WO2013000196A1 - 一种半导体结构及其制造方法 - Google Patents
一种半导体结构及其制造方法 Download PDFInfo
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- WO2013000196A1 WO2013000196A1 PCT/CN2011/078877 CN2011078877W WO2013000196A1 WO 2013000196 A1 WO2013000196 A1 WO 2013000196A1 CN 2011078877 W CN2011078877 W CN 2011078877W WO 2013000196 A1 WO2013000196 A1 WO 2013000196A1
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- metal layer
- soi
- gate structure
- soi substrate
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 90
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- 239000010703 silicon Substances 0.000 abstract description 19
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 18
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- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41733—Source or drain electrodes for field effect devices for thin film transistors with insulated gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/66545—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using a dummy, i.e. replacement gate in a process wherein at least a part of the final gate is self aligned to the dummy gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66643—Lateral single gate silicon transistors with source or drain regions formed by a Schottky barrier or a conductor-insulator-semiconductor structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/66742—Thin film unipolar transistors
- H01L29/66772—Monocristalline silicon transistors on insulating substrates, e.g. quartz substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/7839—Field effect transistors with field effect produced by an insulated gate with Schottky drain or source contact
Definitions
- the present invention relates to the field of semiconductor fabrication, and more particularly to a semiconductor structure and a method of fabricating the same. Background technique
- Silicon-on-insulator has good dielectric isolation characteristics, and integrated circuits made of SOI have small parasitic capacitance, high integration density, high speed, simple process and small short channel effect.
- the advantage is that the SOI substrate usually comprises three main structures, namely a bulk silicon layer, a buried buried layer (Body layer) on the bulk silicon layer, and an SOI layer covering the BOX layer.
- the material of the SOI layer is typically monocrystalline silicon.
- the SOI substrate when the above-described SOI substrate is used to produce a semiconductor device, when a contact plug with a source/drain region is formed, the contact area between the bottom of the contact plug and the source/drain region is limited due to the reduction in device size. The contact resistance is large. In order to improve the performance of the semiconductor device, it is desirable to reduce the above contact resistance.
- the SOI substrate may be etched first, for example, the SOI layer 11 and the BOX layer 12 on both sides of the gate structure 16 are etched to form a trench exposing the BOX layer 12, and then formed in the trench.
- the metal layer 15, the metal layer 15 is in contact with the SOI layer under the gate structure 16.
- the semiconductor structure shown in Fig. 1 has a lower contact resistance. But that The semiconductor structure still has certain disadvantages. When the semiconductor device formed by the semiconductor structure is processed, a large capacitance exists between the metal layer 15 and the bulk silicon layer 13, which lowers the performance of the semiconductor device. Summary of the invention
- the present invention provides a method of fabricating a semiconductor structure, the method comprising: a) providing an SOI substrate, and forming a gate structure on the SOI substrate;
- the present invention also provides a method of fabricating another semiconductor structure, the method comprising:
- the present invention also provides a semiconductor structure including an SOI substrate, a gate structure, a sidewall, and a metal layer, wherein:
- the SOI substrate includes an SOI layer and a BOX layer
- the gate structure is formed on the SOI layer
- the metal layer is formed in the SOI substrate on both sides of the gate structure, the metal layer and The SOI layer under the gate structure contacts and extends into the BOX layer;
- a sidewall is present between the metal layer and the BOX layer.
- the semiconductor structure and the method of fabricating the same provided by the present invention first form a trench extending to the BOX layer on the SOI substrate, then form a sidewall on the sidewall of the trench, and finally form a metal layer in the trench due to
- the sidewall spacer has a certain thickness, so that the distance between the metal layer and the bulk silicon layer of the SOI substrate becomes larger, and the area of the lower surface of the metal layer facing the bulk silicon layer is reduced, and the distance is increased and the area is reduced.
- the small capacitance of the semiconductor device during operation reduces the capacitance between the metal layer and the bulk silicon layer of the SOI substrate, which is advantageous for improving the performance of the semiconductor device.
- FIG. 1 is a cross-sectional structural view of a semiconductor structure formed by the prior art
- FIG. 2 is a flow diagram of one embodiment of a method of fabricating a semiconductor structure in accordance with the present invention
- FIG. 3 to FIG. 10 are cross-sectional structural views showing respective stages of fabrication of the semiconductor structure in the process of fabricating a semiconductor structure in accordance with the flow shown in FIG. 2(a) according to an embodiment of the present invention
- FIG. Figure 15 is a cross-sectional structural view showing various stages of fabrication of the semiconductor structure in the process of fabricating a semiconductor structure in accordance with the flow shown in Figure 2(b) in accordance with another embodiment of the present invention.
- first and second features are formed in direct contact
- additional features formed in the first and second features. In other embodiments, such first and second features may not be in direct contact.
- FIG. 8 is a cross-sectional structural view of a specific embodiment of a semiconductor structure according to the present invention, the semiconductor structure including A gate structure 200, a sidewall 160, and a metal layer 150, wherein:
- the SOI substrate includes an SOI layer 100 and a BOX layer 110;
- the gate structure 200 is formed over the SOI layer 100;
- the metal layer 150 is formed in the SOI substrate on both sides of the gate structure 200, and the metal layer 150 is in contact with the SOI layer 100 under the gate structure 200 and extends to Inside the BOX layer 110;
- a sidewall 160 is present between the metal layer 150 and the BOX layer 110.
- sidewall spacers 210 are also formed on both sides of the gate structure 200.
- a sidewall 160 is also present between the metal layer 150 and the isolation region 120 of the SOI substrate.
- the SOI substrate has at least three layers of structures: a bulk silicon layer 130, a BOX layer 110 over the bulk silicon layer 130, and an SOI layer 100 overlying the BOX layer 110.
- the material of the BOX layer 110 is generally selected from SiO 2 , and the thickness of the BOX layer is usually greater than 100 nm; the material of the SOI layer 100 is a single crystal silicon, Ge or III-V compound, and the SOI substrate selected in the embodiment. It is an SOI substrate having an Ultrathin SOI layer 100, and thus the thickness of the SOI layer 100 is usually less than 100 nm, for example, 50 nm.
- an isolation region 120 is formed in the SOI substrate for dividing the SOI layer 100 into independent regions for subsequent processing to form a transistor structure.
- the material of the isolation region 120 is an insulating material, for example, Si0 2 may be selected. , Si 3 N 4 or a combination thereof, of the isolation region 120
- the width can be determined by the design requirements of the semiconductor structure.
- the gate structure 200 includes a gate dielectric layer and a gate stack.
- the spacer 210 may be formed of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide, and/or other suitable materials.
- the side wall 210 may have a multi-layer structure.
- the spacer 210 may be formed by a deposition-etch process having a thickness ranging from about 10 nm to 100 nm.
- the material of the metal layer 150 may be selected from W, Al, TiAl, TiN or a combination thereof.
- the planarization process is performed such that the upper plane of the metal layer 150 is flush with the lower plane of the gate structure 200.
- the metal layer 150 is in contact not only with the SOI layer 100 and the BOX layer 110, but also with the isolation region 120.
- the thickness of the metal layer 150 ranges from 50 nm to 150 nm.
- the metal layer 150 is not planarized, and adjacent semiconductor devices are electrically connected to each other through the metal layer 150 to form a local interconnect of the semiconductor device.
- the material of the sidewall 160 is a low-k material such as SiO 2 , SiOF, SiCOH, SiO, SiCO, SiCON, or a combination thereof.
- the semiconductor structure further includes a dielectric layer 300 covering the gate structure 200 and the metal layer 150.
- the dielectric layer 300 includes: a contact with the metal layer 150.
- the material of the dielectric layer 300 may include SiO 2 , carbon doped SiO 2 , BPSG, PSG, UGS, silicon oxynitride, low k material or a combination thereof, and the thickness may range from 40 nm to 150 nm, such as 80 nm, 100 nm or 120 nm;
- a contact plug 330 and a second contact plug 340 are embedded in the dielectric layer 300, and the material thereof may be any one of W, Al, TiAl alloy or a combination thereof. It should be noted that in the gate-last process, if the gate structure 200 is a dummy gate, the dummy gate has been replaced with a gate stack structure before the dielectric layer 300 is formed.
- the above embodiment or other suitable semiconductor structure may be included depending on manufacturing requirements. Further elaboration.
- FIG. 2(a) is a flow chart of a specific embodiment of a method of fabricating a semiconductor structure according to the present invention, the method comprising:
- Step S101 providing an SOI substrate, and forming a gate structure on the SOI substrate;
- Step S102 etching an SOI layer and a BOX layer of the SOI substrate on both sides of the gate structure to form a trench exposing the BOX layer, the trench portion entering the BOX layer;
- Step S103 forming a sidewall on a sidewall of the trench
- Step S104 forming a metal layer covering the sidewall in the trench, the metal layer being in contact with the SOI layer under the gate structure.
- FIG. 3 to FIG. 8 are diagrams showing the manufacture of the semiconductor structure in the process of fabricating a semiconductor structure in accordance with the flow shown in FIG. 1 according to an embodiment of the present invention. Schematic diagram of the cross-sectional structure of the stage. It is to be understood that the drawings of the various embodiments of the invention are in
- step S101 is performed to provide an SOI substrate, and a gate structure 200 is formed on the SOI substrate.
- the SOI substrate has at least three layers of structures: a bulk silicon layer 130, a BOX layer 110 over the bulk silicon layer 130, and an SOI overlying the BOX layer 110.
- Layer 100 The material of the BOX layer 110 is generally selected from SiO 2 , and the thickness of the BOX layer is generally greater than 100 nm; the material of the SOI layer 100 is a single crystal silicon, Ge or ⁇ -V compound, and the SOI substrate selected in the embodiment. It is an SOI substrate having an Ultrathin SOI layer 100, and thus the thickness of the SOI layer 100 is usually less than 100 nm, for example, 50 nm.
- an isolation region 120 is formed in the SOI substrate for dividing the SOI layer 100 into independent regions for subsequent processing to form a transistor structure.
- the material of the isolation region 120 is an insulating material, for example, Si0 2 may be selected.
- the Si 3 N 4 or a combination thereof, the width of the isolation region 120 may be determined depending on the design requirements of the semiconductor structure.
- a gate structure 200 is formed on the SOI substrate.
- the gate structure 200 is formed as follows: a gate covering the SOI layer 100 and the isolation region 120 is formed. a dielectric layer, a gate metal layer covering the gate dielectric layer, a gate electrode layer covering the gate metal layer, an oxide layer covering the gate electrode layer, a nitride layer covering the oxide layer, and a nitride layer covering and patterned for engraving Etching the photoresist layer of the gate stack, wherein the material of the gate dielectric layer may be a thermal oxide layer, including silicon oxide, silicon oxynitride, or a high-k dielectric such as Hf0 2 , HfSiO, HfSiON, HfTaO, HfTiO, HfZrO, A1 2 0 3 , La 2 O 3 , Zr0 2 , LaAlO or a combination thereof, the thickness of which is between 1 nm and 4
- the SOI layer 100 may be sequentially formed by chemical vapor deposition, high density plasma CVD, ALD, plasma enhanced atomic layer deposition, pulsed laser deposition, or other suitable method. on. After the photoresist layer is patterned, the above multilayer structure can be etched to form the gate structure 200 as shown in FIG.
- the gate structure 200 includes a dummy gate and a gate dielectric layer carrying a dummy gate, and a replacement gate process can be performed in a subsequent step to remove the dummy gate to form a desired gate stack structure.
- sidewall spacers 210 are formed on both sides of the gate structure 200 for separating the gate structures 200.
- the spacer 210 may be formed of silicon nitride, silicon oxide, silicon oxynitride, silicon carbide, and/or other suitable materials.
- the side wall 210 may have a multi-layered structure.
- the spacer 210 may be formed by a deposition-etching process having a thickness ranging from about 10 nm to 100 nm.
- step S102 is performed to etch the SOI layer 100 and the BOX layer 110 of the SOI substrate on both sides of the gate structure 200 to form a trench 140 exposing the BOX layer 110, the trench 140. At least partially enters the BOX layer 110.
- the SOI layer 100 on both sides of the gate structure 200 is first removed using a suitable etching process, and then the exposed portion of the BOX layer 110 is removed to form the trench 140, so that the trench 140 not only exposes the BOX layer
- the remaining portion of 110 partially replaces the unetched BOX layer 110 spatially, and the trench 140 partially enters the BOX layer 110.
- the depth of the trench 140 is the sum of the thickness of the etched SOI layer 100 and the thickness of the etched BOX layer 110.
- the thickness of the BOX layer 110 is generally greater than 100 nm.
- the thickness of the Ultrathin SOI layer 100 is 20 nm to 30 nm, so the depth of the trench 140 ranges from 50 nm to 150 ⁇ .
- step S103 is performed to form a sidewall 160 on the sidewall of the trench 140.
- the sidewalls 160 may be formed on the sidewalls of the trenches 140 using a suitable deposition method or a selective growth method.
- the width of the trench 140 is large and a portion of the isolation region 120 is exposed.
- the sidewall spacers 160 are formed on the sidewalls of the exposed BOX layer 110 and the sidewalls of the exposed isolation regions 120 in this embodiment.
- the following steps may be referred to: first, the entire gate stack and a portion adjacent to the sidewall of the gate stack are covered with a photoresist or other mask, After etching, the sidewall 160 adjacent to the STI 120 is formed to remove the photoresist or other mask; then the STI is then etched to form the sidewall 160 adjacent to the sidewall of the BOX 110, as will be known to those skilled in the art, this step is etched at least It can be divided into three steps.
- the sidewall 210 is used as the stop layer for etching, then the SOI layer 100 is used as the stop layer for the second etching, and finally the sidewall of the BOX 110 is used as the stop layer for the third time.
- the etch is formed until the shape of the side wall 160 as shown in FIG.
- Those skilled in the art can also etch by other processes known to form the shape of the spacer 160 as shown in FIG.
- trenches 140 are formed to have a limited width and do not expose isolation regions 120, such that sidewalls 160 are formed only on the sidewalls of the exposed BOX layer.
- the material of the sidewall 160 is a low-k material such as SiO 2 , SiOF, SiCOH, SiO, SiCO, SiCON, or a combination thereof.
- Those skilled in the art can also etch the shape of the spacer 160 as shown in FIG. 7 by the above-mentioned processes or other processes known to them.
- step S104 is performed to form a metal layer 150 covering the sidewall spacer 160 in the trench 140, the metal layer 150 being in contact with the SOI layer 100 under the gate structure 200.
- the material of the metal layer 150 may be selected from W, Al, TiAl, TiN or a combination thereof.
- the metal layer 150 may be formed in the trench 140 by a suitable deposition process, such as by a CVD process.
- the metal layer 150 may be subjected to a planarization process by chemical mechanical polishing such that the upper plane of the metal layer 150 is flush with the lower plane of the gate structure 200.
- step S102 the range of the SOI substrate is enlarged and etched, so that the formed trench 140 has a large area, which is convenient for reducing the alignment of the etch contact hole in subsequent processing, for example, completely etching the gate structure 200 and isolating.
- the SOI layer 100 and the portion of the BOX layer 110 between the regions 120 cause the trenches 140 to expose a portion of the isolation regions 120, so that the area of the metal layer 150 formed in step S104 correspondingly is also larger.
- the CMP step described above is not required, and the metal layer 150 may be suitably etched such that adjacent semiconductor devices are electrically connected to each other through the metal layer 150.
- the method provided in this embodiment may further include step S105, where Specifically, the method includes: forming a dielectric layer 300 covering the gate structure 200 and the metal layer 150, and forming a first contact hole 310 exposing at least a portion of the metal layer 150 in the dielectric layer 300, and exposing at least a portion of the gate
- Dielectric layer 300 can be formed by CVD, high density plasma CVD, spin coating, or other suitable method.
- the material of the dielectric layer 300 may include SiO 2 , carbon doped SiO 2 , BPSG, PSG, UGS, silicon oxynitride, a low k material, or a combination thereof.
- the thickness of the dielectric layer 300 may generally range from 40 nm to 150 nm, such as 80 nm, 100 nm or 120 nm.
- the first contact 310 penetrating the dielectric layer 300 stops at the metal layer 150. At least a portion of the metal layer 150 is exposed and exposed, and the second contact hole 320 of the dielectric layer 300 extending through the gate structure 200 exposes at least a portion of the gate structure 200.
- gate structure 200 Prior to formation of dielectric layer 300, gate structure 200 is typically processed to form exposed metal gate 200.
- the upper surface of the metal layer 150 may be engraved.
- the first contact hole 310 is etched to block the stop layer, and the upper surface of the metal gate 200 is used as the stop layer for etching the second contact hole 320. Therefore, the first contact hole 310 and the second contact hole 320 are respectively etched.
- the stop layer so that the control requirements of the etching process are reduced, that is, the difficulty of etching is reduced.
- the first contact hole 310 and the second contact hole 320 are usually filled with metal.
- the first contact plug 330 and the second contact plug 340 are formed.
- the metal is W, of course, according to For the manufacture of the semiconductor, the material of the metal may also be any one of W, Al, TiAl alloy or a combination thereof.
- FIG. 2(b) is a flow chart showing another embodiment of a method of fabricating a semiconductor structure according to the present invention, the method comprising:
- Step S201 providing an SOI substrate, covering a mask on the SOI substrate, wherein a region covered by the mask is a region where a gate line is predetermined to be formed;
- Step S202 etching the SOI layer and the BOX layer of the SOI substrate on both sides of the mask to form a trench exposing the BOX layer, the trench portion entering the BOX layer;
- step S203 forming a sidewall on a sidewall of the trench
- Step S204 forming a metal layer covering the sidewall in the trench, the metal layer being in contact with the SOI layer under the gate structure.
- Step S205 removing the mask to expose a masked region thereof, forming a gate on the region Structure.
- Steps S201 to S205 are described below with reference to FIGS. 11 to 15, which are semiconductors in the process of fabricating a semiconductor structure according to the flow shown in FIG. 2(b) according to an embodiment of the present invention. Schematic diagram of the cross-sectional structure of each stage of the structure.
- the drawings of the various embodiments of the present invention are intended to be illustrative only and are not necessarily to scale.
- the method illustrated in FIG. 2(b) differs from the method illustrated in FIG. 2(a) in that: the flow in FIG. 2(a), first forming a gate structure on a substrate, and then engraving The etching forms a trench, further forming a sidewall on the sidewall of the trench, and then forming a metal layer covering the sidewall in the trench; and the method flow shown in FIG. 2(b) is first on the substrate Forming a mask thereon, masking the area where the gate structure needs to be formed, and then etching to form a trench, as in the step of FIG.
- the mask 400 is overlaid on the SOI substrate, and a photoresist is usually used as a mask. Then, the photoresist mask is patterned by a photolithography process, and then a patterned photoresist mask is used to form a desired shape by an etching process, which is the shape of the gate line in the present invention. Etching is then performed to form trenches 140 having a depth in the range of 50 nm to 150 nm. The trench 140 exposes a portion of the isolation region 120 of the SOI substrate.
- a sidewall 160 is formed in the trench 140.
- the material of the side wall 160 is a low k material.
- sidewall spacers 160 may be formed on the sidewalls of the exposed BOX layer 110, as well as on the sidewalls of the exposed isolation regions 120.
- the isolation region 120 may not be exposed, so the sidewall spacers 160 are formed only on the sidewalls of the exposed BOX layer, as shown in FIG.
- a metal layer 150 covering the sidewall spacers 160 is formed in the trenches 140.
- the material of the metal layer 150 includes W, Al, TiAl, TiN or a combination thereof.
- the mask is removed, and optionally, a planarization process may be performed to make the upper surfaces of the metal layer 150, the SOI layer 100, and the isolation region 120 flush.
- a gate structure 200 is formed on a region covered by the aforementioned mask.
- sidewall spacers 210 may also be formed on both sides of the gate structure 200.
- the source/drain regions are formed in one step.
- the method provided in this embodiment may further include a step S206, specifically comprising: forming a dielectric layer 300 covering the gate structure 200 and the metal layer 150, and forming at least a portion of the dielectric layer 300 in each of the dielectric layers 300 a first contact hole 310 of the metal layer 150 and a second contact hole 320 exposing at least a portion of the gate structure 200.
- a step S206 specifically comprising: forming a dielectric layer 300 covering the gate structure 200 and the metal layer 150, and forming at least a portion of the dielectric layer 300 in each of the dielectric layers 300 a first contact hole 310 of the metal layer 150 and a second contact hole 320 exposing at least a portion of the gate structure 200.
- the semiconductor structure and the method of fabricating the same provided by the present invention first form a trench 140 extending to the BOX layer 110 on the SOI substrate, then forming a sidewall 160 on the sidewall of the trench 140, and finally forming in the trench
- the metal layer due to the presence of the sidewall 160 and the sidewall 160 having a controllable thickness, the metal layer 150 is further separated from the sidewall 160 of the SOI substrate by the sidewall 160, and the distance between the two is increased.
- the sidewall 160 occupies the surface of the partially exposed BOX layer 110, the area of the metal layer 150 facing the lower surface of the bulk silicon layer 130 is reduced, and the above distance becomes larger and the area is reduced so that the semiconductor device is in operation.
- the reduction in capacitance between the 150 and the bulk silicon layer 130 is advantageous for improving the performance of the semiconductor device, and also ensures that the area where the source and drain regions are in contact with the metal plug is sufficiently large.
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Abstract
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CN201190000059.0U CN203038895U (zh) | 2011-06-27 | 2011-08-25 | 一种半导体结构 |
US13/380,857 US8906753B2 (en) | 2011-06-27 | 2011-08-25 | Semiconductor structure and method for manufacturing the same |
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CN201110175568.3 | 2011-06-27 | ||
CN201110175568.3A CN102856198B (zh) | 2011-06-27 | 2011-06-27 | 一种半导体结构及其制造方法 |
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US20060131648A1 (en) * | 2004-12-17 | 2006-06-22 | Electronics And Telecommunications Research Institute | Ultra thin film SOI MOSFET having recessed source/drain structure and method of fabricating the same |
CN1328795C (zh) * | 2003-10-31 | 2007-07-25 | 北京大学 | 一种源漏下陷型超薄体soimos晶体管及其制作方法 |
CN101300670B (zh) * | 2005-10-31 | 2010-08-18 | 先进微装置公司 | 在薄soi晶体管中嵌入的应变层以及其形成方法 |
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KR100344220B1 (ko) * | 1999-10-20 | 2002-07-19 | 삼성전자 주식회사 | 에스·오·아이(soi) 구조를 갖는 반도체 소자 및 그 제조방법 |
KR100374554B1 (ko) * | 2000-09-22 | 2003-03-04 | 주식회사 하이닉스반도체 | 에스오아이 소자의 반도체 몸체-기판 접촉 구조 및 그제조방법 |
US6924517B2 (en) * | 2003-08-26 | 2005-08-02 | International Business Machines Corporation | Thin channel FET with recessed source/drains and extensions |
US7923782B2 (en) * | 2004-02-27 | 2011-04-12 | International Business Machines Corporation | Hybrid SOI/bulk semiconductor transistors |
US7271442B2 (en) * | 2005-01-12 | 2007-09-18 | International Business Machines Corporation | Transistor structure having stressed regions of opposite types underlying channel and source/drain regions |
US20080121985A1 (en) * | 2006-11-07 | 2008-05-29 | International Business Machines Corporation | Structure and method to improve short channel effects in metal oxide semiconductor field effect transistors |
US7659583B2 (en) * | 2007-08-15 | 2010-02-09 | International Business Machines Corporation | Ultrathin SOI CMOS devices employing differential STI liners |
US7541629B1 (en) * | 2008-04-21 | 2009-06-02 | International Business Machines Corporation | Embedded insulating band for controlling short-channel effect and leakage reduction for DSB process |
US20100171118A1 (en) * | 2009-01-08 | 2010-07-08 | Samar Kanti Saha | Junction Field-Effect Transistor Having Insulator-Isolated Source/Drain Regions and Fabrication Method Therefor |
US8669146B2 (en) * | 2011-01-13 | 2014-03-11 | International Business Machines Corporation | Semiconductor structures with thinned junctions and methods of manufacture |
US8466013B2 (en) * | 2011-06-30 | 2013-06-18 | Institute of Microelectronics, Chinese Academy of Sciences | Method for manufacturing a semiconductor structure |
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2011
- 2011-06-27 CN CN201110175568.3A patent/CN102856198B/zh active Active
- 2011-08-25 WO PCT/CN2011/078877 patent/WO2013000196A1/zh active Application Filing
- 2011-08-25 CN CN201190000059.0U patent/CN203038895U/zh not_active Expired - Lifetime
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CN1328795C (zh) * | 2003-10-31 | 2007-07-25 | 北京大学 | 一种源漏下陷型超薄体soimos晶体管及其制作方法 |
US20060131648A1 (en) * | 2004-12-17 | 2006-06-22 | Electronics And Telecommunications Research Institute | Ultra thin film SOI MOSFET having recessed source/drain structure and method of fabricating the same |
CN101300670B (zh) * | 2005-10-31 | 2010-08-18 | 先进微装置公司 | 在薄soi晶体管中嵌入的应变层以及其形成方法 |
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CN203038895U (zh) | 2013-07-03 |
CN102856198A (zh) | 2013-01-02 |
CN102856198B (zh) | 2015-06-24 |
US20140124859A1 (en) | 2014-05-08 |
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