WO2005020314A1 - 空洞を有するシリコン基板上の高移動度misfet半導体装置及びその製造方法 - Google Patents
空洞を有するシリコン基板上の高移動度misfet半導体装置及びその製造方法 Download PDFInfo
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- WO2005020314A1 WO2005020314A1 PCT/JP2004/011988 JP2004011988W WO2005020314A1 WO 2005020314 A1 WO2005020314 A1 WO 2005020314A1 JP 2004011988 W JP2004011988 W JP 2004011988W WO 2005020314 A1 WO2005020314 A1 WO 2005020314A1
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- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 169
- 239000010703 silicon Substances 0.000 title claims abstract description 169
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 162
- 239000000758 substrate Substances 0.000 title claims abstract description 70
- 239000004065 semiconductor Substances 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 230000007547 defect Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 47
- 229910052732 germanium Inorganic materials 0.000 claims description 30
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000005468 ion implantation Methods 0.000 claims description 14
- 239000011229 interlayer Substances 0.000 claims description 13
- 230000005669 field effect Effects 0.000 claims description 10
- 238000005530 etching Methods 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 238000002048 anodisation reaction Methods 0.000 claims description 3
- 229910000577 Silicon-germanium Inorganic materials 0.000 abstract description 6
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000010408 film Substances 0.000 description 102
- -1 helium ions Chemical class 0.000 description 19
- 239000010410 layer Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000005229 chemical vapour deposition Methods 0.000 description 10
- 229910052814 silicon oxide Inorganic materials 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000012535 impurity Substances 0.000 description 8
- 229910052785 arsenic Inorganic materials 0.000 description 6
- 229910052796 boron Inorganic materials 0.000 description 6
- 238000007687 exposure technique Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 229910021426 porous silicon Inorganic materials 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- HAYXDMNJJFVXCI-UHFFFAOYSA-N arsenic(5+) Chemical compound [As+5] HAYXDMNJJFVXCI-UHFFFAOYSA-N 0.000 description 2
- 125000001475 halogen functional group Chemical group 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910021334 nickel silicide Inorganic materials 0.000 description 2
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 241000652704 Balta Species 0.000 description 1
- 101100208473 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) lcm-2 gene Proteins 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H01L29/7842—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate
-
- 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
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/764—Air gaps
-
- 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
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/10—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1025—Channel region of field-effect devices
- H01L29/1029—Channel region of field-effect devices of field-effect transistors
- H01L29/1033—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure
- H01L29/1054—Channel region of field-effect devices of field-effect transistors with insulated gate, e.g. characterised by the length, the width, the geometric contour or the doping structure with a variation of the composition, e.g. channel with strained layer for increasing the mobility
-
- 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
- H01L21/823412—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type with a particular manufacturing method of the channel structures, e.g. channel implants, halo or pocket implants, or channel materials
Definitions
- High mobility MISFET semiconductor device on silicon substrate having cavity and manufacturing method thereof having cavity and manufacturing method thereof
- the present invention relates to a MISFET semiconductor device having a high mobility silicon channel and a method for manufacturing the same.
- Non-Patent Document 1 This means that by applying a biaxial tensile stress to the silicon film serving as the channel region, the effective mobility is increased by increasing the occupancy probability of the electrons in the double degenerate valley where the electrons have a small effective mass. It was used.
- Non-Patent Document 2 discloses a similar technique.
- FIG. 1 shows a conventional substrate structure.
- a concentration-graded silicon 'germanium film 2 having a concentration gradient is formed on a normal silicon substrate 1, then a lattice-relaxed silicon' germanium film 3 is formed, and a strained silicon film 4 is formed.
- a silicon substrate is manufactured.
- Non-Patent Document 5 a technique has been proposed in which a strained silicon film is formed on a silicon oxide film on a silicon substrate by shellfish divination SII technology. This is shown in Non-Patent Document 5.
- Non-Patent Document 6 discloses a process using light element ion implantation and heat treatment.
- Patent Document 1 discloses a process using etching and heat treatment under reduced pressure of hydrogen.
- Patent Document 2 discloses a technique using a porous silicon film formed by an anodization technique.
- the thermal instability of the porous silicon film has been pointed out.
- MOSFETs with a gate length of less than about 100 nm the heat treatment is significantly reduced, and thermal instability is not a problem.
- Patent Document 3 discloses that SOI thinning reduces energy degeneracy of the electronic state of the conduction band in the inversion layer and reduces the effective mass.
- a technology has been shown in which small electrons are preferentially induced to improve mobility.
- this is a high mobility technology based on SOI thinning, which is different from a high mobility technology using strain.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-12858
- Patent Document 2 Patent No. 3257580
- Patent Document 3 JP 2001-257358A
- Non-patent document 1 J. Welser, et al .: '' NM ⁇ S and PMOS Transistor Fabricated in Strained Silicon / Relaxed Silicon— Germanium Structure, IEEE International Electron Device Meeting, pp. 1000, 1992.
- Non-Patent Document 2 ⁇ A. Fitzgerald, et al .: '' MOSFET Channel Engine ering using Strained 3 ⁇ 4i, 3 ⁇ 4iGe, and Ge Channels, Extended Abst racts of the 2002 International Conference on Solid State Devices and Materials, pp. 144--145, 2002.
- Non-Patent Document 3 K. Rim, et al .: Mobility Enhancement in Strained Si NMOSFETs with Hf02 Gate Dielectrics, "2002 Symposium on VLSI Technology Digest of Technical Papers, pp. 12-13, 2002
- Non-Patent Document 4 K . ⁇ ta, et al .: '' Novel Locally Strained Channel Tec hnique for High Performance 55 nm CMOS, ⁇ EEE International Electron Device Meeting, pp. 27, 2002.
- Non-Patent Document 5 T.A.Langdo, et al .: '' Preparation of Novel SiGe—Free Strained Si on Insulator Substrates, IEEE International SOI
- Non-Patent Document 6 Atsusm Ogura: Reduction of Pattern—Edge Defects in Partial SOI by LII (Light—Ion Implantation) Technique, Extended Abstracts of the 2002 International Conference on Solid State Devices and Materials, pp. 790-791, 2002.
- the first problem is to reduce defects in the strained silicon film of about 105 cm ⁇ 2, which are caused by the lattice constant difference between the silicon substrate and the silicon 'germanium film.
- CMP chemical mechanical polishing
- tensile stress is applied to the silicon film due to the difference in thermal expansion coefficient between the interlayer insulating film and the silicon substrate.
- the stress there is a limit to the stress that can be applied due to the rigidity of the silicon substrate.
- the technology of forming a strained silicon film on a silicon oxide film on a silicon substrate by using a combined SOI technology since an SOI substrate is used, it is necessary to design a circuit in consideration of a substrate floating effect, self-heating, and the like. Yes, poor versatility.
- An object of the present invention is to provide a high mobility strained silicon substrate having low cost and low defect density.
- the semiconductor device according to claim 1, comprising a MIS (metal-insulating film-silicon) type field effect transistor, wherein the lattice-relaxed silicon is formed on a silicon substrate having a cavity. It has a strained silicon channel to which a tensile stress is applied on a germanium film.
- MIS metal-insulating film-silicon
- the semiconductor device according to claim 2 is a semiconductor device provided with an MIS (metal-insulating film-silicon) field effect transistor, wherein the semiconductor device is formed on a silicon substrate having a cavity.
- MIS metal-insulating film-silicon
- At least the silicon substrate in a region where a part of the MOSFET is formed can have a cavity.
- the shape of the cavity to be formed may be such that the length of the cavity in the direction parallel to the surface of the silicon substrate is longer than the length of the cavity in the depth direction of the silicon substrate. it can.
- the shape of the cavity to be formed may be such that the length of the cavity in the depth direction of the silicon substrate is longer than the length of the cavity in the direction parallel to the surface of the silicon substrate. it can.
- the shape of the formed cavity may be such that the length of the cavity in the direction parallel to the surface of the silicon substrate is equal to the length of the cavity in the depth direction of the silicon substrate.
- a force S can be applied so that cavities are periodically formed in a direction parallel to the surface of the silicon substrate.
- Lattice-relaxed silicon 'tensile stress can be applied on germanium film Forming a strained silicon channel, forming a defect by ion implantation, and forming a cavity by a subsequent heat treatment.
- the heat treatment can be performed in an atmosphere containing oxygen.
- a method for manufacturing a semiconductor device which is a method for manufacturing a semiconductor device including an MIS (metal-insulating film-silicon) type field effect transistor, wherein the semiconductor device is formed on a silicon substrate having a cavity Forming a strained silicon channel to which a tensile stress is applied on a lattice-relaxed silicon 'germanium film, a step of performing anodization, and a step of forming a cavity by a subsequent heat treatment.
- MIS metal-insulating film-silicon
- a method for manufacturing a semiconductor device which is a method for manufacturing a semiconductor device provided with an MIS (metal-insulating film-silicon) type field effect transistor, wherein the semiconductor device is formed on a silicon substrate having a cavity. Forming a strained silicon channel to which a tensile stress is applied, a step of etching a silicon substrate, and a step of forming a cavity by a subsequent heat treatment on the germanium film.
- the heat treatment can be performed in an atmosphere containing hydrogen.
- the present invention has the following effects. That is, by using a silicon substrate having a silicon layer having a cavity, a silicon layer having a tensile strain can be formed, the mobility of electrons and holes can be improved, and the performance of the MISFET can be improved. In addition, a significant cost reduction can be achieved compared to a conventional high mobility device using a strained silicon channel using a concentration-graded silicon 'germanium film and a lattice-relaxed silicon' germanium film.
- a normal silicon substrate 1 is mainly used.
- helium ions are implanted under the conditions of 20 keV and 2 * 1016 cm-2 in order to form the silicon layer 12 having a cavity.
- the multiplication is represented by “*”.
- a lattice-relaxed silicon-germanium film 3 having a thickness of 0.5 m is formed at 550 ° C.
- a strained silicon film 4 having a thickness of 15 nm is formed at 550 ° C.
- the germanium concentration of the lattice-relaxed silicon 'genolemanium film 3 is 20%.
- the thickness of the strained silicon film 4 needs to be equal to or less than the critical thickness.
- FIG. 2A A cross-sectional view showing the structure at this point is shown in FIG. 2A.
- an element isolation region 5 is formed by a normal shallow trench element isolation (STI) technique.
- a well and a channel region are formed by a normal ion implantation technique. For example, using conventional exposure techniques, boron ions are implanted into the nMOSFET at 15 keV and 5E12 cm-2, and arsenic ions are implanted into the pMOSFET at 100 keV and 5E12 cm_2.
- a gate insulating film 6 is formed.
- silicon oxynitride with a thickness of 1.2 nm by a thermal oxidation process at 950 ° C in a mixed gas of oxygen nitride gas (NO) and oxygen.
- NO oxygen nitride gas
- a polycrystalline silicon film is deposited to a thickness of 75 nm by a normal CVD method as a gate electrode.
- a polycrystalline silicon gate electrode 7 is formed by a usual exposure technique and etching technique. A cross-sectional view showing the structure at this point is shown in FIG. 2B.
- impurities in a halo region 91 are introduced by ordinary oblique ion implantation.
- BF2 ion is 30 keV
- arsenic ion 60 keV
- impurities in the source / drain / extension (SDE) region 9 are introduced by normal ion implantation.
- SDE source / drain / extension
- a silicon oxide film is deposited to a thickness of 10 nm by a normal CVD method, and then a silicon nitride film is deposited to a thickness of 40 nm by a normal CVD method. Further, by performing ordinary anisotropic dry etching, the silicon oxide film 8 on the gate electrode side wall and the gate electrode side wall nitride film are formed. A silicon oxide film 81 is formed.
- impurities are introduced into the source / drain regions 92 by an ion implantation method.
- boron ions are implanted into the nMOSFET at 2 keV and 3E15 cm-2, and arsenic ions are implanted into the pMOSFET at 30 keV and 3E15 cm_2 from the normal direction of the wafer.
- a heat treatment for activating the impurities is performed. For example, spike annealing at 1050 ° C and 0 seconds is performed at a temperature rise of 300 ° C / sec and a temperature decrease of 100 ° C / sec.
- a silicide film is formed only on the gate electrode and the source / drain regions 92 by a normal process.
- a nickel film having a thickness of about 10 nm is formed by a normal sputtering method, and a titanium nitride film having a thickness of about 30 nm is formed by a normal sputtering method.
- Heat treatment is performed to form a nickel silicide film 93. Thereafter, the excess titanium nitride film and nickel film are removed by ordinary wet etching.
- an interlayer insulating film 10 of a silicon oxynitride film is formed using a normal plasma CVD method or the like. Further, the contact 11 and the wiring are formed to complete the MISFET. A cross-sectional view showing the structure at this point is shown in FIG. 2C.
- the strained silicon film 4 Since the silicon film in contact with the cavity in the silicon substrate 1 is in an unconstrained state, the strained silicon film 4 has a high degree of freedom with respect to a change in the lattice constant. As a result, a strained silicon channel with few threading dislocations can be formed even by using the thin-film concentration-gradient silicon 'germanium film 21 and the thin-film lattice-relaxed silicon' germanium film 31.
- the cost can be significantly reduced.
- a normal silicon substrate 1 is mainly used.
- helium ions are injected under the conditions of 20 keV and 2 * 1016 cm_2 to form the silicon layer 12 having a cavity.
- an element isolation region 5 is formed by a normal shallow trench element isolation (STI) technique.
- a well and a channel region are formed by a normal ion implantation technique. For example, using conventional exposure techniques, boron ions are implanted into the nMOSFET at 15 keV and 5E12 cm-2, and arsenic ions are implanted into the pMOSFET at 100 keV and 5E12 cm_2.
- the gate insulating film 6 is formed. For example, using a normal rapid heating process (RTP) device, oxynitriding in a mixed gas of oxygen nitride gas (N ⁇ ) and oxygen to a thickness of 1.2 nm by thermal oxidation at 950 ° C. A silicon film is formed. Next, a polycrystalline silicon film is deposited to a thickness of 75 nm by a normal CVD method as a gate electrode. Next, a polycrystalline silicon gate electrode 7 is formed by a usual exposure technique and etching technique. A cross-sectional view showing the structure at this point is shown in FIG. 3B.
- RTP rapid heating process
- impurities in a halo region 91 are introduced by ordinary oblique ion implantation.
- BF2 ion is 30keV
- arsenic ion is 60keV
- SDE region 9 impurities in the source'drain.extension (SDE) region 9 are introduced by normal ion implantation.
- arsenic ions are implanted into the nMOSFET at 2 keV and 5E14 cm_2, and boron ions are implanted into the pMOSFET at 0.5 keV and 5E14 cm_2.
- a silicon oxide film is deposited to a thickness of 10 nm by a normal CVD method, and then a silicon nitride film is deposited to a thickness of 40 nm by a normal CVD method. Further, by performing ordinary anisotropic dry etching, a gate electrode side wall silicon oxide film 8 and a gate electrode side wall silicon nitride film 81 are formed.
- impurities are introduced into the source / drain regions 92 by an ion implantation method.
- boron ions are implanted into the nMOSFET at 2 keV and 3E15 cm_2, and arsenic ions into the pMOSFET at 30 keV and 3E15 cm_2 from the normal direction of the wafer.
- a heat treatment for activating the impurities is performed. For example, temperature rise 300 degrees / second, temperature fall 100 degrees Perform a spike anneal at 1050 ° C for 0 sec.
- a silicide film is formed only on the gate electrode and the source and drain regions by a normal process.
- a nickel film with a thickness of about 10 nm is formed by a normal sputtering method
- a titanium nitride film with a thickness of about 30 nm is formed by a normal sputtering method, and then at 450 ° C. for 30 seconds.
- Heat treatment is performed to form a nickel silicide film 93. Thereafter, the excess titanium nitride film and nickel film are removed by ordinary wet etching.
- an interlayer film (tensile stress-applied interlayer insulating film) 101 of a silicon oxynitride film is formed using a normal plasma CVD method.
- the interlayer film is characterized in that a film having a smaller thermal expansion coefficient than silicon is used, and tensile strain is applied to the silicon substrate 1 by cooling after the subsequent heat treatment.
- the tensile strain is also characterized by a biaxial stress orthogonal to a plane perpendicular to the substrate surface.
- a larger strain can be applied to the silicon layer 12 having a cavity than the normal silicon substrate 1.
- the contact 11 and the wiring are formed to complete the MISFET.
- a cross-sectional view showing the structure at this point is shown in Figure 3C.
- the lattice-relaxed silicon film 41 Since the silicon film in contact with the cavity in the silicon substrate 1 is in an unbounded state, the lattice-relaxed silicon film 41 has a high degree of freedom with respect to a change in the lattice constant. Thus, the stress of the interlayer film (tensile stress applying interlayer insulating film) 101 of the silicon oxynitride film can be effectively applied to the lattice-relaxed silicon film 41, and a strained silicon channel with few threading dislocations can be formed.
- the stress of the interlayer film (tensile stress applying interlayer insulating film) 101 of the silicon oxynitride film can be effectively applied to the lattice-relaxed silicon film 41, and a strained silicon channel with few threading dislocations can be formed.
- the thickness of the lattice-relaxed silicon film 41 is smaller than that of a conventional high-mobility device using a strained silicon channel using the concentration-graded silicon 'germanium film 2 and the lattice-relaxed silicon' germanium film 3. In addition, a significant cost reduction can be realized.
- a normal silicon substrate 1 is mainly used.
- a silicon oxide film hard mask 13 for blocking helium ion implantation in which a region for forming a cavity is opened is formed.
- a silicon oxide film is formed to a thickness of 1 ⁇ m by a normal CVD method. Further, an opening is formed by a normal exposure technique and a dry etching method. Next, create cavities in some areas Helium ions are implanted under the conditions of 20 keV and 2 * 1016 cm-2 to form a silicon layer 14 having the same. A cross-sectional view showing the structure at this point is shown in FIG. 4A.
- 550 is obtained by a normal ultra high vacuum (UHV) CVD method.
- UHV ultra high vacuum
- Form a 500 nm thick silicon film with C Through this step, the silicon substrate 1 having the lattice-relaxed silicon film 41 can be formed on the silicon layer 14 having a cavity in a part of the region.
- a cross-sectional view showing the structure at this point is shown in FIG. 4C.
- the thermal conductivity per unit area is low in MISF ET where the cavity exists. If an element in which current flows excessively, such as an IZ ⁇ element, especially an ESD element, is formed in that area, the performance of the element is degraded due to heat generation. Therefore, by forming such a device in a region without voids, it is possible to suppress the deterioration of the device performance due to heat generation and to improve the mobility of the MISFET in which heat generation is not significant.
- the lattice relaxation of the lattice-relaxed silicon-germanium film 3 formed on the silicon substrate 1 having a cavity is promoted.
- the film structure is a strained silicon / lattice relaxed silicon.germanium / concentration gradient silicon.germanium / silicon layer with cavity Z silicon substrate.
- dislocations are terminated in the cavity to reduce the defect density, and furthermore, the lattice constant variability of the concentration-graded silicon-germanium film on the cavity is improved, and the film thickness can be reduced.
- the stress flexibility of the silicon film formed on the silicon substrate having the cavity is improved. That is, the film structure is strained silicon / silicon layer having cavities / silicon substrate.
- This structure reduces the defect density by terminating dislocations in the cavity, and also increases the stress flexibility of the silicon layer above the cavity. Therefore, the stress of the interlayer film force can be effectively applied. As a result, mobility improvement can be realized by a strained silicon channel that can be formed with low defect and low cost.
- the present invention can be applied to any MISFET semiconductor device having a high-mobility silicon channel and a method of manufacturing the same, and there is no limitation on the possibility of its use. Not something.
- FIG. 1 is a conceptual plan view of an example of a MISFET semiconductor device having a high mobility strained silicon channel realized by a conventional silicon 'germanium film.
- FIG. 2A is a cross-sectional view showing a structure of an example of a high-mobility MISFET semiconductor device on a silicon substrate having a cavity according to the present invention.
- FIG. 2B is a cross-sectional view showing a structure of an example of a high-mobility MISFET semiconductor device on a silicon substrate having a cavity according to the present invention.
- FIG. 2C is a cross-sectional view showing a structure of an example of a high-mobility MISFET semiconductor device on a silicon substrate having a cavity according to the present invention.
- FIG. 3A is a cross-sectional view showing a structure of an example of a high-mobility MISFET semiconductor device on a silicon substrate having a cavity according to the present invention.
- FIG. 3B is a cross-sectional view showing a structure of an example of a high-mobility MISFET semiconductor device on a silicon substrate having a cavity according to the present invention.
- FIG. 3C is a cross-sectional view showing a structure of an example of a high-mobility MISFET semiconductor device on a silicon substrate having a cavity according to the present invention.
- FIG. 4A is a cross-sectional view showing a structure of an example of a method for forming a silicon substrate having a cavity in a partial region according to the present invention.
- Garden 4B is a cross-sectional view showing a structure of an example of a method for forming a silicon substrate having a cavity in a partial region according to the present invention.
- Garden 4C is a cross-sectional view showing a structure of an example of a method for forming a silicon substrate having a cavity in a partial region according to the present invention.
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CN102867852A (zh) * | 2011-07-04 | 2013-01-09 | 中国科学院微电子研究所 | 晶体管及晶体管的形成方法 |
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JP2001144276A (ja) * | 1999-08-31 | 2001-05-25 | Toshiba Corp | 半導体基板およびその製造方法 |
JP2003178975A (ja) * | 2001-12-11 | 2003-06-27 | Sharp Corp | 半導体装置及びその製造方法 |
JP2003178977A (ja) * | 2001-12-12 | 2003-06-27 | Matsushita Electric Ind Co Ltd | 半導体結晶及びその製造方法 |
JP2004146472A (ja) * | 2002-10-22 | 2004-05-20 | Sharp Corp | 半導体装置及び半導体装置製造方法 |
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JP2001144276A (ja) * | 1999-08-31 | 2001-05-25 | Toshiba Corp | 半導体基板およびその製造方法 |
JP2003178975A (ja) * | 2001-12-11 | 2003-06-27 | Sharp Corp | 半導体装置及びその製造方法 |
JP2003178977A (ja) * | 2001-12-12 | 2003-06-27 | Matsushita Electric Ind Co Ltd | 半導体結晶及びその製造方法 |
JP2004146472A (ja) * | 2002-10-22 | 2004-05-20 | Sharp Corp | 半導体装置及び半導体装置製造方法 |
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CN102867852A (zh) * | 2011-07-04 | 2013-01-09 | 中国科学院微电子研究所 | 晶体管及晶体管的形成方法 |
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