JP6235581B2 - 成膜装置および方法 - Google Patents
成膜装置および方法 Download PDFInfo
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- JP6235581B2 JP6235581B2 JP2015520778A JP2015520778A JP6235581B2 JP 6235581 B2 JP6235581 B2 JP 6235581B2 JP 2015520778 A JP2015520778 A JP 2015520778A JP 2015520778 A JP2015520778 A JP 2015520778A JP 6235581 B2 JP6235581 B2 JP 6235581B2
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- 238000000034 method Methods 0.000 title claims description 86
- 239000003153 chemical reaction reagent Substances 0.000 claims description 323
- 239000000758 substrate Substances 0.000 claims description 186
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 145
- 239000010408 film Substances 0.000 claims description 141
- 230000008021 deposition Effects 0.000 claims description 110
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 86
- 229910021529 ammonia Inorganic materials 0.000 claims description 71
- 125000002524 organometallic group Chemical group 0.000 claims description 71
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 70
- 229910052799 carbon Inorganic materials 0.000 claims description 70
- 239000012535 impurity Substances 0.000 claims description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 46
- 239000001301 oxygen Substances 0.000 claims description 46
- 229910052760 oxygen Inorganic materials 0.000 claims description 46
- 229910052757 nitrogen Inorganic materials 0.000 claims description 43
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 20
- 239000010409 thin film Substances 0.000 claims description 17
- RGGPNXQUMRMPRA-UHFFFAOYSA-N triethylgallium Chemical compound CC[Ga](CC)CC RGGPNXQUMRMPRA-UHFFFAOYSA-N 0.000 claims description 17
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- DIIIISSCIXVANO-UHFFFAOYSA-N 1,2-Dimethylhydrazine Chemical compound CNNC DIIIISSCIXVANO-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- IBEFSUTVZWZJEL-UHFFFAOYSA-N trimethylindium Chemical compound C[In](C)C IBEFSUTVZWZJEL-UHFFFAOYSA-N 0.000 claims description 4
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 2
- 210000002381 plasma Anatomy 0.000 description 184
- 238000000151 deposition Methods 0.000 description 92
- 125000004429 atom Chemical group 0.000 description 33
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 21
- 229910002601 GaN Inorganic materials 0.000 description 20
- 238000013461 design Methods 0.000 description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 18
- 238000013459 approach Methods 0.000 description 16
- 238000000231 atomic layer deposition Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 14
- 238000005229 chemical vapour deposition Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000010348 incorporation Methods 0.000 description 11
- 239000012528 membrane Substances 0.000 description 10
- 230000002829 reductive effect Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- 230000036961 partial effect Effects 0.000 description 9
- 230000004888 barrier function Effects 0.000 description 8
- 150000004767 nitrides Chemical class 0.000 description 8
- 230000009467 reduction Effects 0.000 description 8
- 239000002699 waste material Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 6
- -1 methyl radicals Chemical class 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000002441 reversible effect Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000011109 contamination Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000010926 purge Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 230000037361 pathway Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 229910052733 gallium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- WCYWZMWISLQXQU-UHFFFAOYSA-N methyl Chemical compound [CH3] WCYWZMWISLQXQU-UHFFFAOYSA-N 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- 238000000663 remote plasma-enhanced chemical vapour deposition Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- HQWPLXHWEZZGKY-UHFFFAOYSA-N diethylzinc Chemical compound CC[Zn]CC HQWPLXHWEZZGKY-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052752 metalloid Inorganic materials 0.000 description 2
- 150000002738 metalloids Chemical class 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- USZGMDQWECZTIQ-UHFFFAOYSA-N [Mg](C1C=CC=C1)C1C=CC=C1 Chemical compound [Mg](C1C=CC=C1)C1C=CC=C1 USZGMDQWECZTIQ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000012707 chemical precursor Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 description 1
- JTGAUXSVQKWNHO-UHFFFAOYSA-N ditert-butylsilicon Chemical compound CC(C)(C)[Si]C(C)(C)C JTGAUXSVQKWNHO-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 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
- C23C16/22—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 inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/301—AIII BV compounds, where A is Al, Ga, In or Tl and B is N, P, As, Sb or Bi
- C23C16/303—Nitrides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3244—Gas supply means
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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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/0632—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with gallium, indium or thallium
-
- 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
- C23C16/448—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 generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/452—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 generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by activating reactive gas streams before their introduction into the reaction chamber, e.g. by ionisation or addition of reactive species
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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
-
- 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]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45536—Use of plasma, radiation or electromagnetic fields
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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]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
- C23C16/45548—Atomic layer deposition [ALD] characterized by the apparatus having arrangements for gas injection at different locations of the reactor for each ALD half-reaction
- C23C16/45551—Atomic layer deposition [ALD] characterized by the apparatus having arrangements for gas injection at different locations of the reactor for each ALD half-reaction for relative movement of the substrate and the gas injectors or half-reaction reactor compartments
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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
- C23C16/50—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 using electric discharges
- C23C16/513—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 using electric discharges using plasma jets
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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
- C23C16/52—Controlling or regulating the coating process
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Description
(a)前記成長チャンバの第1堆積区域に位置して、前記区域に第VA族プラズマを導入する第VA族プラズマ注入口と、
(b)前記成長チャンバの第2堆積区域に位置して、前記区域に第IIIA族試薬を導入する第IIIA族試薬注入口と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、該追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する、第IIIA族試薬注入口に隣接した追加試薬注入口と、
(d)1つ以上の基材を支持し、かつ各基材を第1堆積区域と第2堆積区域との間で回転させるのに適合した基材ホルダとを備える。
好ましくは、第VA族プラズマ注入口、第IIIA族試薬注入口、および追加試薬注入口は、前記1つ以上の基材の成長表面から約1cm〜約30cm、より好ましくは、約1〜約20cm、または1cm〜約10cmの距離を置いて成長チャンバに開口している。
前記追加試薬注入口は、成長チャンバの天井から下方に延びて1つ以上の基材の成長表面に近接して終了し得る。
適切には、第VA族プラズマ注入口と前記1つ以上の基材との間の直接的な流路は、第VA族プラズマを生成するためのプラズマ発生器と前記1つ以上の基材との間の妨げられない経路へ延びている。
好ましくは、第1堆積区域は、第2堆積区域から実質的に隔離されている。
好ましくは、基材ホルダは、それによって該基材ホルダが中心枢軸の回りを回転し、その周囲に基材を保持するのにそれぞれ適合した複数の凹部を備えた回転テーブル設計のものである。
第VA族プラズマ注入口および第IIIA族試薬注入口が成長チャンバ内において中央に位置する場合、前記注入口の一方または双方は、対応するプラズマまたは試薬を適当な第1堆積区域または第2堆積区域に案内するために流量調整装置を備えてもよい。
前記邪魔板は、前記邪魔板の1つ以上の出口を遮断する流れ障壁であり得る流量調整装置を備える。
好ましくは、前記第VA族プラズマは活性窒素種を含有する窒素プラズマである。
1つの特に好ましい実施形態において、前記第VA族プラズマ注入口および第IIIA族試薬注入口は、成長チャンバ内において周辺に位置する。
前記成長チャンバは、1つ以上の基材に接触する直前に前記試薬の混合を促進するために、追加試薬注入口および/または第IIIA族試薬注入口に関連した1つ以上の構造を備え得る。
第2態様において、本発明はRPCVDによって基材上に薄膜を形成する方法に属し、前記方法は、
(a)第VA族プラズマを、第VA族プラズマ注入口を介して成長チャンバの第1堆積区域に導入する工程と、
(b)第IIIA族試薬を、第IIIA族試薬注入口を介して前記成長チャンバの第2堆積区域に導入する工程であって、第2堆積区域は第1堆積区域から実質的に隔離されている工程と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、追加試薬注入口を介して、前記追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する工程と、
(d)前記基材を第1堆積区域と第2堆積区域との間で移動させる工程とを含み、
それにより基材上に薄膜を形成する。
適切には、前記追加試薬は、第IIIA族注入口の開口に実質的に隣接する第2堆積区域に導入される。
一実施形態において、前記追加試薬は、前記基材の成長表面の上を通過し、かつ前記成長表面に実質的に隣接するほぼ水平な流路を形成するように成長チャンバに導入される。
適切には、前記第IIIA族試薬は第IIIA族有機金属試薬である。
好ましくは、前記第IIIA族アルキル金属試薬は、トリメチルガリウム、トリエチルガリウム、トリメチルインジウムおよびトリメチルアルミニウムからなる群より選択される。
前記方法は、前記1つ以上の基材と隣接する有機金属試薬と追加試薬との混合を促進する工程をさらに含み得る。
好ましくは、前記第VA族プラズマは活性窒素種を含有する窒素プラズマである。
前記方法は、関連する注入口を退出する際に第VA族プラズマまたは第IIIA族試薬のうちの1つ以上の流れを所望の堆積区域に案内するように、その流れを制御する工程をさらに含み得る。
(a)第VA族プラズマを、第VA族プラズマ注入口を介して成長チャンバの第1堆積区域に導入する工程であって、第VA族プラズマ注入口と第1堆積区域内に位置する基材との間に直接的な流路が提供される、工程と、
(b)第IIIA族試薬を、第IIIA族試薬注入口を介して成長チャンバの第2堆積区域に導入する工程であって、第2堆積区域は第1堆積区域から実質的に隔離されている、工程と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、追加試薬注入口を介して、前記追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する工程と、
(d)前記基材を第1堆積区域と第2堆積区域との間で移動させる工程とを含み、
それにより基材上に約5E+17原子/cm3未満の炭素不純物含有量を有する薄膜を形成する。
第4態様において、本発明は第2態様または第3態様の方法によって製造された膜に属する。
本発明のさらなる特徴は以下の詳細な説明から明らかになるであろう。
この明細書の全体にわたって、文脈上他の意味に解すべき場合を除き、「備える(comprise)」、「備える(comprises)」および「備える(comprising)」という用語は、明示された整数または整数群を含むことを示唆するが、他の整数または整数群を除外することは示唆しないことが理解されるであろう。
よって、上記に記載された様々な実施形態から、本願に記載する本発明の装置の構成要素は、標準RPCVDアプローチによって達成されるそれと比較して、成長膜中の炭素および/または酸素レベルの低減を依然として達成しながらも、多くの異なる方法で配列され得ることが理解されるであろう。しかしながら、記載する実施形態のすべては、追加試薬が第IIIA族試薬導入点および好ましくは基材に対して、真近ではないにしても近接して(in close if not immediate proximity to)成長チャンバに導入され、成長膜表面の真上において付加物の形成を促進するといった特徴を少なくとも共有する。このアプローチは、膜中への炭素および/または酸素混入のレベルを大幅に低下させることが判明した。炭素および/または酸素混入のレベルをさらに低下させるのを支援する、さらに一般的な特徴としては、デッドスポットを最小限にするために天井および/または側壁と同一平面上で終了する試薬注入口を提供すること、および基材表面上における追加試薬の流路を促すように排気口を配置することに加えて、低いチャンバ天井高さと、従って相応して低減されたチャンバ容積とが挙げられる。
例えば、前記方法は、温度を約400〜約1200℃、好ましくは約500〜約1000℃(約500℃、600℃、700℃、800℃、900℃または1000℃の温度を含む)、より好ましくは約500〜約850℃となるように制御する工程をさらに含み得る。これは、典型的なMOCVDと比べて、また多くのRPCVDアプローチと比べても、比較的低い温度範囲である。より低い温度はTMG熱分解よりも付加物形成を促進し(favour)、そのため膜表面におけるメチルラジカル反応を低減する。
(a)第VA族プラズマを、第VA族プラズマ注入口を介して成長チャンバの第1堆積区域に導入する工程であって、第VA族プラズマ注入口と第1堆積区域内に位置する基材との間に直接的な流路が提供される、工程と、
(b)第IIIA族試薬を、第IIIA族試薬注入口を介して成長チャンバの第2堆積区域に導入する工程であって、第2堆積区域は第1堆積区域から実質的に隔離されている、工程と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、追加試薬注入口を介して、前記追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する工程と、
(d)前記基材を第1堆積区域と第2堆積区域との間で移動させる工程とを含み、
それにより前記基材上に約5E+17原子/cm3未満の炭素含有量を有する薄膜を形成する。
第4態様において、本発明は、第2態様または第3態様の方法によって製造された膜に属する。そのような膜は、標準RPCVDアプローチによって製造された同様の膜と比較して明らかに低レベルの、それらの構造に混入した酸素および/または炭素を有するであろう。一実施形態において、本発明の方法によって生成された膜は約10E+16原子/cm3未満の炭素含有量を有し得る。3E+16原子/cm3の値が得られており、プロセス最適化によって1E+16原子/cm3未満の値を得ることができると考えられる。
実施例は、本発明の装置を用いたプロセスの実施およびそれにより得られた結果をさらに詳細に示している。実施例において、第VA族プラズマとして窒素が用いられ、第IIIA族試薬としてトリメチルガリウムが用いられた。
プラズマ注入口の下に位置するステンレス鋼型シャワーヘッド邪魔板を用いた、本質的に図6および図7で述べたような装置を使用した。プラズマ発生器の出力は500W〜600Wであり、700℃の成長温度を用いた。膜はGaNテンプレート上で成長させた。初期制御の実施は、窒素プラズマと、有機金属試薬としてトリメチルガリウム(TMG)とを用いたが、アンモニアは注入しないで行なった。これは、図2の装置によって製造される場合に予想されるような、すなわち標準レベルの酸素不純物および炭素不純物を有する膜を生成した。
上述したものと同一の装置および条件を用いたが、シャワーヘッド邪魔板を除去して、いくつかの実施を行った。よって、プラズマ発生器、プラズマ注入口および基材の間の直接的な流路は、第1堆積区域内に確立された。
さらなる一連の実験は、第IIIA族試薬としてトリエチルガリウム(TEG)を用いて、異なるアンモニア注入速度を検討して実施した。これらの実験に用いたプロセス条件を以下で表3に述べる。また、注目すべきことは、プラズマ注入口、TEG入口およびアンモニア注入口は、ガスの再循環、すなわちデッドスポットの影響を低減するために、すべて成長チャンバの天井と同一平面上で終了していたということである。前記天井は基材の上方約5.0〜7.5cmの高さで固定され、基材ホルダの回転速度は1200rpmであった。
前述のすべてから、RPCVD構成における分離した堆積区域の使用がGaN膜などの膜への不純物の混入を低減することに有用であり得るが、これらの不純物は顕著な量で生成した膜中に依然として見られるであろうことが認識されるであろう。プラズマ注入口および/または有機金属試薬注入口が、基材の成長表面から約1〜約30cm鉛直上方に位置する成長チャンバ構成の使用。しかしながら、第2堆積区域中に比較的小量のアンモニアを有機金属試薬と同時に導入することにより、膜中の酸素および特に炭素のレベルを劇的に低下させることが示された。同様の条件下だがプラズマ発生器および/またはプラズマ注入口と基材との間に流れを案内するために任意の障害物を除去することは、特に炭素の膜中への混入の非常に驚くべき低減をもたらす。さらなるレベルの制御として、プラズマ発生器出力のパワーの増大は、膜中に見られる炭素不純物のレベルをさらに低下させることができる。
Claims (31)
- 第IIIA−VA族膜を形成するためのRPCVD装置であって、前記装置は成長チャンバを備え、前記成長チャンバは、
(a)前記成長チャンバの第1堆積区域に位置して、前記第1堆積区域に第VA族プラズマを導入する第VA族プラズマ注入口と、
(b)前記成長チャンバの第2堆積区域に位置して、前記第2堆積区域に第IIIA族試薬を導入する第IIIA族試薬注入口と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、該追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する、第IIIA族試薬注入口に隣接した追加試薬注入口と、
(d)1つ以上の基材を支持し、かつ各基材を第1堆積区域と第2堆積区域との間で回転させるのに適合した基材ホルダであって、前記第VA族プラズマおよび前記第IIIA族試薬に前記基材をさらして第IIIA−VA族膜を形成させる基材ホルダとを備える、装置。 - 前記追加試薬注入口はアンモニア注入口である、請求項1に記載の装置。
- 第1堆積区域は、第2堆積区域から実質的に隔離されている、請求項1または2に記載の装置。
- 第VA族プラズマ注入口および第IIIA族試薬注入口のうちの少なくとも一方は、1つ以上の基材の成長表面から1cm〜30cmの距離をおいて成長チャンバに開放している、請求項1乃至3のいずれか1項に記載の装置。
- 第VA族プラズマ注入口または第IIIA族試薬注入口の少なくとも一方は、前記1つ以上の基材の成長表面から鉛直上方1〜30cmに位置する成長チャンバの天井と同一平面上において終了する、請求項1に記載の装置。
- 前記追加試薬注入口は、前記第IIIA族試薬および追加試薬が前記1つ以上の基材と接触する前に前記第IIIA族試薬および前記追加試薬の混合を促進するために、第IIIA族試薬注入口の開口に実質的に隣接して前記成長チャンバに開放している、請求項1乃至5のいずれか1項に記載の装置。
- 前記成長チャンバは、前記第IIIA族試薬および追加試薬が前記1つ以上の基材と接触する前に前記第IIIA族試薬および前記追加試薬の混合を促進するために、前記追加試薬注入口および第IIIA族試薬注入口のうちの少なくとも一方と接触しているか、或いは作動可能に関連した1つ以上の構造であって、流れ乱流を促進する1つ以上の構造を備える、請求項1乃至6のいずれか1項に記載の装置。
- 第VA族プラズマ注入口と前記1つ以上の基材との間には直接的な流路が存在する、請求項1乃至7のいずれか1項に記載の装置。
- 前記追加試薬注入口の開口は、前記1つ以上の基材に隣接して成長チャンバに開口している、請求項1に記載の装置。
- 前記追加試薬注入口は、前記成長チャンバの天井から前記1つ以上の基材の成長表面に隣接した位置にある端部まで下方に延びる、請求項9に記載の装置。
- 第VA族プラズマ注入口および第IIIA族試薬注入口は、前記成長チャンバ内において中央に位置する、請求項1乃至10のいずれか1項に記載の装置。
- 第VA族プラズマ注入口および第IIIA族試薬注入口は、前記成長チャンバ内において周辺に位置する、請求項1乃至10のいずれか1項に記載の装置。
- 前記基材ホルダの回転は、前記1つ以上の基材を第1堆積区域から第2堆積区域へ逐次的に通過させる、請求項1乃至12のいずれか1項に記載の装置。
- RPCVDによって基材上に第IIIA−VA族薄膜を形成する方法であって、該方法は、
(a)第VA族プラズマを、第VA族プラズマ注入口を介して成長チャンバの第1堆積区域に導入する工程と、
(b)第IIIA族試薬を、第IIIA族試薬注入口を介して成長チャンバの第2堆積区域に導入する工程であって、第2堆積区域は第1堆積区域から実質的に隔離されている、工程と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、追加試薬注入口を介して、前記追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する工程と、
(d)前記基材を第1堆積区域と第2堆積区域との間で移動させる工程とを含み、
それにより第VA族プラズマおよび第IIIA族試薬が基材上に第IIIA−VA族薄膜を形成させる、方法。 - 前記追加試薬はアンモニアである、請求項14に記載の方法。
- 前記追加試薬は、第IIIA族注入口の開口に実質的に隣接する第2堆積区域に導入される、請求項14または15に記載の方法。
- 前記追加試薬および第IIIA族試薬は、前記成長チャンバに同時に導入される、請求項14乃至16のいずれか1項に記載の方法。
- 前記第IIIA族試薬は第IIIA族有機金属試薬である、請求項14乃至17のいずれか1項に記載の方法。
- 前記第IIIA族有機金属試薬は、トリメチルガリウム、トリエチルガリウム、トリメチルインジウムおよびトリメチルアルミニウムからなる群より選択される、請求項18に記載の方法。
- 第VA族プラズマは活性窒素種を含有する窒素プラズマである、請求項14乃至19のいずれか1項に記載の方法。
- 1つ以上の前記基材に隣接する第IIIA族試薬と追加試薬との混合を促進する工程をさらに含む、請求項14乃至20のいずれか1項に記載の方法。
- 前記追加試薬の流量は15〜1500sccm(2.54×10−2Pa・m3/s〜2.54Pa・m3/s)である、請求項14乃至21のいずれか1項に記載の方法。
- 前記第VA族プラズマを供給するプラズマ発生器の出力を500〜4000Wとなるように制御する工程をさらに含む、請求項14乃至22のいずれか1項に記載の方法。
- 前記成長チャンバ内の成長圧力は2〜5トル(2.67×102Pa〜6.67×102Pa)である、請求項14乃至23のいずれか1項に記載の方法。
- 前記第VA族プラズマの流量は2000〜3000sccm(3.38Pa・m3/s〜5.07Pa・m3/s)である、請求項14乃至24のいずれか1項に記載の方法。
- 前記成長チャンバ内の温度を400〜1200℃となるように制御する工程をさらに含む、請求項14乃至25のいずれか1項に記載の方法。
- 第VA族プラズマと第IIIA族試薬との混合を防止するために前記第1堆積区域および前記第2堆積区域を隔離する工程をさらに含む、請求項14乃至26のいずれか1項に記載の方法。
- 成長膜をp型ドーピングする工程をさらに含む、請求項14乃至27のいずれか1項に記載の方法。
- RPCVDによって、基材上に5E+17原子/cm3未満の炭素不純物含有量を有する第IIIA−VA族薄膜を形成する方法であって、前記方法は、
(a)第VA族プラズマを、第VA族プラズマ注入口を介して成長チャンバの第1堆積区域に導入する工程であって、第VA族プラズマ注入口と第1堆積区域内に位置する基材との間に直接的な流路が提供される、工程と、
(b)第IIIA族試薬を、第IIIA族試薬注入口を介して成長チャンバの第2堆積区域に導入する工程であって、第2堆積区域は第1堆積区域から実質的に隔離されている、工程と、
(c)アンモニア、ヒドラジン、ジメチルヒドラジンおよび水素プラズマからなる群より選択される追加試薬を、追加試薬注入口を介して、前記追加試薬と第IIIA族試薬とが堆積前に混合するように、第2堆積区域に導入する工程と、
(d)前記基材を第1堆積区域と第2堆積区域との間で移動させる工程とを含み、
それにより第VA族プラズマおよび第IIIA族試薬が前記基材上に5E+17原子/cm3未満の炭素不純物含有量を有する第IIIA−VA族薄膜を形成する、方法。 - 前記炭素不純物含有量は3E+17原子/cm3未満である、請求項29に記載の方法。
- 前記薄膜の酸素不純物含有量は6E+17原子/cm3未満である、請求項29に記載の方法。
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