JP2021031766A - 薄膜形成用成長抑制剤、これを利用した薄膜形成方法及びこれから製造された半導体基板 - Google Patents
薄膜形成用成長抑制剤、これを利用した薄膜形成方法及びこれから製造された半導体基板 Download PDFInfo
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- JP2021031766A JP2021031766A JP2020002360A JP2020002360A JP2021031766A JP 2021031766 A JP2021031766 A JP 2021031766A JP 2020002360 A JP2020002360 A JP 2020002360A JP 2020002360 A JP2020002360 A JP 2020002360A JP 2021031766 A JP2021031766 A JP 2021031766A
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- thin film
- growth inhibitor
- film formation
- forming method
- film forming
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- 239000010409 thin film Substances 0.000 title claims abstract description 244
- 238000000034 method Methods 0.000 title claims abstract description 81
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 63
- 239000000758 substrate Substances 0.000 title claims abstract description 57
- 239000004065 semiconductor Substances 0.000 title claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 41
- 239000000126 substance Substances 0.000 claims abstract description 23
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 11
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- 239000010703 silicon Substances 0.000 claims abstract description 8
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- 239000001257 hydrogen Substances 0.000 claims abstract description 7
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 6
- 238000000231 atomic layer deposition Methods 0.000 claims description 50
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- 238000010926 purge Methods 0.000 claims description 17
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- 239000007788 liquid Substances 0.000 claims description 11
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 6
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- 238000001004 secondary ion mass spectrometry Methods 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
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- 150000001923 cyclic compounds Chemical class 0.000 claims description 2
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- 125000005843 halogen group Chemical group 0.000 claims 2
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- 229910017052 cobalt Inorganic materials 0.000 description 3
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- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
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- 239000011229 interlayer Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- KPZGRMZPZLOPBS-UHFFFAOYSA-N 1,3-dichloro-2,2-bis(chloromethyl)propane Chemical compound ClCC(CCl)(CCl)CCl KPZGRMZPZLOPBS-UHFFFAOYSA-N 0.000 description 1
- YHRUOJUYPBUZOS-UHFFFAOYSA-N 1,3-dichloropropane Chemical compound ClCCCCl YHRUOJUYPBUZOS-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- VFWCMGCRMGJXDK-UHFFFAOYSA-N 1-chlorobutane Chemical compound CCCCCl VFWCMGCRMGJXDK-UHFFFAOYSA-N 0.000 description 1
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- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- BSPCSKHALVHRSR-UHFFFAOYSA-N 2-chlorobutane Chemical compound CCC(C)Cl BSPCSKHALVHRSR-UHFFFAOYSA-N 0.000 description 1
- NFRKUDYZEVQXTE-UHFFFAOYSA-N 2-chloropentane Chemical compound CCCC(C)Cl NFRKUDYZEVQXTE-UHFFFAOYSA-N 0.000 description 1
- CXQSCYIVCSCSES-UHFFFAOYSA-N 3-chloropentane Chemical compound CCC(Cl)CC CXQSCYIVCSCSES-UHFFFAOYSA-N 0.000 description 1
- XZRYRASMCKCEPO-UHFFFAOYSA-N C(C)(C)C(N[Ge]CC)(C(C)C)C(C)C Chemical compound C(C)(C)C(N[Ge]CC)(C(C)C)C(C)C XZRYRASMCKCEPO-UHFFFAOYSA-N 0.000 description 1
- OVSHQDISEQBLSB-UHFFFAOYSA-N C[Sn](C)(C)C.C[Sn](C)(C)C Chemical compound C[Sn](C)(C)C.C[Sn](C)(C)C OVSHQDISEQBLSB-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical group O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910052767 actinium Inorganic materials 0.000 description 1
- QQINRWTZWGJFDB-UHFFFAOYSA-N actinium atom Chemical compound [Ac] QQINRWTZWGJFDB-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 150000001728 carbonyl compounds Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- STHAQIJXOMGURG-UHFFFAOYSA-N cyclopenta-1,3-diene;dimethylazanide;zirconium(4+) Chemical compound [Zr+4].C[N-]C.C[N-]C.C[N-]C.C=1C=C[CH-]C=1 STHAQIJXOMGURG-UHFFFAOYSA-N 0.000 description 1
- 125000000058 cyclopentadienyl group Chemical group C1(=CC=CC1)* 0.000 description 1
- 125000004989 dicarbonyl group Chemical group 0.000 description 1
- MQIKJSYMMJWAMP-UHFFFAOYSA-N dicobalt octacarbonyl Chemical group [Co+2].[Co+2].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-] MQIKJSYMMJWAMP-UHFFFAOYSA-N 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
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- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- ZSWFCLXCOIISFI-UHFFFAOYSA-N endo-cyclopentadiene Natural products C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
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- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 229910052740 iodine Inorganic materials 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- QTBFPMKWQKYFLR-UHFFFAOYSA-N isobutyl chloride Chemical compound CC(C)CCl QTBFPMKWQKYFLR-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- ULYZAYCEDJDHCC-UHFFFAOYSA-N isopropyl chloride Chemical compound CC(C)Cl ULYZAYCEDJDHCC-UHFFFAOYSA-N 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 229910052914 metal silicate Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- JKUUTODNPMRHHZ-UHFFFAOYSA-N n-methyl-n-[tris(dimethylamino)germyl]methanamine Chemical compound CN(C)[Ge](N(C)C)(N(C)C)N(C)C JKUUTODNPMRHHZ-UHFFFAOYSA-N 0.000 description 1
- SNMVRZFUUCLYTO-UHFFFAOYSA-N n-propyl chloride Chemical compound CCCCl SNMVRZFUUCLYTO-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000003586 protic polar solvent Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- IEXRMSFAVATTJX-UHFFFAOYSA-N tetrachlorogermane Chemical compound Cl[Ge](Cl)(Cl)Cl IEXRMSFAVATTJX-UHFFFAOYSA-N 0.000 description 1
- GXMNGLIMQIPFEB-UHFFFAOYSA-N tetraethoxygermane Chemical compound CCO[Ge](OCC)(OCC)OCC GXMNGLIMQIPFEB-UHFFFAOYSA-N 0.000 description 1
- 238000000427 thin-film deposition Methods 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- 150000003608 titanium Chemical class 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- ZVWKZXLXHLZXLS-UHFFFAOYSA-N zirconium nitride Chemical compound [Zr]#N ZVWKZXLXHLZXLS-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
-
- 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]
-
- 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
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Abstract
Description
[化1]
AnBmXo
(前記Aは炭素またはケイ素であり、前記Bは水素または炭素数1ないし3のアルキルであり、前記Xはハロゲンであり、前記nは1ないし15の整数であり、前記oは1以上の整数であり、mは0ないし2n+1である。)で表される化合物である薄膜形成用成長抑制剤を提供する。
[化1]
AnBmXo
(前記Aは炭素またはケイ素であり、前記Bは水素または炭素数1ないし3のアルキルであり、前記Xはハロゲンであり、前記nは1ないし15の整数であり、前記oは1以上の整数であり、mは0ないし2n+1である。)で表される化合物であることを特徴とし、このような場合、薄膜形成時に副反応を抑制して薄膜成長率を下げ、また薄膜内工程副生成物を除去することで腐食や劣化が低減され、複雑な構造を持つ基板上に薄膜を形成する場合でも段差被覆性(step coverage)及び薄膜の厚さ均一性を大きく向上させる効果がある。
[化1]
AnBmXo
(前記Aは炭素またはケイ素であり、前記Bは水素または炭素数1ないし3のアルキルであり、前記Xはハロゲンであり、前記nは1ないし15の整数であり、前記oは1以上の整数であり、mは0ないし2n+1である。)で表される薄膜形成用成長抑制剤を、
ALDチャンバ内に投入して、ローディング(loading)された基板の表面に吸着させる段階を含むことを特徴とするのであり、
このような場合、副反応を抑制し、蒸着速度を遅らせて薄膜成長率を下げ、また薄膜内の工程副生成物を除去することで、複雑な構造を持つ基板上に薄膜を形成する場合でも、段差被覆性(step coverage)及び薄膜の厚さ均一性を大きく向上させるという効果がある。
Si(MeNCHCHNMe)2、Si(EtNCHCHNEt)2、Si(nPrNCHCHNnPr)2、Si(iPrNCHCHNiPr)2、Si(nBuNCHCHNnBu)2、Si(iBuNCHCHNiBu)2、Si(tBuNCHCHNtBu)2、(HNCHCHNH)Si(HNCH2CH2NH)、(MeNCHCHNMe)Si(MeNCH2CH2NMe)、(EtNCHCHNEt)Si(EtNCH2CH2NEt)、(nPrNCHCHNnPr)Si(nPrNCH2CH2NnPr)、(iPrNCHCHNiPr)Si(iPrNCH2CH2NiPr)、(nBuNCHCHNnBu)Si(nBuNCH2CH2NnBu)、(iBuNCHCHNiBu)Si(iBuNCH2CH2NiBu)、(tBuNCHCHNtBu)Si(tBuNCH2CH2NtBu)、(NHtBu)2Si(HNCH2CH2NH)、(NHtBu)2Si(MeNCH2CH2NMe)、(NHtBu)2Si(EtNCH2CH2NEt)、(NHtBu)2Si(nPrNCH2CH2NnPr)、(NHtBu)2Si(iPrNCH2CH2NiPr)、(NHtBu)2Si(nBuNCH2CH2NnBu)、(NHtBu)2Si(iBuNCH2CH2NiBu)、(NHtBu)2Si(tBuNCH2CH2NtBu)、(NHtBu)2Si(HNCHCHNH)、(NHtBu)2Si(MeNCHCHNMe)、(NHtBu)2Si(EtNCHCHNEt)、(NHtBu)2Si(nPrNCHCHNnPr)、(NHtBu)2Si(iPrNCHCHNiPr)、(NHtBu)2Si(nBuNCHCHNnBu)、(NHtBu)2Si(iBuNCHCHNiBu)、(NHtBu)2Si(tBuNCHCHNtBu)、(iPrNCH2CH2NiPr)Si(NHMe)2、(iPrNCH2CH2NiPr)Si(NHEt)2、(iPrNCH2CH2NiPr)Si(NHnPr)2、(iPrNCH2CH2NiPr)Si(NHiPr)2、(iPrNCH2CH2NiPr)Si(NHnBu)2、(iPrNCH2CH2NiPr)Si(NHiBu)2、(iPrNCH2CH2NiPr)Si(NHtBu)2、(iPrNCHCHNiPr)Si(NHMe)2、(iPrNCHCHNiPr)Si(NHEt)2、(iPrNCHCHNiPr)Si(NHnPr)2、(iPrNCHCHNiPr)Si(NHiPr)2、(iPrNCHCHNiPr)Si(NHnBu)2、(iPrNCHCHNiPr)Si(NHiBu)2及び(iPrNCHCHNiPr)Si(NHtBu)2からなる群から選択された1種以上でもよいが、これに制限されるものではない。
サイクルあたりの薄膜成長率の減少率(%)=
[(薄膜形成用成長抑制剤を使用した時のサイクルあたりの薄膜成長率
−薄膜形成用成長抑制剤を使用しなかった時のサイクルあたりの薄膜成長率)
/薄膜形成用成長抑制剤を使用しなかった時のサイクルあたりの薄膜成長率]×100
まず、上部に薄膜が形成され得る基板を原子層蒸着が可能な蒸着チャンバ内に位置させる。
<実施例1ないし7>
下記表1に記載された薄膜形成用成長抑制剤と、薄膜前駆体化合物としてのTiCl4とをそれぞれ準備した。準備した薄膜形成用成長抑制剤(SP)を、キャニスター(canister)に入れて、常温でLMFC(Liquid Mass Flow Controller)を利用して、0.05g/min(0.83mg/sec)の流速で、150℃に加熱された気化器に供給した。気化器にて気相へと気化された薄膜形成用成長抑制剤を、3秒間、基板がローディングされた蒸着チャンバに投入した。この後、アルゴンガスを3000sccmで6秒間供給して、アルゴンパージングを実施した。これらの処理の際、反応チャンバ内の圧力は1.3Torrに制御して維持した。
実施例1の方法にて薄膜形成用成長抑制剤を使用しなかったことと、これに伴い非吸着薄膜形成用成長抑制剤をパージする段階を省略したことを除き、実施例1と同一の方法で、基板上にTINの薄膜を形成した。
実施例1の方法にて上記表1に記載された薄膜形成用成長抑制剤ではなく、ペンタン(Pentane)またはシクロペンタン(Cyclopentane)を使用したことを除き、実施例1と同一の方法で、基板上にTINの薄膜を形成した。
1)蒸着の評価
下記表2に示したように、2−chloro−2−methylbutaneを薄膜形成用成長抑制剤として使用した実施例1と、これを含んでいない比較例1とを比較した。その結果、蒸着速度は0.20Å/cycleであり、比較例1と比較した場合に55.5%以上、蒸着速度が減少した。残りの実施例2ないし7も、実施例1と類似する値の蒸着速度であることを確認することができた。また、本発明に係る薄膜形成用成長抑制剤の代わりにペンタンまたはシクロペンタンを使用した比較例2及び3も、比較例1と同一の値の蒸着速度であることを確認することができた。ここで、蒸着速度の減少は、CVD蒸着特性をALD蒸着特性に変化させることを意味するため、段差被覆特性の改善の指標として活用することができる。
実施例1及び比較例1にて蒸着されたTiN薄膜についての不純物低減特性、即ち、工程における副生成物低減の特性を比較するために、SIMS分析を行い、その結果を以下の表4に示した。
実施例1及び比較例1で蒸着されたTiN薄膜について、TEMを利用して段差被覆率を確認し、その結果を下記表5及び図5に示した。
前記実施例1で膜前駆体としてTiCl4の代わりにトリス(ジメチルアミノ)シクロペンタジエニルジルコニウム(Tris(dimethylamino)cyclopentadienyl zirconium;CpZr)を使用し、薄膜形成用成長抑制剤のチャンバ内への投入速度を12mg/secにし、反応ガスとしてアンモニアの代わりにオゾンを使用し、金属薄膜が形成される基板を280ないし340℃に加熱したことを除き、前記実施例1と同一の方法で成膜工程を行い、ジルコニウム酸化膜(ZrO2薄膜)を形成した。
前記追加実施例1で薄膜形成用成長抑制剤のチャンバ内への投入速度を2.3mg/secにして、それぞれ、1ないし7秒間投入したことと、金属薄膜が形成される基板を310℃に加熱したことを除き、前記追加実施例1と同一の方法で成膜工程を行い、ジルコニウム酸化膜(ZrO2薄膜)を形成した。
前記追加実施例1で薄膜形成用成長抑制剤を使用していないことを除き、前記追加実施例1と同一の方法で成膜工程を行い、ジルコニウム酸化膜(ZrO2薄膜)を形成した。
厚さ均一度(%)=[(MAX−MIN)/(2×AVERAGE)]×100%
Claims (15)
- 下記化学式1
[化1]
AnBmXo
(前記Aは炭素またはケイ素であり、前記Bは水素または炭素数1ないし3のアルキルであり、前記Xはハロゲンであり、前記nは1ないし15の整数であり、前記oは1以上の整数であり、mは0ないし2n+1である。)で表される化合物であることを特徴とする、
薄膜形成用成長抑制剤。 - 前記化学式1でXは塩素(Cl)であることを特徴とする、
請求項1に記載の薄膜形成用成長抑制剤。 - 前記化学式1で前記oは1ないし5の整数であることを特徴とする、
請求項1または2に記載の薄膜形成用成長抑制剤。 - 前記化学式1で表される化合物は分枝状、環状または芳香族の化合物であることを特徴とする、
請求項1〜3のいずれかに記載の薄膜形成用成長抑制剤。 - 前記化学式1で表される化合物は、原子層堆積(ALD)工程に使用されることを特徴とする、
請求項1〜4のいずれかに記載の薄膜形成用成長抑制剤。 - 前記化学式1で表される化合物は常温(22℃)で液体であり、密度が0.8ないし1.5g/cm3であり、蒸気圧(20℃)が1ないし300mmHgであり、水に対する溶解度(25℃)が200mg/L以下であることを特徴とする、
請求項1〜5のいずれかに記載の薄膜形成用成長抑制剤。 - 下記化学式1
[化1]
AnBmXo
(前記Aは炭素またはケイ素であり、前記Bは水素または炭素数1ないし3のアルキルであり、前記Xはハロゲンであり、前記nは1ないし15の整数であり、前記oは1以上の整数であり、mは0ないし2n+1である。)で表される薄膜形成用成長抑制剤をALDチャンバ内に投入してローディング(loading)された基板の表面に吸着させる段階を含むことを特徴とする、
薄膜形成方法。 - i)前記薄膜形成用成長抑制剤を気化してALDチャンバ内のローディングされた基板表面に吸着させる段階と、
ii)前記ALDチャンバ内部をパージガスで1次パージングする段階と、
iii)薄膜前駆体化合物を気化してALDチャンバ内のローディングされた基板表面に吸着させる段階と、
iv)前記ALDチャンバ内部をパージガスで2次パージングする段階と、
v)前記ALDチャンバ内部に反応ガスを供給する段階、及び
vi)前記ALDチャンバ内部をパージガスで3次パージングする段階を含むことを特徴とする、
請求項7に記載の薄膜形成方法。 - 前記薄膜形成用成長抑制剤及び薄膜前駆体化合物はVFC方式、DLI方式またはLDS方式でALDチャンバ内に移送されることを特徴とする、
請求項8に記載の薄膜形成方法。 - 前記薄膜形成用成長抑制剤と前記前駆体化合物のALDチャンバ内投入量(mg/cycle)比は1:1.5ないし1:20であることを特徴とする、
請求項8または9に記載の薄膜形成方法。 - 前記薄膜形成方法は、下記数式1で計算される、サイクルあたりの薄膜成長率(Å/Cycle)の減少率が−5%以下であることを特徴とする、
請求項8〜10のいずれかに記載の薄膜形成方法。
[数1]
サイクルあたりの薄膜成長率の減少率(%)=
[(薄膜形成用成長抑制剤を使用した時のサイクルあたりの薄膜成長率
−薄膜形成用成長抑制剤を使用しなかった時のサイクルあたりの薄膜成長率)
/薄膜形成用成長抑制剤を使用しなかった時のサイクルあたりの薄膜成長率]×100 - 前記薄膜形成方法はSIMS(二次イオン質量分析)によって測定された、200サイクル後に形成された薄膜内の残留ハロゲンの強度(counts/sec)が10,000以下であることを特徴とする、
請求項8〜11のいずれかに記載の薄膜形成方法。 - 前記反応ガスは還元剤、窒化剤または酸化剤であることを特徴とする、
請求項8〜12のいずれかに記載の薄膜形成方法。 - 請求項7〜13のいずれかによる薄膜形成方法で製造されることを特徴とする、
半導体基板。 - 前記製造された薄膜は厚さが20nm以下であり、比抵抗値が0.1ないし400μΩcmであり、ハロゲン含量が10,000ppm以下であり、段差被覆率が80%以上であることを特徴とする、
請求項14に記載の半導体基板。
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