装置の製造方法。
- 前記平面状半導体層に不純物領域を形成する工程は、前記平面状半導体層に選択的に第1の導電型の不純物領域及び第2の導電型の不純物領域を形成する工程であることを特徴とする請求項41ないし83のいずれか1項に記載の半導体装置の製造方法。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009551559A JP5468390B2 (ja) | 2008-01-29 | 2009-01-29 | 半導体装置およびその製造方法 |
EP09705550.3A EP2246895A4 (en) | 2008-01-29 | 2009-01-29 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME |
KR1020127010050A KR101160104B1 (ko) | 2008-01-29 | 2009-01-29 | 반도체 장치 및 그 제조방법 |
KR1020107018631A KR101191062B1 (ko) | 2008-01-29 | 2009-01-29 | 반도체 장치 및 그 제조방법 |
CN2009801035096A CN101933149B (zh) | 2008-01-29 | 2009-01-29 | 半导体器件及其制造方法 |
US12/704,935 US8598650B2 (en) | 2008-01-29 | 2010-02-12 | Semiconductor device and production method therefor |
US12/704,955 US8188537B2 (en) | 2008-01-29 | 2010-02-12 | Semiconductor device and production method therefor |
US13/447,721 US8343835B2 (en) | 2008-01-29 | 2012-04-16 | Semiconductor device and production method therefor |
US13/541,355 US8372713B2 (en) | 2008-01-29 | 2012-07-03 | Semiconductor device and production method therefor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/051300 WO2009095997A1 (ja) | 2008-01-29 | 2008-01-29 | 半導体装置およびその製造方法 |
JPPCT/JP2008/051300 | 2008-01-29 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/704,935 Continuation US8598650B2 (en) | 2008-01-29 | 2010-02-12 | Semiconductor device and production method therefor |
US12/704,955 Continuation US8188537B2 (en) | 2008-01-29 | 2010-02-12 | Semiconductor device and production method therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009096464A1 true WO2009096464A1 (ja) | 2009-08-06 |
Family
ID=40912366
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/051300 WO2009095997A1 (ja) | 2008-01-29 | 2008-01-29 | 半導体装置およびその製造方法 |
PCT/JP2009/051459 WO2009096464A1 (ja) | 2008-01-29 | 2009-01-29 | 半導体装置およびその製造方法 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/051300 WO2009095997A1 (ja) | 2008-01-29 | 2008-01-29 | 半導体装置およびその製造方法 |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP2383778A3 (ja) |
KR (2) | KR101160104B1 (ja) |
CN (1) | CN101933149B (ja) |
TW (1) | TWI493683B (ja) |
WO (2) | WO2009095997A1 (ja) |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2287895A1 (en) * | 2009-08-18 | 2011-02-23 | Unisantis Electronics (Japan) Ltd. | Semiconductor device and production method thereof |
JP2011061181A (ja) * | 2009-08-11 | 2011-03-24 | Unisantis Electronics Japan Ltd | 半導体装置及びその製造方法 |
JP2011077437A (ja) * | 2009-10-01 | 2011-04-14 | Unisantis Electronics Japan Ltd | 半導体装置 |
JP2011086900A (ja) * | 2009-09-16 | 2011-04-28 | Unisantis Electronics Japan Ltd | 半導体装置 |
JP2011165830A (ja) * | 2010-02-08 | 2011-08-25 | Elpida Memory Inc | 半導体装置及びその製造方法 |
JP2011258780A (ja) * | 2010-06-09 | 2011-12-22 | Unisantis Electronics Japan Ltd | 半導体装置とその製造方法 |
JP2012004244A (ja) * | 2010-06-15 | 2012-01-05 | Unisantis Electronics Singapore Pte Ltd | 半導体装置及びその製造方法 |
US20120168819A1 (en) * | 2011-01-03 | 2012-07-05 | Fabio Alessio Marino | Semiconductor pillar power MOS |
US8319293B2 (en) | 2009-03-25 | 2012-11-27 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8343835B2 (en) | 2008-01-29 | 2013-01-01 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8372713B2 (en) | 2008-01-29 | 2013-02-12 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8482041B2 (en) | 2007-10-29 | 2013-07-09 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor structure and method of fabricating the semiconductor structure |
US8487357B2 (en) | 2010-03-12 | 2013-07-16 | Unisantis Electronics Singapore Pte Ltd. | Solid state imaging device having high sensitivity and high pixel density |
US8497548B2 (en) | 2009-04-28 | 2013-07-30 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device including a MOS transistor and production method therefor |
US8564034B2 (en) | 2011-09-08 | 2013-10-22 | Unisantis Electronics Singapore Pte. Ltd. | Solid-state imaging device |
US8575662B2 (en) | 2010-03-08 | 2013-11-05 | Unisantis Electronics Singapore Pte Ltd. | Solid state imaging device having high pixel density |
US8669601B2 (en) | 2011-09-15 | 2014-03-11 | Unisantis Electronics Singapore Pte. Ltd. | Method for producing semiconductor device and semiconductor device having pillar-shaped semiconductor |
US8748938B2 (en) | 2012-02-20 | 2014-06-10 | Unisantis Electronics Singapore Pte. Ltd. | Solid-state imaging device |
US8772175B2 (en) | 2011-12-19 | 2014-07-08 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
US8772881B2 (en) | 2009-06-05 | 2014-07-08 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device |
US8916478B2 (en) | 2011-12-19 | 2014-12-23 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
WO2015015566A1 (ja) * | 2013-07-30 | 2015-02-05 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
WO2015015565A1 (ja) * | 2013-07-30 | 2015-02-05 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
WO2015019470A1 (ja) * | 2013-08-08 | 2015-02-12 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
WO2015019469A1 (ja) * | 2013-08-08 | 2015-02-12 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
WO2015104947A1 (ja) * | 2014-01-08 | 2015-07-16 | ソニー株式会社 | 半導体装置、メモリ回路、および半導体装置の製造方法 |
JP5770406B1 (ja) * | 2014-04-10 | 2015-08-26 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
JP2018014514A (ja) * | 2017-09-06 | 2018-01-25 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
US10002934B2 (en) | 2012-05-21 | 2018-06-19 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013080378A1 (ja) * | 2011-12-02 | 2013-06-06 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置の製造方法と半導体装置 |
US9373675B2 (en) | 2012-02-06 | 2016-06-21 | Taiwan Semiconductor Manufacturing Company, Ltd. | Capacitor structure and method of forming the same |
KR20130104200A (ko) * | 2012-03-13 | 2013-09-25 | 에스케이하이닉스 주식회사 | 반도체 장치 및 그 제조 방법 |
US9865716B2 (en) * | 2012-08-24 | 2018-01-09 | Taiwan Semiconductor Manufacturing Company, Ltd. | System and method for a vertical tunneling field-effect transistor cell |
JP2014220465A (ja) * | 2013-05-10 | 2014-11-20 | ピーエスフォー ルクスコ エスエイアールエルPS4 Luxco S.a.r.l. | 半導体装置 |
JP5639317B1 (ja) | 2013-11-06 | 2014-12-10 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | Sgtを有する半導体装置と、その製造方法 |
US9966448B2 (en) * | 2014-05-16 | 2018-05-08 | Taiwan Semiconductor Manufacturing Company Limited | Method of making a silicide beneath a vertical structure |
US9373620B2 (en) * | 2014-09-12 | 2016-06-21 | Taiwan Semiconductor Manufacturing Co., Ltd. | Series connected transistor structure and method of manufacturing the same |
KR102379267B1 (ko) * | 2015-04-01 | 2022-03-28 | 삼성전자주식회사 | 아이솔레이션 영역 상의 스페이서를 갖는 반도체 소자 |
JP6884569B2 (ja) * | 2015-12-25 | 2021-06-09 | 株式会社半導体エネルギー研究所 | 半導体装置及びその作製方法 |
US9881872B2 (en) | 2016-01-15 | 2018-01-30 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method for fabricating a local interconnect in a semiconductor device |
JPWO2021176693A1 (ja) * | 2020-03-06 | 2021-09-10 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02188966A (ja) | 1989-01-17 | 1990-07-25 | Toshiba Corp | Mos型半導体装置 |
JPH0799311A (ja) | 1993-05-12 | 1995-04-11 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JP2003179160A (ja) * | 2001-10-18 | 2003-06-27 | Chartered Semiconductor Mfg Ltd | 縦形デバイスの集積化を用いて自己整合性cmosインバータを形成する方法 |
JP2006294995A (ja) * | 2005-04-13 | 2006-10-26 | Nec Corp | 電界効果トランジスタ及びその製造方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2804539B2 (ja) | 1989-09-28 | 1998-09-30 | 沖電気工業株式会社 | 半導体装置およびその製造方法 |
US5244824A (en) * | 1990-09-05 | 1993-09-14 | Motorola, Inc. | Trench capacitor and transistor structure and method for making the same |
US5208172A (en) * | 1992-03-02 | 1993-05-04 | Motorola, Inc. | Method for forming a raised vertical transistor |
JPH06334146A (ja) * | 1993-05-26 | 1994-12-02 | Toshiba Corp | 半導体装置 |
JP3745392B2 (ja) * | 1994-05-26 | 2006-02-15 | 株式会社ルネサステクノロジ | 半導体装置 |
JPH098290A (ja) * | 1995-06-20 | 1997-01-10 | Mitsubishi Electric Corp | 半導体装置及びその製造方法 |
US7372091B2 (en) * | 2004-01-27 | 2008-05-13 | Micron Technology, Inc. | Selective epitaxy vertical integrated circuit components |
KR100861236B1 (ko) | 2007-04-10 | 2008-10-02 | 경북대학교 산학협력단 | 낮은 누설전류를 갖는 기둥형 전계효과트랜지스터 |
-
2008
- 2008-01-29 WO PCT/JP2008/051300 patent/WO2009095997A1/ja active Application Filing
-
2009
- 2009-01-23 TW TW098102809A patent/TWI493683B/zh active
- 2009-01-29 KR KR1020127010050A patent/KR101160104B1/ko active IP Right Grant
- 2009-01-29 CN CN2009801035096A patent/CN101933149B/zh active Active
- 2009-01-29 WO PCT/JP2009/051459 patent/WO2009096464A1/ja active Application Filing
- 2009-01-29 EP EP11006235.3A patent/EP2383778A3/en not_active Withdrawn
- 2009-01-29 EP EP09705550.3A patent/EP2246895A4/en not_active Withdrawn
- 2009-01-29 KR KR1020107018631A patent/KR101191062B1/ko active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02188966A (ja) | 1989-01-17 | 1990-07-25 | Toshiba Corp | Mos型半導体装置 |
JPH0799311A (ja) | 1993-05-12 | 1995-04-11 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
JP2003179160A (ja) * | 2001-10-18 | 2003-06-27 | Chartered Semiconductor Mfg Ltd | 縦形デバイスの集積化を用いて自己整合性cmosインバータを形成する方法 |
JP2006294995A (ja) * | 2005-04-13 | 2006-10-26 | Nec Corp | 電界効果トランジスタ及びその製造方法 |
Non-Patent Citations (3)
Title |
---|
S. MAEDA ET AL.: "Impact of a Vertical <&-Shape Transistor Cell for 1 Gbit DRAM and Beyond", IEEE TRANSACTIONS ON ELECTRON DEVICES, vol. 42, no. 12, December 1995 (1995-12-01), pages 2117 - 2124 |
See also references of EP2246895A4 * |
Y. -K CHOI ET AL.: "FinFET Process Refinements for Improved Mobility and Gate Work Function Engineering", INTERNATIONAL ELECTRON DEVICES MEETING TECHNICAL DIGEST, 2002, pages 259 |
Cited By (62)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8482041B2 (en) | 2007-10-29 | 2013-07-09 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor structure and method of fabricating the semiconductor structure |
US8598650B2 (en) | 2008-01-29 | 2013-12-03 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8372713B2 (en) | 2008-01-29 | 2013-02-12 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8343835B2 (en) | 2008-01-29 | 2013-01-01 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8319293B2 (en) | 2009-03-25 | 2012-11-27 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8642426B2 (en) | 2009-03-25 | 2014-02-04 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method therefor |
US8497548B2 (en) | 2009-04-28 | 2013-07-30 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device including a MOS transistor and production method therefor |
US8647947B2 (en) | 2009-04-28 | 2014-02-11 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device including a MOS transistor and production method therefor |
US8772881B2 (en) | 2009-06-05 | 2014-07-08 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device |
US8558317B2 (en) | 2009-08-11 | 2013-10-15 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method |
US9484268B2 (en) | 2009-08-11 | 2016-11-01 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method |
US9059309B2 (en) | 2009-08-11 | 2015-06-16 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method |
JP2011061181A (ja) * | 2009-08-11 | 2011-03-24 | Unisantis Electronics Japan Ltd | 半導体装置及びその製造方法 |
CN101996942A (zh) * | 2009-08-18 | 2011-03-30 | 日本优尼山帝斯电子株式会社 | 半导体器件及其制造方法 |
US8466512B2 (en) | 2009-08-18 | 2013-06-18 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method thereof |
US8563379B2 (en) | 2009-08-18 | 2013-10-22 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device and production method thereof |
TWI415196B (zh) * | 2009-08-18 | 2013-11-11 | Unisantis Elect Singapore Pte | 半導體裝置及其製造方法 |
EP2287895A1 (en) * | 2009-08-18 | 2011-02-23 | Unisantis Electronics (Japan) Ltd. | Semiconductor device and production method thereof |
JP2011086900A (ja) * | 2009-09-16 | 2011-04-28 | Unisantis Electronics Japan Ltd | 半導体装置 |
US8441066B2 (en) | 2009-09-16 | 2013-05-14 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device |
JP2011077437A (ja) * | 2009-10-01 | 2011-04-14 | Unisantis Electronics Japan Ltd | 半導体装置 |
US8610202B2 (en) | 2009-10-01 | 2013-12-17 | Unisantis Electronics Singapore Pte Ltd. | Semiconductor device having a surrounding gate |
JP2011165830A (ja) * | 2010-02-08 | 2011-08-25 | Elpida Memory Inc | 半導体装置及びその製造方法 |
US8575662B2 (en) | 2010-03-08 | 2013-11-05 | Unisantis Electronics Singapore Pte Ltd. | Solid state imaging device having high pixel density |
US8487357B2 (en) | 2010-03-12 | 2013-07-16 | Unisantis Electronics Singapore Pte Ltd. | Solid state imaging device having high sensitivity and high pixel density |
US8609494B2 (en) | 2010-06-09 | 2013-12-17 | Unisantis Electronics Singapore Pte Ltd. | Surround gate CMOS semiconductor device |
US8486785B2 (en) | 2010-06-09 | 2013-07-16 | Unisantis Electronics Singapore Pte Ltd. | Surround gate CMOS semiconductor device |
JP2011258780A (ja) * | 2010-06-09 | 2011-12-22 | Unisantis Electronics Japan Ltd | 半導体装置とその製造方法 |
JP2012004244A (ja) * | 2010-06-15 | 2012-01-05 | Unisantis Electronics Singapore Pte Ltd | 半導体装置及びその製造方法 |
US9153697B2 (en) | 2010-06-15 | 2015-10-06 | Unisantis Electronics Singapore Pte Ltd. | Surrounding gate transistor (SGT) structure |
US20120168819A1 (en) * | 2011-01-03 | 2012-07-05 | Fabio Alessio Marino | Semiconductor pillar power MOS |
US8564034B2 (en) | 2011-09-08 | 2013-10-22 | Unisantis Electronics Singapore Pte. Ltd. | Solid-state imaging device |
US8669601B2 (en) | 2011-09-15 | 2014-03-11 | Unisantis Electronics Singapore Pte. Ltd. | Method for producing semiconductor device and semiconductor device having pillar-shaped semiconductor |
US8772175B2 (en) | 2011-12-19 | 2014-07-08 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
US9362353B2 (en) | 2011-12-19 | 2016-06-07 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device |
US9806163B2 (en) | 2011-12-19 | 2017-10-31 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device having an nMOS SGT and a pMOS SGT |
US9748244B2 (en) | 2011-12-19 | 2017-08-29 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
US9478545B2 (en) | 2011-12-19 | 2016-10-25 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
US9245889B2 (en) | 2011-12-19 | 2016-01-26 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
US8916478B2 (en) | 2011-12-19 | 2014-12-23 | Unisantis Electronics Singapore Pte. Ltd. | Method for manufacturing semiconductor device and semiconductor device |
US9035384B2 (en) | 2011-12-19 | 2015-05-19 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device |
US8748938B2 (en) | 2012-02-20 | 2014-06-10 | Unisantis Electronics Singapore Pte. Ltd. | Solid-state imaging device |
US10002934B2 (en) | 2012-05-21 | 2018-06-19 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device |
US9484424B2 (en) | 2013-07-30 | 2016-11-01 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device with a NAND circuit having four transistors |
WO2015015566A1 (ja) * | 2013-07-30 | 2015-02-05 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
US9627496B2 (en) | 2013-07-30 | 2017-04-18 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor with a two-input NOR circuit |
JP5686932B1 (ja) * | 2013-07-30 | 2015-03-18 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
JP5686931B1 (ja) * | 2013-07-30 | 2015-03-18 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
WO2015015565A1 (ja) * | 2013-07-30 | 2015-02-05 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
US9449988B2 (en) | 2013-08-08 | 2016-09-20 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device with six transistors forming a nor circuit |
JP5677642B1 (ja) * | 2013-08-08 | 2015-02-25 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
WO2015019470A1 (ja) * | 2013-08-08 | 2015-02-12 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
JP5677643B1 (ja) * | 2013-08-08 | 2015-02-25 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
US9601510B2 (en) | 2013-08-08 | 2017-03-21 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device with six transistors forming a NAND circuit |
WO2015019469A1 (ja) * | 2013-08-08 | 2015-02-12 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
JPWO2015104947A1 (ja) * | 2014-01-08 | 2017-03-23 | ソニー株式会社 | 半導体装置、メモリ回路、および半導体装置の製造方法 |
US10269867B2 (en) | 2014-01-08 | 2019-04-23 | Sony Corporation | Semiconductor device, memory circuit, method of manufacturing semiconductor device |
WO2015104947A1 (ja) * | 2014-01-08 | 2015-07-16 | ソニー株式会社 | 半導体装置、メモリ回路、および半導体装置の製造方法 |
WO2015155863A1 (ja) * | 2014-04-10 | 2015-10-15 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッド | 半導体装置 |
US9641179B2 (en) | 2014-04-10 | 2017-05-02 | Unisantis Electronics Singapore Pte. Ltd. | Semiconductor device |
JP5770406B1 (ja) * | 2014-04-10 | 2015-08-26 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
JP2018014514A (ja) * | 2017-09-06 | 2018-01-25 | ユニサンティス エレクトロニクス シンガポール プライベート リミテッドUnisantis Electronics Singapore Pte Ltd. | 半導体装置 |
Also Published As
Publication number | Publication date |
---|---|
CN101933149B (zh) | 2012-09-19 |
EP2246895A4 (en) | 2013-08-14 |
KR20100117618A (ko) | 2010-11-03 |
TW200937618A (en) | 2009-09-01 |
EP2383778A2 (en) | 2011-11-02 |
KR20120046797A (ko) | 2012-05-10 |
KR101160104B1 (ko) | 2012-06-26 |
TWI493683B (zh) | 2015-07-21 |
KR101191062B1 (ko) | 2012-10-15 |
CN101933149A (zh) | 2010-12-29 |
EP2246895A1 (en) | 2010-11-03 |
EP2383778A3 (en) | 2013-08-14 |
WO2009095997A1 (ja) | 2009-08-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4316658B2 (ja) | 半導体装置の製造方法 | |
JP4316657B2 (ja) | 半導体装置 | |
WO2009096464A1 (ja) | 半導体装置およびその製造方法 | |
JP4316659B2 (ja) | 半導体装置およびその製造方法 | |
US20230282647A1 (en) | Method of manufacturing semiconductor device | |
US10090300B2 (en) | Fin-like field effect transistor (FinFET) device and method of manufacturing same | |
KR100532353B1 (ko) | 핀 전계 효과 트랜지스터 및 그 제조방법 | |
KR100523310B1 (ko) | 반도체 장치 | |
US9443870B2 (en) | Semiconductor device and method of manufacturing the same | |
JP6363895B2 (ja) | 半導体装置の製造方法 | |
JP4372832B2 (ja) | 半導体装置およびその製造方法 | |
JP2007317796A (ja) | 半導体装置および半導体装置の製造方法 | |
JP5559385B2 (ja) | 半導体装置およびその製造方法 | |
JP5468390B2 (ja) | 半導体装置およびその製造方法 | |
JP6543392B2 (ja) | 半導体装置 | |
US20240097038A1 (en) | Semiconductor device and method of fabricating the same | |
CN116261321A (zh) | 半导体结构及其形成方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980103509.6 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09705550 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2009551559 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 5431/DELNP/2010 Country of ref document: IN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20107018631 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2009705550 Country of ref document: EP |