EP1218942A1 - Dispositif semi-conducteur combinant les avantages des architectures massives et soi, et procede de fabrication - Google Patents
Dispositif semi-conducteur combinant les avantages des architectures massives et soi, et procede de fabricationInfo
- Publication number
- EP1218942A1 EP1218942A1 EP00966241A EP00966241A EP1218942A1 EP 1218942 A1 EP1218942 A1 EP 1218942A1 EP 00966241 A EP00966241 A EP 00966241A EP 00966241 A EP00966241 A EP 00966241A EP 1218942 A1 EP1218942 A1 EP 1218942A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- silicon
- source
- drain regions
- spacers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 71
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 67
- 239000010703 silicon Substances 0.000 claims abstract description 66
- 239000003989 dielectric material Substances 0.000 claims abstract description 29
- 125000006850 spacer group Chemical group 0.000 claims description 31
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 23
- 230000015572 biosynthetic process Effects 0.000 claims description 17
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 229910052732 germanium Inorganic materials 0.000 claims description 12
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 11
- 230000008030 elimination Effects 0.000 claims description 10
- 238000003379 elimination reaction Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000002019 doping agent Substances 0.000 claims description 8
- 238000005530 etching Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 238000000407 epitaxy Methods 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 5
- 238000002513 implantation Methods 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 description 11
- 239000012212 insulator Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- 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
- H01L29/66742—Thin film unipolar transistors
- H01L29/66772—Monocristalline silicon transistors on insulating substrates, e.g. quartz substrates
-
- 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
- H01L29/40—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 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
- H01L29/40—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
- H01L29/41775—Source or drain electrodes for field effect devices characterised by the proximity or the relative position of the source or drain electrode and the gate electrode, e.g. the source or drain electrode separated from the gate electrode by side-walls or spreading around or above the gate electrode
- H01L29/41783—Raised source or drain electrodes self aligned with the gate
-
- 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
- H01L29/78651—Silicon transistors
- H01L29/78654—Monocrystalline silicon transistors
Definitions
- the present invention relates generally to high performance CMOS semiconductor devices for the rapid processing of signals and / or low voltage / low power apphcations and more particularly to MOS field effect transistors (MOSFET).
- MOSFET MOS field effect transistors
- the new architecture called "SON" Silicon on None
- SOI silicon on insulator
- MOSFETs of silicon on insulator (SOI) architecture One of the limiting factors of conventional solid architecture MOSFETs is the substrate effect which affects the performance of the transistor. This drawback is avoided in MOSFETs of silicon on insulator (SOI) architecture by separating the thin silicon film from the substrate by a buried layer of silicon oxide.
- SOI silicon on insulator
- ultrathin SOI architecture MOSFETs suffer from high source / drain resistance (S / D) due to shallow junctions limited by the thickness of the silicon layer and poor thermal conductivity.
- S / D source / drain resistance
- the cost of manufacturing SOI architectural substrates is high, which has limited their introduction to the market.
- FIG. 1 a semiconductor device has been proposed as shown in FIG. 1, comprising a silicon substrate 10 in which source 23 and drain 24 regions are formed, a thin dielectric layer of gate 14 on the channel region and a gate 15 on the thin layer of gate dielectric 14, a buried layer of dielectric material 22 extending between the source and drain regions and a thin layer of silicon 13 included between the layer of buried dielectric material 22 and the gate dielectric layer 14, constituting the channel region of the device between the source and drain regions 23, 24.
- the layer of buried dielectric material 22 may consist of a cavity filled with air.
- the object of the invention is therefore to modify the architecture of the junctions of the device described above, so as to make safe and easy contact between the thin layer of silicon constituting the channel and the source and drain regions.
- the invention also relates to a method for producing such a device.
- the semiconductor device comprises a silicon body in which are formed source and drain regions defining between them a channel region, a thin layer of gate dielectric on the channel region and a gate on the thin layer of gate dielectric, a buried layer of dielectric material and a thin layer of silicon extending between the source and drain regions and comprised between the layer of buried dielectric material and the layer of gate dielectric, the thin layer of silicon having an area greater than that of the gate dielectric layer so that its upper surface has two opposite zones which extend beyond the gate dielectric layer, the source and drain regions covering respectively each, at least in part, one of said opposite zones.
- the layer of buried dielectric material extends between the source and drain regions.
- the layer of buried dielectric material extends over the entire surface of the silicon body under the source and drain regions.
- the device can be a planar structure device in which the surfaces of the source and drain regions and of the gate region on which the contacts are made, lie in the same plane.
- the layer of buried dielectric material has a thickness of 1 to 50 nm, for example of the order of 10 nm.
- the layer of dielectric material buried is preferably located below these extensions and preferably still adjacent to these extensions.
- the layer of buried dielectric material can be made of any suitable solid or gaseous dielectric material but is preferably a cavity filled with air.
- the thin layer of silicon forming the channel of the device generally has a thickness of 1 to 50 nm.
- the exposed areas of the silicon layer then make it possible to start the (selective) epitaxy of the source and drain regions.
- the length of each of the exposed areas of the thin layer of silicon is equal to the thickness of each of the second spacers, generally ⁇ 100 nm.
- the invention also relates to a method of manufacturing the semiconductor device according to the invention.
- the method of the invention comprises:
- the formation of the source and drain regions comprises the selective epitaxy of silicon to form, on either side of the first spacers, precursor polycrystalline silicon deposits of the future source and drain regions , and covering, at least in part, the exposed areas of the thin layer of silicon, the elimination of the hard gate mask and the implantation of a dopant in the polycrystalline silicon deposits to form the source and drain regions .
- the formation of the source and drain regions comprises the deposition of a thick layer of polycrystalline silicon coating, the formation on the thick layer of polycrystalline silicon of a resin mask, the etching of the thick layer, elimination of the mask, chemical mechanical polishing of the thick layer of polycrystalline silicon up to the level of the grid to produce parts intended to form the future source and drain regions coplanar with the grid and implanting dopant in these remaining parts of the thick layer of polycrystalline silicon to form source and drain regions covering the exposed areas of the thin layer of silicon.
- the method of the invention comprises before the step of forming the first spacers, a step of implanting dopant to form extensions of the source and drain regions, and after formation of the first spacers, a step of implantation of dopant (overdoping of the source and drain regions).
- SiGe alloys are well known and mention may be made of Si, . ⁇ Ge ⁇ where 0 ⁇ x ⁇ l and Si, Ge ⁇ Cy where 0 ⁇ x ⁇ 0.95 and 0 ⁇ y ⁇ 0.05.
- the SiGe alloys have a relatively high germanium content (x> 0.1 l; preferably 0.1 l ⁇ x ⁇ 0.3) for better etch selectivity compared to silicon and Si0 2 .
- germanium or of the SiGe alloy can be done by any known process, for example by means of an oxidizing chemistry such as a solution 40 ml HNO s 70% + 20 ml H 2 0 2 + 5 ml HF 0.5%, or by isotropic plasma attack.
- an oxidizing chemistry such as a solution 40 ml HNO s 70% + 20 ml H 2 0 2 + 5 ml HF 0.5%, or by isotropic plasma attack.
- Figure 1 - a schematic sectional view of an embodiment of a SON-MOSFET having conventional source and drain regions;
- Figure 2 - a schematic sectional view of an embodiment of a SON-MOSFET according to the invention
- Figure 3 a schematic sectional view of another embodiment of a SON-MOSFET according to the invention.
- FIGS. 4a to 4i schematic sectional views of the main steps of a first embodiment of the method of manufacturing a SON-MOSFET according to the invention
- FIGS. 5a to 5i schematic sectional views of the main steps of a second embodiment.
- SON-MOSFET which comprises, as is conventional, a silicon body 10 having an upper surface and source and drain regions 23, 24 defining between them a channel region.
- the source and drain regions 23, 24 have extensions 13 'located in the channel region.
- the upper surface of the body 10 is coated with a thin layer of a gate dielectric 14, for example Si0 2 , and a gate 15 of polycrystalline silicon is formed above the channel region and flanked by spacers 17, 18, for example in Si 3 N 4 or Si0 2 .
- the structure is coated with a coating material 26 and contacts 25 are provided on the source and drain regions 23, 24 and the grid 15.
- the structure which has just been described is a conventional MOSFET structure.
- an air-filled cavity or a layer of a suitable solid dielectric material 22 bridges the source and drain regions 23, 24 below the grid 15, so as to isolate a thin layer of silicon 13 from the rest of the silicon body 10.
- This thin layer of silicon 13 constitutes the channel of the transistor.
- the thin layer of silicon 13 generally has a thickness of
- the thickness of the air-filled cavity or of the layer of solid dielectric material 22 is from 1 to 50 nm, preferably of the order of 10 nm.
- the thin layer of silicon 13 constituting the channel has an area greater than the gate dielectric layer 14, so that its upper surface has two exposed areas 13a extending beyond the dielectric layer of grid 14, on either side of the spacers 17, 18.
- the source and drain regions 23, 24 have extensions 23a, 24a, each covering, at least in part, one of the two exposed zones 13a of the thin silicon layer 13, respectively.
- FIG. 3 shows another embodiment of a SON-MOSFET according to the invention, having a planar structure, that is to say that the upper surfaces of the source and drain regions and of the grid on which are made the contacts are in the same plane.
- This device differs from the device of FIG. 2, in addition to planarization, only in that the layer of buried dielectric material 22 extends over the entire surface of the silicon body 10, immediately below the source and drain regions. 23, 24.
- FIGS. 4a to 4i a first embodiment of the method of the invention for the manufacture of a SON-MOSFET as shown in FIG. 2.
- epitaxy for example by chemical vapor deposition
- a grid oxide layer 14 (Si0 2 ), then on this grid oxide layer 14, a grid 15 made of polycrystalline silicon.
- lightly doped zones 13 in the thin layer of silicon 17, zones which will later be used to form the extensions of the source and drain regions.
- a hard mask 16 for example a layer of silicon oxynitride, as is well known, and the first spacers 17 are formed in known manner on the opposite sides of the grid 15 and of the hard mask 16, 18 in Si 3 N 4 .
- the gate oxide layer 14 is etched, on each side of the second spacers 19, 20, as shown in Figure 4d, for example by means of a plasma, the gate oxide layer 14, the thin layer of silicon 13, and possibly a part upper layer of Ge or AlUage SiGe
- the material is selectively removed from the layer 12 to form a tunnel 21, as shown in Figure 4e.
- the tunnel 21 can be filled with an appropriate solid dielectric material 22.
- the second spacers 19, 20 and the underlying parts of the gate oxide layer 14 are then eliminated in order to discover on the surface of the thin silicon layer 13 two zones 13a situated on the side and other of the first spacers 17, 18.
- the layer of dielectric material 22 is eliminated on either side of the silicon layer (deoxidation in the case of a layer of Si0 2 ) in order to start the epitaxy of the source regions and of drain.
- the dopant is implanted in the polycrystalline silicon deposits 23, 24 and in the gate 15 (FIG. 4h).
- FIGS. 5a to 5i show a second embodiment of the method of the invention which makes it possible to obtain a MOSFET according to the invention with a planar structure as shown in FIG. 3.
- a layer of dielectric material 22 is produced filling the tunnel and covering the junctions of the main surface of the substrate where the source and drain regions will be formed later (FIG. 5f).
- the entire structure is covered with a thick layer of polycrystalline silicon 27, then with a resin mask 28.
- the thick layer of polycrystalline silicon 27 is then etched in a conventional manner using resin mask of the desired size and geometry.
- the lateral insulation 11 has been shown, in order to give a reference for the etching of the polycrystalline silicon layer 27. For reasons of simplification, this insulation 11 has not been shown in the other figures.
- a conventional mechanical-chemical polishing of the thick polycrystalline silicon layer 27 is then carried out until complete removal of the hard grid mask 16, so as to produce regions of the polycrystalline silicon 23, 24 , intended to form the future source and drain regions having extensions 23a, 24a which cover the uncovered areas 13a of the thin layer of silicon 13.
- the structure obtained is a planar structure, that is to say that the upper surfaces of the regions 23, 24 and of the grid 15 are located in the same plane.
- the device is completed as before by conventional formation of contacts 25 and of an encapsulation 26.
- the devices, in particular the planar devices, according to the invention, the structure of which is close to that of SOI devices manufactured using a silicon on insulator substrate, and their manufacturing methods, have many advantages over these SOI devices. First of all, they do not require the use of an expensive SOI substrate which most often requires a step of thinning the thickness of the silicon.
- the silicon layer in the methods of the invention being formed by epitaxy can have an arbitrarily thin thickness.
- the process of the invention allows very thin thicknesses of the layer of buried dielectric material (or solid material), of the order of a few nanometers compared to the hundreds of nanometers for conventional SOI, which has an advantage from the point of view of eliminating the effects of short channels. Better thermal contact is obtained between the channel and the substrate, thanks to the layer of buried dielectric material and also thanks to the fact that this layer does not extend beyond the grid area.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9912308 | 1999-10-01 | ||
FR9912308A FR2799307B1 (fr) | 1999-10-01 | 1999-10-01 | Dispositif semi-conducteur combinant les avantages des architectures massives et soi, procede de fabrication |
PCT/FR2000/002710 WO2001026160A1 (fr) | 1999-10-01 | 2000-09-29 | Dispositif semi-conducteur combinant les avantages des architectures massives et soi, et procede de fabrication |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1218942A1 true EP1218942A1 (fr) | 2002-07-03 |
Family
ID=9550508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00966241A Withdrawn EP1218942A1 (fr) | 1999-10-01 | 2000-09-29 | Dispositif semi-conducteur combinant les avantages des architectures massives et soi, et procede de fabrication |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1218942A1 (fr) |
FR (1) | FR2799307B1 (fr) |
WO (1) | WO2001026160A1 (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020142526A1 (en) * | 2001-03-30 | 2002-10-03 | International Business Machines Corporation | Structures and methods to minimize plasma charging damage in silicon on insulator devices |
US7078298B2 (en) * | 2003-05-20 | 2006-07-18 | Sharp Laboratories Of America, Inc. | Silicon-on-nothing fabrication process |
US7015147B2 (en) * | 2003-07-22 | 2006-03-21 | Sharp Laboratories Of America, Inc. | Fabrication of silicon-on-nothing (SON) MOSFET fabrication using selective etching of Si1-xGex layer |
US6964911B2 (en) * | 2003-09-23 | 2005-11-15 | Freescale Semiconductor, Inc. | Method for forming a semiconductor device having isolation regions |
FR2865850B1 (fr) | 2004-02-03 | 2006-08-04 | St Microelectronics Sa | Procede de realisation d'un transistor a effet de champ et transistor ainsi obtenu |
US7256077B2 (en) * | 2004-05-21 | 2007-08-14 | Freescale Semiconductor, Inc. | Method for removing a semiconductor layer |
JP4759967B2 (ja) * | 2004-10-01 | 2011-08-31 | セイコーエプソン株式会社 | 半導体装置の製造方法 |
JP2006156867A (ja) | 2004-12-01 | 2006-06-15 | Seiko Epson Corp | 半導体基板の製造方法および半導体装置の製造方法 |
WO2007003220A1 (fr) * | 2005-06-30 | 2007-01-11 | Freescale Semiconductor, Inc | Procédé de formation d'une structure semi-conductrice |
US20070194353A1 (en) * | 2005-08-31 | 2007-08-23 | Snyder John P | Metal source/drain Schottky barrier silicon-on-nothing MOSFET device and method thereof |
FR2897202B1 (fr) * | 2006-02-08 | 2008-09-12 | St Microelectronics Crolles 2 | Transistor mos a barriere de schottky sur film semi-conducteur entierement appauvri et procede de fabrication d'un tel transistor. |
US8304301B2 (en) * | 2009-11-18 | 2012-11-06 | International Business Machines Corporation | Implant free extremely thin semiconductor devices |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6020582A (ja) * | 1983-07-14 | 1985-02-01 | Nec Corp | Misトランジスタ及びその製造方法 |
JP3484726B2 (ja) * | 1992-07-16 | 2004-01-06 | 富士通株式会社 | 半導体装置およびその製造方法 |
US5405795A (en) * | 1994-06-29 | 1995-04-11 | International Business Machines Corporation | Method of forming a SOI transistor having a self-aligned body contact |
FR2750534B1 (fr) * | 1996-06-27 | 1998-08-28 | Commissariat Energie Atomique | Transistor et procede de realisation d'un transistor a contacts et a isolation de champ auto-alignes |
US5773331A (en) * | 1996-12-17 | 1998-06-30 | International Business Machines Corporation | Method for making single and double gate field effect transistors with sidewall source-drain contacts |
-
1999
- 1999-10-01 FR FR9912308A patent/FR2799307B1/fr not_active Expired - Fee Related
-
2000
- 2000-09-29 WO PCT/FR2000/002710 patent/WO2001026160A1/fr not_active Application Discontinuation
- 2000-09-29 EP EP00966241A patent/EP1218942A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0126160A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2799307A1 (fr) | 2001-04-06 |
FR2799307B1 (fr) | 2002-02-15 |
WO2001026160A1 (fr) | 2001-04-12 |
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