JP2020530881A - 3次元垂直nandワード線用の金属充填プロセス - Google Patents
3次元垂直nandワード線用の金属充填プロセス Download PDFInfo
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- JP2020530881A JP2020530881A JP2020508312A JP2020508312A JP2020530881A JP 2020530881 A JP2020530881 A JP 2020530881A JP 2020508312 A JP2020508312 A JP 2020508312A JP 2020508312 A JP2020508312 A JP 2020508312A JP 2020530881 A JP2020530881 A JP 2020530881A
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- Prior art keywords
- tungsten
- diborane
- hydrogen
- semiconductor substrate
- deposition
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 36
- 239000002184 metal Substances 0.000 title claims abstract description 36
- 238000005429 filling process Methods 0.000 title description 9
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 200
- 239000010937 tungsten Substances 0.000 claims abstract description 200
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 199
- 238000000034 method Methods 0.000 claims abstract description 142
- 239000000758 substrate Substances 0.000 claims abstract description 114
- 239000007789 gas Substances 0.000 claims abstract description 102
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910052796 boron Inorganic materials 0.000 claims abstract description 88
- 239000002243 precursor Substances 0.000 claims abstract description 73
- 239000004065 semiconductor Substances 0.000 claims abstract description 67
- 239000001257 hydrogen Substances 0.000 claims abstract description 47
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 43
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 31
- 150000003624 transition metals Chemical class 0.000 claims abstract description 31
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 9
- 230000008021 deposition Effects 0.000 claims description 104
- 230000008569 process Effects 0.000 claims description 88
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 23
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 15
- 229910000077 silane Inorganic materials 0.000 claims description 15
- 239000010941 cobalt Substances 0.000 claims description 8
- 229910017052 cobalt Inorganic materials 0.000 claims description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 8
- ZOCHARZZJNPSEU-UHFFFAOYSA-N diboron Chemical compound B#B ZOCHARZZJNPSEU-UHFFFAOYSA-N 0.000 claims description 8
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 6
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052707 ruthenium Inorganic materials 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- NXHILIPIEUBEPD-UHFFFAOYSA-H tungsten hexafluoride Chemical compound F[W](F)(F)(F)(F)F NXHILIPIEUBEPD-UHFFFAOYSA-H 0.000 claims description 4
- FQNHWXHRAUXLFU-UHFFFAOYSA-N carbon monoxide;tungsten Chemical group [W].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-] FQNHWXHRAUXLFU-UHFFFAOYSA-N 0.000 claims description 3
- KPGXUAIFQMJJFB-UHFFFAOYSA-H tungsten hexachloride Chemical compound Cl[W](Cl)(Cl)(Cl)(Cl)Cl KPGXUAIFQMJJFB-UHFFFAOYSA-H 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 1
- 238000000151 deposition Methods 0.000 abstract description 110
- 239000003638 chemical reducing agent Substances 0.000 abstract description 30
- 230000006870 function Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 100
- 238000011049 filling Methods 0.000 description 53
- 230000006911 nucleation Effects 0.000 description 44
- 238000010899 nucleation Methods 0.000 description 44
- 239000000463 material Substances 0.000 description 43
- 238000007654 immersion Methods 0.000 description 26
- 238000005229 chemical vapour deposition Methods 0.000 description 25
- 235000012431 wafers Nutrition 0.000 description 24
- 239000000376 reactant Substances 0.000 description 19
- 239000003153 chemical reaction reagent Substances 0.000 description 15
- 238000005530 etching Methods 0.000 description 15
- 238000010926 purge Methods 0.000 description 15
- 238000000231 atomic layer deposition Methods 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- 238000012545 processing Methods 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 9
- UORVGPXVDQYIDP-UHFFFAOYSA-N borane Chemical class B UORVGPXVDQYIDP-UHFFFAOYSA-N 0.000 description 9
- 229910000085 borane Inorganic materials 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000001465 metallisation Methods 0.000 description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- 238000005240 physical vapour deposition Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 239000011800 void material Substances 0.000 description 5
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000005137 deposition process Methods 0.000 description 3
- 229910052732 germanium Inorganic materials 0.000 description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical group 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000000059 patterning Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 229920005591 polysilicon Polymers 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- DOYIBAKSKZZYPC-UHFFFAOYSA-N cyclopenta-1,3-diene;nickel(2+);prop-1-ene Chemical compound [Ni+2].[CH2-]C=C.C=1C=C[CH-]C=1 DOYIBAKSKZZYPC-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012625 in-situ measurement Methods 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MNWRORMXBIWXCI-UHFFFAOYSA-N tetrakis(dimethylamido)titanium Chemical compound CN(C)[Ti](N(C)C)(N(C)C)N(C)C MNWRORMXBIWXCI-UHFFFAOYSA-N 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- -1 tungsten nitride Chemical class 0.000 description 2
- RLJUCKFARAQBDA-UHFFFAOYSA-N C(C)C1(C=CC=C1)[W](N=O)(=C=O)=C=O Chemical compound C(C)C1(C=CC=C1)[W](N=O)(=C=O)=C=O RLJUCKFARAQBDA-UHFFFAOYSA-N 0.000 description 1
- OAMOJYZDVHZSDW-UHFFFAOYSA-N CC1(C=CC=C1)[W](N=O)(=C=O)=C=O Chemical compound CC1(C=CC=C1)[W](N=O)(=C=O)=C=O OAMOJYZDVHZSDW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910004529 TaF 5 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- IVHJCRXBQPGLOV-UHFFFAOYSA-N azanylidynetungsten Chemical compound [W]#N IVHJCRXBQPGLOV-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007806 chemical reaction intermediate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- VSLPMIMVDUOYFW-UHFFFAOYSA-N dimethylazanide;tantalum(5+) Chemical compound [Ta+5].C[N-]C.C[N-]C.C[N-]C.C[N-]C.C[N-]C VSLPMIMVDUOYFW-UHFFFAOYSA-N 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical group 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- MGRWKWACZDFZJT-UHFFFAOYSA-N molybdenum tungsten Chemical compound [Mo].[W] MGRWKWACZDFZJT-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000000678 plasma activation Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical group [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
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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
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
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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
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28568—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table the conductive layers comprising transition metals
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
- C23C16/08—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material from metal halides
- C23C16/14—Deposition of only one other metal element
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
- C23C16/16—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material from metal carbonyl compounds
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45553—Atomic layer deposition [ALD] characterized by the use of precursors specially adapted for ALD
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- H—ELECTRICITY
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Abstract
Description
本出願は、2017年8月14日に出願され、「METAL FILL PROCESS FOR THREE−DIMENSIONAL VERTICAL NAND WORDLINE」と題する米国仮特許出願第62/545,405号の優先権の利益を主張し、その全体があらゆる目的で本明細書に参照として組み込まれる。
ガス混合物を、ガス供給ラインから堆積チャンバの中に、そして半導体基板の表面に導入することであって、ジボランは分解して、水平に向いたフィーチャ内にホウ素層が形成される、ことと、半導体基板においてホウ素層を遷移金属層に変換することと、を実施する。
集積回路(IC)設計および作製においてタングステン材料が頻繁に使用されているにもかかわらず、その使用に関連した難しさがある。例えば、タングステン材料を、小さなフィーチャまたは高アスペクト比を有するフィーチャの中に堆積させると、堆積されたタングステン内にボイドが形成される場合がある。ボイドとは、単に、構造またはフィーチャ内において、周囲の領域が充填された後に充填されずに残った領域である。多くの場合、ボイド形成は、フィーチャの入口付近に堆積された材料が不均衡に蓄積されることによって生じ、その結果、入口が閉塞され、フィーチャの内部容積がピンチオフされて、内部容積内での更なる堆積が防止される。いったん閉塞またはピンチオフされると、反応性堆積前駆体種は内部容積の中への進入経路を持たず、これら領域内でのいかなる更なる堆積も妨げられる。他の場合、たとえピンチオフがなくても、タングステン材料は(ボトムアップでの充填を示すのではなく)側壁から外向きに堆積する傾向があるので、堆積したタングステン材料に継ぎ目が現れる場合がある。従って、そのような継ぎ目は典型的には、フィーチャの中心軸のかなりの部分に沿って細長く、フィーチャの底部に向かって延びる。充填プロセスの完了後に継ぎ目がフィールド領域の近くまで広がっていて、その後の化学的機械的平坦化によって継ぎ目が開く場合など、継ぎ目の存在がボイドの形成につながる場合が時々ある。いずれにせよ、継ぎ目およびボイドは、高抵抗、基板汚染、材料の喪失などを引き起こし、別途、集積回路の電気特性に悪影響を与える場合がある。
いくつかの実現形態では、タングステン堆積は、コンフォーマルなホウ素堆積と、それに続くホウ素によるタングステン含有前駆体(WF6など)の還元によるタングステンの層を形成することを含むことができる。反応の例は次の通りである:WF6(g)+2B(s)→W(s)+BF3(g)。ホウ素変換によるタングステンの堆積は、タングステン核形成層の形成、またはフィーチャのタングステンでの充填において生じ得る。ホウ素変換によるフィーチャ充填の例を図4に示す。しかし、ホウ素変換は、フィーチャ充填のためにタングステンを堆積するだけでなく、核形成層および他の目的としてタングステンを堆積することにも役立ち得ると理解されている。
いくつかの実現形態では、本明細書に記載される方法は、バルク層の堆積の前にタングステン核形成層を堆積することを伴う。核形成層は、典型的には、薄いコンフォーマル層であり、その層が、その層上へのバルクタングステン含有材料のその後の堆積を促進する。様々な実現形態によると、核形成層は、フィーチャのあらゆる充填の前に、および/またはフィーチャの充填中の以降の時点で堆積されてよい。例えば、いくつかの実現形態では、フィーチャ内のタングステンのエッチングに続いて核形成層が堆積されてよい。
多くの実現形態では、タングステンバルク堆積は、還元剤およびタングステン含有前駆体を堆積チャンバの中に流してフィーチャ内にバルク充填層を堆積するCVDプロセスによって生じ得る。不活性キャリアガスを使用して、予混合されている場合も、予混合されていない場合もある反応物ストリームのうちの1つ以上を送達してよい。PNLまたはALDプロセスとは異なり、この作業は一般に、所望の量が堆積されるまで反応物を連続的に流すことを伴う。特定の実現形態では、CVD作業は複数段階で行われてよく、複数段階は、連続的かつ同時の反応物の流れからなる複数の期間が、1つ以上の反応物の流れを迂回させた期間によって分離される。
前述のように、3D VNAND構造の水平ワード線フィーチャ内にタングステンを均一に堆積させることが、大きな困難を生じさせる場合がある。3D VNAND構造のアスペクト比が大きくなり、水平ワード線のスタックが多くなるにつれて、前駆体ガスは、均一なタングステン堆積が望まれる領域へと、より長い距離を、かつより狭い経路を移動する必要があり得る。3D VNAND構造におけるタングステンの均一な堆積に関連する困難さを、図1A〜図1D、図2A〜図2B、および図3A〜図3Cに関連して議論する。
(1)B2H6←→2BH3
(2)B2H6+BH3←→B3H9
(3)B3H9←→B3H7+H2(律速段階)
(4)BH3+B3H7←→B4H10
(5)B2H6+B3H7←→B5H11+H2
ガス混合物中のジボランに水素を添加すると、ジボランの熱分解が遅くなる場合がある。従って、水素でバランスされたジボランは、ジボランの分解を安定化させる。ジボランは、貯蔵、送達、および基板表面上に吸着された場合、分解が遅くなる場合がある。
本明細書で提示される方法は、様々な供給メーカから入手可能な様々な装置で実施され得る。好適であり得る装置の例には、Novellus Concept−1(商標)ALTUS(商標)、Concept−2 ALTUS(商標)、Concept−2 ALTUS−S(商標)、Concept−3 ALTUS(商標)、およびALTUS Max(商標)堆積システム、または任意の様々な他の市販の化学気相堆積(CVD)ツールが含まれる。図8は、特定の実施形態に従って部分的に作製された半導体基板を処理するための装置800の概略図を示す。装置800は、台座820を有するチャンバ818、シャワーヘッド814、インサイチュプラズマ発生器816、および遠隔プラズマ発生器806を含む。台座820は、半導体基板828を支持するように構成されている。装置800はまた、入力を受信し、および/または制御信号を様々なデバイスに伝達するためのシステムコントローラ822を含む。
ガス混合物を、ガス供給ラインから堆積チャンバの中に、そして半導体基板の表面へと導入することであって、ガス混合物は水素でバランスされたジボランを含み、半導体基板は、複数の水平に向いたフィーチャを有する垂直構造体を含み、ジボランは分解して、水平に向いたフィーチャ内にホウ素層が形成される、こと;
および、半導体基板においてホウ素層を遷移金属層に変換すること。いくつかの実現形態では、ホウ素層を変換することは、ホウ素層を遷移金属前駆体に曝露させることを含む。
本明細書で上述した装置/プロセスは、例えば、半導体デバイス、ディスプレイ、LED、光起電力パネルなどの作製または製造のために、リソグラフィパターニング用のツールまたはプロセスと共に使用されてよい。典型的には、しかし必ずしもそうではないが、そのようなツール/プロセスは、共通の製造施設で共に使用されるか、または実行されることになる。膜のリソグラフィパターニングは典型的には、以下の作業の一部または全てを含み、各作業は複数の実行可能なツールによって可能になる:
(1)スピンオンツールまたはスプレーオンツールを用いて、ワークピース、すなわち基板上にフォトレジストを塗布すること;
(2)ホットプレート、加熱炉、または、UV硬化ツールを用いてフォトレジストを硬化させること;
(3)ウェハステッパなどのツールを用いてフォトレジストを可視光、UV光、またはX線に曝露させること;
(4)ウェットベンチなどのツールを使用して、レジストを現像し、それによりレジストを選択的に除去してパターニングすること;
(5)ドライエッチングツールまたはプラズマ援用エッチングツールを用いることによってレジストパターンを下地の膜またはワークピースに転写すること;
および(6)RFまたはマイクロ波によるプラズマレジスト剥離装置などのツールを用いてレジストを除去すること。
前述の開示されたプロセス、方法、システム、装置、および構成物は、明確さおよび理解を促進する目的で、特定の実施形態との関連において詳細に記載してきたが、本開示の趣旨内にあるこれらプロセス、方法、システム、装置、および構成物を実現する多くの代替方法があることが当業者には明らかであろう。従って、本明細書に記載された実施形態は、開示された発明概念の例示と見なすべきであって、限定的と見なすべきではなく、本開示の主題に最終的に向けられる任意の請求項の範囲を不必要に限定する、容認できない根拠として使用されるべきではない。
Claims (20)
- 方法であって、
ガス供給ラインでガス混合物を供給することであって、前記ガス混合物は水素(H2)でバランスされたジボラン(B2H6)を含む、ことと、
前記ガス混合物を、前記ガス供給ラインから堆積チャンバの中に、そして半導体基板の表面に導入することであって、前記半導体基板は、複数の水平に向いたフィーチャを有する垂直構造体を含み、前記ジボランは分解して、前記水平に向いたフィーチャ内にホウ素層を形成する、ことと、
前記半導体基板において前記ホウ素層を遷移金属層に変換することと、含む方法。 - 請求項1に記載の方法であって、前記ガス混合物は、水素でバランスされた少なくとも20体積%のジボランを含む、方法。
- 請求項2に記載の方法であって、前記ガス混合物は、水素でバランスされた約20体積%〜約50体積%のジボランを含む、方法。
- 請求項1に記載の方法であって、前記遷移金属層は、モリブデン、ルテニウム、コバルト、またはタングステンを含む、方法。
- 請求項1に記載の方法であって、前記ホウ素層を前記遷移金属層に変換することは、前記ホウ素層をタングステン含有前駆体と反応させてタングステン層を形成することを含む、方法。
- 請求項5に記載の方法であって、前記タングステン含有前駆体は、六フッ化タングステン(WF6)、六塩化タングステン(WCl6)、またはタングステンヘキサカルボニル(W(CO)6)を含む、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、前記ガス混合物は実質的に窒素(N2)を含まない、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、前記半導体基板は、前記垂直構造体の側壁に開口部を有し、前記開口部を通して前記垂直構造体から流体的にアクセス可能である、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、前記垂直構造体は3次元(3D)垂直NAND構造である、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、前記ホウ素層は、前記垂直構造体の前記水平に向いたフィーチャ内にコンフォーマルに堆積され、前記ホウ素層は少なくとも90%のステップカバレッジを有する、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、前記ガス混合物を導入することは、パルス核形成層(PNL)堆積サイクルで約0.1秒〜約10秒の一定時間にわたって、水素でバランスされた前記ジボランをパルスすることを含む、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、前記ガス混合物を導入することは、約1秒〜約60秒の一定時間にわたって、水素でバランスされた前記ジボランをパルスすることを含む、方法。
- 請求項1〜6のいずれか一項に記載の方法であって、
前記半導体基板を還元ガスに曝露させることを更に含み、前記還元ガスは、シラン、ジシラン、または水素を含む、方法。 - 装置であって、
水素でバランスされたジボランのガス混合物を含有するガス供給ラインと、
前記ガス供給ラインに結合された堆積チャンバであって、前記堆積チャンバは、前記堆積チャンバ内の半導体基板を処理するように構成され、前記半導体基板は、複数の水平に向いたフィーチャを有する垂直構造体を含む、堆積チャンバと、
命令を伴って構成されているコントローラであって、前記命令は以下の作業:
前記ガス混合物を、前記ガス供給ラインから前記堆積チャンバの中に、そして前記半導体基板の表面まで導入することであって、前記ジボランは分解して、前記水平に向いたフィーチャ内でホウ素層を形成する、ことと、
前記半導体基板において前記ホウ素層を遷移金属層に変換することと、
を実施するためのものである、コントローラと、
を含む装置。 - 請求項14に記載の装置であって、前記ガス混合物が、水素でバランスされた少なくとも20体積%のジボランを含む、装置。
- 請求項15に記載の装置であって、前記ガス混合物は、水素でバランスされた約20体積%〜約50体積%のジボランを含む、装置。
- 請求項14に記載の装置であって、前記遷移金属層は、モリブデン、ルテニウム、コバルト、またはタングステンを含む、装置。
- 請求項14〜17のいずれか一項に記載の装置であって、前記ホウ素層を変換する命令を伴って構成されている前記コントローラは、前記ホウ素層を遷移金属前駆体と反応させて前記遷移金属層を形成する命令を伴って構成されている、装置。
- 請求項14〜17のいずれか一項に記載の装置であって、前記半導体基板は、前記垂直構造体の側壁に開口部を有し、前記開口部を通して前記垂直構造体から流体的にアクセス可能である、装置。
- 請求項14〜17のいずれか一項に記載の装置であって、前記コントローラは、前記半導体基板を、シラン、ジシラン、または水素を含む還元ガスに曝露させる作業を実施する命令を伴って更に構成されている、装置。
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SG11202001268TA (en) | 2020-03-30 |
TW201921516A (zh) | 2019-06-01 |
TWI784037B (zh) | 2022-11-21 |
US20200211853A1 (en) | 2020-07-02 |
TWI835366B (zh) | 2024-03-11 |
KR20200032756A (ko) | 2020-03-26 |
TW202322222A (zh) | 2023-06-01 |
CN111095488A (zh) | 2020-05-01 |
WO2019036292A1 (en) | 2019-02-21 |
JP2024038138A (ja) | 2024-03-19 |
US11348795B2 (en) | 2022-05-31 |
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