WO2015064550A1 - 高純度フッ素化炭化水素、プラズマエッチング用ガスとしての使用、及び、プラズマエッチング方法 - Google Patents
高純度フッ素化炭化水素、プラズマエッチング用ガスとしての使用、及び、プラズマエッチング方法 Download PDFInfo
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- WO2015064550A1 WO2015064550A1 PCT/JP2014/078553 JP2014078553W WO2015064550A1 WO 2015064550 A1 WO2015064550 A1 WO 2015064550A1 JP 2014078553 W JP2014078553 W JP 2014078553W WO 2015064550 A1 WO2015064550 A1 WO 2015064550A1
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- Prior art keywords
- fluorinated hydrocarbon
- volume
- ppm
- plasma etching
- fluoride
- Prior art date
Links
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 103
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 71
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 60
- 238000001020 plasma etching Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 19
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 claims abstract description 18
- 150000004767 nitrides Chemical class 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 claims abstract description 5
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 40
- 239000007789 gas Substances 0.000 claims description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229910001868 water Inorganic materials 0.000 claims description 15
- GSMZLBOYBDRGBN-UHFFFAOYSA-N 2-fluoro-2-methylpropane Chemical compound CC(C)(C)F GSMZLBOYBDRGBN-UHFFFAOYSA-N 0.000 description 44
- WGCJTTUVWKJDAX-UHFFFAOYSA-N 1-fluoro-2-methylpropane Chemical compound CC(C)CF WGCJTTUVWKJDAX-UHFFFAOYSA-N 0.000 description 40
- 238000005530 etching Methods 0.000 description 34
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 29
- 238000004519 manufacturing process Methods 0.000 description 26
- 238000010992 reflux Methods 0.000 description 24
- 238000004821 distillation Methods 0.000 description 23
- 229910052581 Si3N4 Inorganic materials 0.000 description 14
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- 239000012535 impurity Substances 0.000 description 12
- 238000012545 processing Methods 0.000 description 11
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 10
- 238000009835 boiling Methods 0.000 description 10
- 238000004817 gas chromatography Methods 0.000 description 10
- 238000005229 chemical vapour deposition Methods 0.000 description 9
- 239000002808 molecular sieve Substances 0.000 description 9
- 239000004065 semiconductor Substances 0.000 description 9
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 9
- 239000011521 glass Substances 0.000 description 8
- 239000005457 ice water Substances 0.000 description 8
- 239000000758 substrate Substances 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 238000000746 purification Methods 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000001577 simple distillation Methods 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 238000012856 packing Methods 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 229910000617 Mangalloy Inorganic materials 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000012025 fluorinating agent Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- PZMKMCFRTKGVOL-UHFFFAOYSA-N 2-methylpropyl methanesulfonate Chemical compound CC(C)COS(C)(=O)=O PZMKMCFRTKGVOL-UHFFFAOYSA-N 0.000 description 3
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- -1 methane hydrocarbons Chemical class 0.000 description 3
- 239000012044 organic layer Substances 0.000 description 3
- 239000012450 pharmaceutical intermediate Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- 238000005160 1H NMR spectroscopy Methods 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 101000956368 Trittame loki CRISP/Allergen/PR-1 Proteins 0.000 description 2
- IAQRGUVFOMOMEM-UHFFFAOYSA-N but-2-ene Chemical compound CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 2
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 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
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- CSJLBAMHHLJAAS-UHFFFAOYSA-N diethylaminosulfur trifluoride Chemical compound CCN(CC)S(F)(F)F CSJLBAMHHLJAAS-UHFFFAOYSA-N 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N monofluoromethane Natural products FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 235000003270 potassium fluoride Nutrition 0.000 description 2
- 239000011698 potassium fluoride Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- AJDIZQLSFPQPEY-UHFFFAOYSA-N 1,1,2-Trichlorotrifluoroethane Chemical compound FC(F)(Cl)C(F)(Cl)Cl AJDIZQLSFPQPEY-UHFFFAOYSA-N 0.000 description 1
- HLVFKOKELQSXIQ-UHFFFAOYSA-N 1-bromo-2-methylpropane Chemical compound CC(C)CBr HLVFKOKELQSXIQ-UHFFFAOYSA-N 0.000 description 1
- IIADOUMJKYSCPM-UHFFFAOYSA-N 2,2-difluorobutane Chemical compound CCC(C)(F)F IIADOUMJKYSCPM-UHFFFAOYSA-N 0.000 description 1
- IXHWZHXLJJPXIS-UHFFFAOYSA-N 2-fluorobutane Chemical compound CCC(C)F IXHWZHXLJJPXIS-UHFFFAOYSA-N 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000012359 Methanesulfonyl chloride Substances 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 description 1
- 229910001632 barium fluoride Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- OSQPUMRCKZAIOZ-UHFFFAOYSA-N carbon dioxide;ethanol Chemical compound CCO.O=C=O OSQPUMRCKZAIOZ-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 208000012839 conversion disease Diseases 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- XNMQEEKYCVKGBD-UHFFFAOYSA-N dimethylacetylene Natural products CC#CC XNMQEEKYCVKGBD-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000895 extractive distillation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical compound FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229940035429 isobutyl alcohol Drugs 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- UBJFKNSINUCEAL-UHFFFAOYSA-N lithium;2-methylpropane Chemical compound [Li+].C[C-](C)C UBJFKNSINUCEAL-UHFFFAOYSA-N 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- QARBMVPHQWIHKH-UHFFFAOYSA-N methanesulfonyl chloride Chemical compound CS(Cl)(=O)=O QARBMVPHQWIHKH-UHFFFAOYSA-N 0.000 description 1
- RQUXJBKONYSFAU-UHFFFAOYSA-N n,n-diethyl-2,3,3,3-tetrafluoropropanamide Chemical compound CCN(CC)C(=O)C(F)C(F)(F)F RQUXJBKONYSFAU-UHFFFAOYSA-N 0.000 description 1
- OBDFQUSHNJZDSN-UHFFFAOYSA-N n-ethylethanamine;1,1,2,3,3,3-hexafluoroprop-1-ene Chemical compound CCNCC.FC(F)=C(F)C(F)(F)F OBDFQUSHNJZDSN-UHFFFAOYSA-N 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- GRJJQCWNZGRKAU-UHFFFAOYSA-N pyridin-1-ium;fluoride Chemical compound F.C1=CC=NC=C1 GRJJQCWNZGRKAU-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- IAQRGUVFOMOMEM-ONEGZZNKSA-N trans-but-2-ene Chemical compound C\C=C\C IAQRGUVFOMOMEM-ONEGZZNKSA-N 0.000 description 1
- ILWRPSCZWQJDMK-UHFFFAOYSA-N triethylazanium;chloride Chemical compound Cl.CCN(CC)CC ILWRPSCZWQJDMK-UHFFFAOYSA-N 0.000 description 1
- ZQINJXJSYYRJIV-UHFFFAOYSA-N trimethyl(2-methylpropoxy)silane Chemical compound CC(C)CO[Si](C)(C)C ZQINJXJSYYRJIV-UHFFFAOYSA-N 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C19/00—Acyclic saturated compounds containing halogen atoms
- C07C19/08—Acyclic saturated compounds containing halogen atoms containing fluorine
-
- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
- H01L21/32136—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas
- H01L21/32137—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas of silicon-containing layers
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/08—Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
-
- 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
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
-
- 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
-
- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
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- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
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- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
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- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
- H01L21/32136—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas
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- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/334—Etching
Definitions
- the present invention relates to a fluorinated hydrocarbon (isobutyl) useful as a gas for plasma etching such as etching and chemical vapor deposition (CVD), a fluorine-containing pharmaceutical intermediate, or a hydrofluorocarbon solvent, which is useful in the field of manufacturing semiconductor devices.
- a fluorinated hydrocarbon isobutyl
- a fluorine-containing pharmaceutical intermediate such as etching and chemical vapor deposition (CVD)
- a hydrofluorocarbon solvent which is useful in the field of manufacturing semiconductor devices.
- Fluoride and t-butyl fluoride Fluoride and t-butyl fluoride).
- High-purity fluorinated hydrocarbons are particularly suitable for plasma etching gas, CVD gas, etc. in the field of manufacturing semiconductor devices using plasma reaction.
- the present applicant has also developed a plasma etching gas that can handle the most advanced plasma etching process, and saturated fluorinated non-methane hydrocarbons with a small number of fluorine atoms are currently etching silicon nitride films. It has been found that it has a performance superior to that of monofluoromethane which is widely used in (patent document 1). However, in recent years, semiconductor manufacturing technology has been increasingly miniaturized, and a higher performance gas is required for a plasma etching gas used in a plasma etching process.
- isobutyl fluoride and t-butyl fluoride are production methods.
- the following method is disclosed as a manufacturing method of isobutyl fluoride.
- isobutyl alcohol is converted to 1-trimethylsiloxy-2-methylpropane by reaction with chlorotrimethylsilane in the presence of pyridine, and this is contacted with diethylaminosulfur trifluoride which is a fluorinating agent. Describes a process for obtaining a mixture of isobutyl fluoride and t-butyl fluoride.
- Patent Document 3 discloses that n-pentane solution of t-butyl lithium is brought into contact with sulfur hexafluoride to obtain t-butyl fluoride (t-butyl fluoride). It is described that the generation of Non-Patent Document 1 describes that t-butyl fluoride was obtained in a yield of 78% by contacting t-butanol with a diethylamine adduct of hexafluoropropene as a fluorinating agent. .
- Non-Patent Document 2 describes that t-butyl fluoride was obtained in a yield of 60% by treating t-butanol with 60% hydrofluoric acid.
- Non-Patent Document 3 t-butyl fluoride was obtained in a yield of 60% by adding hydrogen fluoride to 2-methylpropene using a hydrogen fluoride-pyridine complex as a fluorinating agent. It is described.
- An object of the present invention is to provide high-purity fluorinated hydrocarbons (isobutyl fluoride and t-butyl fluoride), use of the high-purity fluorinated hydrocarbons as a gas for plasma etching, and a plasma etching method. To do.
- the present inventor used isobutyl fluoride obtained by the method described in the above prior art as a gas for selectively plasma-etching a silicon nitride film laminated on silicon or a silicon oxide film. And t-butyl fluoride.
- isobutyl fluoride or t-butyl fluoride contains a predetermined amount of butenes, and the present invention has been completed.
- the fluorinated hydrocarbons (1) to (3) the use of (4) the fluorinated hydrocarbon as a plasma etching gas, and the plasma etching method (5).
- Purity is 99.9% by volume or more, butenes contained are 1000 ppm by volume or less in total: R—F (wherein R is an isobutyl group or a t-butyl group)
- R—F wherein R is an isobutyl group or a t-butyl group
- the first of the present invention is characterized in that the purity is 99.9% by volume or more, and the total content of butenes is 1000 ppm by volume or less.
- F (wherein R represents an isobutyl group or a t-butyl group) (hereinafter sometimes referred to as “fluorinated hydrocarbon (1)”).
- the fluorinated hydrocarbon (1) is specifically isobutyl fluoride and t-butyl fluoride.
- the purity of fluorinated hydrocarbon (1) and the content of butenes are values calculated from the peak area by gas chromatography using a flame ionization detector (FID) as a detector.
- Butenes can be identified by gas chromatography mass spectrometry.
- the amount of nitrogen and oxygen in the fluorinated hydrocarbon (1) is a value measured by gas chromatography using a thermal conductivity detector (TCD) as a detector.
- TCD thermal conductivity detector
- the water content in the fluorinated hydrocarbon (1) is a value measured using FT-IR.
- Butenes contained in the fluorinated hydrocarbon (1) include 1-butene (boiling point -6.3 ° C.), 2-butene ((E) -2-butene (boiling point 3.73 ° C.) and (Z) -2. -Butene (boiling point 0.88 ° C)) and isobutene (boiling point -6.9 ° C).
- the one or more butenes present in the fluorinated hydrocarbon (1) are all impurities.
- isobutyl fluoride is a method of fluorinating isobutanol using a fluorinating agent; isobutyl bromide or alkyl sulfonic acid isobutyl ester, alkali metal such as potassium fluoride or cesium fluoride It can manufacture by methods, such as the method of processing with a fluoride;
- T-Butyl fluoride can be produced by a method of treating t-butanol with hydrofluoric acid or an amine complex of hydrogen fluoride.
- the crude fluorinated hydrocarbon (1) obtained by the above production method can be purified by distillation purification (rectification).
- the purification method such as rectification, the amount of butenes contained in the fluorinated hydrocarbon (1) can be reduced to 1000 ppm by volume or less, preferably 500 ppm by volume or less.
- the crude fluorinated hydrocarbon (1) is subjected to distillation purification to remove organic impurities including butenes.
- distillation purification to remove organic impurities including butenes.
- a rectifying column having an appropriate number of theoretical plates is used.
- the number of theoretical plates is usually 10 or more and 50 or less, preferably 20 or more and 50 or less.
- the target is due to the vaporization phenomenon in the fraction extraction line of the rectification column Separation from isobutyl fluoride (boiling point 20-22 ° C.) or t-butyl fluoride (boiling point 12-13 ° C.) is apparently worse. Therefore, it is preferable that the fraction extraction line and the container for storing the initial fraction are well cooled.
- the pressure during rectification is a gauge pressure, and is usually from normal pressure to 10 atm, preferably from normal pressure to 5 atm.
- the ratio of the reflux amount to the withdrawal amount (hereinafter sometimes referred to as “reflux ratio”) is set to a reflux ratio of 30: 1 or more in order to efficiently separate butenes that are likely to be in a gas state, particularly isobutene. Is preferred. If the reflux ratio is too small, butenes are not efficiently separated, not only the purity improvement is reduced, but the initial fraction is increased, and the total amount of isobutyl fluoride or t-butyl fluoride recovered is increased. Less. On the other hand, if the reflux ratio is too large, it takes a lot of time to recover per extraction, so that the rectification itself takes a lot of time and the productivity is poor.
- a batch system or a continuous system may be employed, but the batch system is preferably employed when the production amount is small, and when the production amount is large, the continuous system passes through several rectification towers. Is preferably employed. Moreover, you may carry out combining the extractive distillation operation which added the extraction solvent.
- the raw material compound is separated by the first distillation, and butenes that are the target of impurities are separated by the second distillation.
- Equal stepwise distillation may be performed. Even in that case, the reflux ratio is preferably 30: 1 or more.
- nitrogen and oxygen are extracted together with the fluorinated hydrocarbon (1) by simple distillation to reduce the amount of nitrogen and oxygen in the fluorinated hydrocarbon (1) remaining in the kettle. be able to.
- the amount of the fluorinated hydrocarbon (1) to be extracted is preferably 20 to 50%, more preferably 30 to 40%, based on the weight with respect to the fluorinated hydrocarbon (1) charged in the distillation still.
- the extracted fluorinated hydrocarbon (1) is stored and can be recovered and reused by adding to the next batch.
- the amount of nitrogen in the fluorinated hydrocarbon (1) is preferably 100 ppm by volume or less, more preferably 80 ppm by volume or less, and the amount of oxygen is preferably 50 ppm by volume or less, more preferably 30 ppm by volume or less. It is.
- moisture content in fluorinated hydrocarbon (1) general methods, such as making it contact with adsorption agent, are employable.
- a so-called molecular sieve or alumina which is a synthetic zeolite can be used.
- molecular sieve 3A is preferred for drying mono- or difluoro hydrocarbons such as 2-fluorobutane and 2,2-difluorobutane.
- alumina it is preferable to use activated alumina having low crystallinity produced by heat dehydration of alumina hydrate.
- the fluorinated hydrocarbon (1) Prior to contacting with the fluorinated hydrocarbon (1), it is preferable to activate an adsorbent such as molecular sieve or alumina by an operation such as calcination because more water can be adsorbed.
- an adsorbent such as molecular sieve or alumina
- the amount of water in the fluorinated hydrocarbon (1) can be reduced to 50 ppm by volume or less. If the amount of moisture contained in the fluorinated hydrocarbon (1) is large, moisture will remain adsorbed on the processed surface after etching the substrate, peeling of the laminated film in the wiring formation process of copper, etc., and corrosion of the embedded wiring Therefore, it is preferable that the water content is reduced as much as possible. From this viewpoint, the water content in the fluorinated hydrocarbon (1) is preferably 50 ppm by volume or less, more preferably 20 ppm by volume or less.
- the highly purified fluorinated hydrocarbon (1) of the present invention can be obtained.
- the resulting fluorinated hydrocarbon (1) is contacted with an adsorbent to remove moisture and / or the fluorinated hydrocarbon (1) is simply distilled to obtain a fluorinated carbonization. Reducing nitrogen concentration in hydrogen (1), preferably 100 ppm by volume or less, more preferably 50 ppm by volume or less, and oxygen concentration, preferably 50 ppm by volume or less, more preferably 20 ppm by volume or less. As a result, a further highly purified fluorinated hydrocarbon (1) can be obtained.
- the highly purified fluorinated hydrocarbon (1) of the present invention is useful in the field of semiconductor device manufacturing, such as plasma etching gas such as etching and chemical vapor deposition (CVD), fluorine-containing pharmaceutical intermediate, or It is useful as a hydrofluorocarbon solvent.
- the highly purified fluorinated hydrocarbon (1) of the present invention is particularly suitable for a plasma etching gas, a CVD gas, or the like in the field of manufacturing a semiconductor device using a plasma reaction.
- the second aspect of the present invention is the use of the fluorinated hydrocarbon (1) of the present invention as a plasma etching gas.
- the fluorinated hydrocarbon (1) of the present invention has etching selectivity with respect to an inorganic nitride film with respect to a silicon or silicon oxide film.
- the fluorinated hydrocarbon (1) of the present invention When used as a plasma etching gas, it consists of helium, neon, argon, xenon, and krypton for the control of the concentration of etching species generated in the plasma and the control of ion energy. You may add and use at least 1 sort (s) of inert gas selected from a group.
- the addition amount of the inert gas is preferably such that the total amount of the inert gas with respect to the fluorinated hydrocarbon (1) is 2 to 200 in a volume ratio [inert gas / fluorinated hydrocarbon (1))], More preferably, it is 5 to 150.
- O 2 and / or O 3 may be added and used for relaxing the etching stop.
- Amount of O 2 and O 3, the total amount of O 2 and O 3 to fluorinated hydrocarbon (1) is, in a volume ratio [(O 2 and / or O 3) / fluorinated hydrocarbons (1)] It is preferably 0.1 to 50, and more preferably 0.5 to 30.
- the third aspect of the present invention is a method of selectively plasma etching an inorganic nitride film laminated on silicon or a silicon oxide film by using the fluorinated hydrocarbon (1) of the present invention as a plasma etching gas. This is a plasma etching method.
- the object to be processed used in the present invention is an inorganic nitride film.
- the inorganic nitride film include a silicon nitride film, a silicon nitride oxide film, and a titanium nitride film.
- the inorganic nitride film is usually formed on the substrate to be processed.
- the substrate to be processed include a glass substrate, a silicon single crystal wafer, a gallium arsenide substrate, and the like. Further, a silicon film, a silicon oxide film, or the like may be formed on these substrates.
- an inorganic nitride film laminated on silicon or a silicon oxide film is used as a mask and a resist pattern formed on the inorganic nitride film is used as a mask for plasma etching of a predetermined region of the inorganic nitride film.
- the resist pattern can be formed, for example, by patterning by forming a photosensitive resist composition on a silicon oxide film and irradiating the mask pattern with radiation of 195 nm or less.
- the inorganic nitride film with resist pattern (object to be processed) obtained as described above is placed in a processing chamber (etching chamber) having a plasma generator, and the processing chamber is deaerated. Then, the fluorinated hydrocarbon (1), which is a component of the processing gas to be used, and, if desired, oxygen gas and group 18 gas are introduced into the processing chamber at a predetermined speed and a predetermined pressure, respectively. .
- the introduction speed of the processing gas may be proportional to the ratio of each component used, for example, 5 to 30 sccm for the fluorinated hydrocarbon (1), 10 to 50 sccm for the oxygen gas, 100 to 500 sccm for the group 18 gas, and the like.
- the pressure in the processing chamber into which the processing gas is introduced is usually 0.0001 to 1300 Pa, preferably 0.13 to 5 Pa.
- a plasma generator generates plasma by applying a high-frequency electric field to the fluorinated hydrocarbon (1) in the processing chamber to cause glow discharge.
- plasma generators include helicon wave type, high frequency induction type, parallel plate type, magnetron type, and microwave type devices, but parallel plate type, high frequency induction because plasma generation in a high density region is easy.
- the apparatus of a system and a microwave system is used suitably.
- the plasma density is not particularly limited, but from the viewpoint of better expressing the effects of the present invention,
- the plasma density is preferably 10 12 ions / cm 3 or more, more preferably 10 12 to 1 Etching is preferably performed in a high-density plasma atmosphere of 0 13 ions / cm 3 .
- the temperature reached by the substrate to be processed at the time of etching is not particularly limited, but is preferably in the range of ⁇ 50 to + 300 ° C., more preferably ⁇ 20 to + 200 ° C., and further preferably ⁇ 10 to + 100 ° C.
- the temperature of the substrate may or may not be controlled by cooling or the like.
- the time for the etching process is generally 5 to 10 minutes. However, since the processing gas used in the present invention can be etched at a high speed, the productivity can be improved in 2 to 5 minutes.
- the plasma etching method of the present invention it is possible to easily and efficiently form a contact hole having a fine diameter and a high aspect ratio without necking.
- GC part HP-6890 (manufactured by Agilent)
- MS part 5973 NETWORK made by Agilent Detector EI type (acceleration voltage: 70eV) 1 H and 19 F-NMR measuring apparatus: JNM-ECA-400 (manufactured by JEOL Ltd.) 400 MHz ⁇ Nitrogen and oxygen (gas chromatography analysis)
- GC part HP-7890 (manufactured by Agilent)
- Column temperature held at 40 ° C. for 5 minutes, then heated up at 5 ° C./minute, then held at 65 ° C. for 1 minute
- Gas sampler 50 ° C.
- Carrier gas Helium detector: Pulse discharge type, moisture measurement (FT-IR) IG-1000 (Otsuka Electronics Co., Ltd.)
- Cell material Barium fluoride Cell length: 10m
- the mixture was further stirred for 2 hours while being cooled with ice water. Thereafter, the contents were analyzed by gas chromatography. As a result, the raw material t-butanol disappeared.
- the reaction solution was poured into a separatory funnel containing ice water, the organic layer was washed, further washed with cooled saturated multi-layer water and ice water, and dried over magnesium sulfate. After filtration, the organic layer was analyzed by gas chromatography.
- Example 1 Rectification of isobutyl fluoride 423 g of crude isobutyl fluoride obtained by repeating Production Examples 1 and 2 was charged into a distillation kettle, and a KS type rectification column (manufactured by Toshin Seiki Co., Ltd., column length: 60 cm) Distillation was performed using the filler Helipak No. 1). A refrigerant of ⁇ 20 ° C. was circulated through the condenser, and total reflux was performed for about 1 hour. The distillation kettle was heated at 45 to 70 ° C., taking into account the temperature at the top of the column and the remaining amount inside the kettle. After total reflux, the fraction was extracted at a reflux ratio of 45: 1. As a result, 247 g of 99.941 area (volume)% isobutyl fluoride was obtained, and 543 area (volume) ppm of isobutene was contained as an impurity.
- KS type rectification column manufactured by Toshin Seiki Co., Ltd.
- Example 2 240 g of isobutyl fluoride distilled and purified in Example 1 was placed in a 1.2-liter SUS316 container (inner surface: electrolytic polishing treatment) containing 100 g of molecular sieve 3A (Union Showa) at about 25 ° C. Soaked for 22 hours. Thereafter, a simple distillation apparatus equipped with a short column, a condenser, and a receiver was assembled on the top of a 0.5 L SUS316 kettle, and cooling water at ⁇ 10 ° C. was circulated through the condenser. The kettle was charged with 227 g of isobutyl fluoride from which moisture was removed, and the kettle was heated to 40 ° C.
- the nitrogen and oxygen concentrations in the isobutyl fluoride at this time were measured by gas chromatography and found to be 534 ppm by volume and 130 ppm by volume, respectively.
- the simple distillation was stopped and the kettle was cooled to 25 ° C.
- Isobutyl fluoride in the kettle was charged with 148 g of a 0.5 L manganese steel cylinder (inner surface roughness: 1S) equipped with a diaphragm valve.
- the purity of isobutyl fluoride is 99.947 area (volume)%
- the content of isobutene is 414 area (volume) ppm
- the contents of nitrogen, oxygen, and moisture are 67 volume ppm, 10 volume ppm, And 12 volume ppm.
- Example 3 387 g of crude isobutyl fluoride obtained by repeating the reactions of Production Examples 1 and 2 was charged into a distillation kettle, and a KS type rectification column (manufactured by Toshin Seiki Co., Ltd., column length: 60 cm, packing material: Helipak No. 1) Distillation was performed using A refrigerant of ⁇ 20 ° C. was circulated through the condenser, and total reflux was performed for about 1 hour. The distillation kettle was heated from 45 to 70 ° C. in consideration of the temperature at the top of the column and the remaining amount inside the kettle. After total reflux, the fraction was withdrawn at a reflux ratio of 30: 1. As a result, 213 g of 99.913 area (volume)% isobutyl fluoride was obtained, and 834 area (volume) ppm of isobutene was contained as an impurity.
- KS type rectification column manufactured by Toshin Seiki Co., Ltd., column length: 60 cm, packing material:
- Example 4 210 g of isobutyl fluoride obtained in Example 3 was immersed in 20 g of alumina (manufactured by JGC Catalysts & Chemicals, product name “N612N”) in a 0.5 L stainless steel container at 25 ° C. for 20 hours. A stainless steel container and a 0.5 L manganese steel cylinder were connected with a stainless steel tube, and isobutyl fluoride was filled into the cylinder under reduced pressure through a metal filter having a pore diameter of 0.2 ⁇ m.
- alumina manufactured by JGC Catalysts & Chemicals, product name “N612N”
- the cylinder was cooled with ice water, and about 20 g of isobutyl fluoride was withdrawn through a pressure controller while reducing the pressure with a vacuum pump under a pressure of 5 to 10 kPa. After returning to about 25 ° C. and allowing to stand for a while, the isobutyl fluoride purity is 99.918 area (volume)%, the content of isobutene is 791 area (volume) ppm, and the contents of nitrogen, oxygen, and moisture Were 41 ppm by volume, 13 ppm by volume, and 38 ppm by volume, respectively.
- Example 5 423 g of crude t-butyl fluoride obtained by repeating Production Example 3 was charged into a distillation kettle, and a KS type rectification tower (manufactured by Toshin Seiki Co., Ltd., column length 60 cm, packing helicopt No. 1) was used. Distillation was performed. A refrigerant of ⁇ 20 ° C. was circulated through the condenser, and total reflux was performed for about 1 hour. The distillation kettle was heated at 45-60 ° C., taking into account the temperature at the top of the column and the remaining amount inside the kettle. After total reflux, the fraction was extracted at a reflux ratio of 40: 1. As a result, 247 g of 99.931 area (volume)% t-butyl fluoride was obtained, and 627 area (volume) ppm of isobutene was contained as an impurity.
- a KS type rectification tower manufactured by Toshin Seiki Co., Ltd., column length 60 cm, packing helicop
- Example 6 Into a 0.5 L container made of SUS316 (inner surface: electrolytic polishing treatment) containing 25 g of molecular sieve 3A (Union Showa), 240 g of t-butyl fluoride distilled and purified in Example 5 was added. It was immersed at 20 ° C. for 20 hours. Thereafter, a simple distillation apparatus equipped with a short column, a condenser and a receiver was assembled on the top of a 0.5 L SUS316 kettle, and -15 ° C. cooling water was circulated in the condenser. The kettle was charged with 231 g of t-butyl fluoride from which water had been removed, and the kettle was heated to 30 ° C.
- SUS316 inner surface: electrolytic polishing treatment
- 3A Union Showa
- the nitrogen and oxygen concentrations in the t-butyl fluoride at this time were measured by gas chromatography and found to be 710 ppm by volume and 266 ppm by volume, respectively.
- simple distillation was stopped and the kettle was cooled to about 25 ° C.
- t-butyl fluoride was charged with 144 g of a 0.5 L manganese steel cylinder (inner surface roughness: 1S) with a diaphragm valve.
- the content of isobutene in t-butyl fluoride was 596 area (volume) ppm, and the contents of nitrogen, oxygen, and water were 72 ppm, 22 ppm, and 16 ppm by volume, respectively.
- Example 7 389 g of crude t-butyl fluoride obtained by repeating the reaction of Production Example 3 was charged into a distillation kettle, and a KS type rectification column (manufactured by Toshin Seiki Co., Ltd., column length: 60 cm, packing material: Helipak No. 1) was used. And distilled. A refrigerant of ⁇ 20 ° C. was circulated through the condenser, and total reflux was performed for about 1 hour. The distillation kettle was heated from 45 to 60 ° C. in consideration of the temperature at the top of the column and the remaining amount inside the kettle. After total reflux, the fraction was withdrawn at a reflux ratio of 30: 1. As a result, 198 g of 99.906 area (volume)% t-butyl fluoride was obtained, and 902 area (volume) ppm of isobutene was contained as an impurity.
- a KS type rectification column manufactured by Toshin Seiki Co., Ltd., column length: 60 cm,
- Example 8 187 g of t-butyl fluoride obtained in Example 7 was added to 18 g of molecular sieve (manufactured by Tosoh, product name “Zeoram (registered trademark) A-3”) in a stainless steel container having a capacity of 0.5 L for about 18 hours. It was immersed at 25 ° C. A stainless steel container and a 0.5 L manganese steel cylinder were connected with a stainless steel tube, and t-butyl fluoride was filled into the cylinder under reduced pressure through a metal filter having a pore diameter of 0.2 ⁇ m.
- molecular sieve manufactured by Tosoh, product name “Zeoram (registered trademark) A-3
- the cylinder was cooled with ice water, and about 20 g of t-butyl fluoride was withdrawn through a pressure controller while reducing the pressure with a vacuum pump at a pressure of 5 to 10 kPa. After returning to 25 ° C. and allowing to stand for a while, the content of isobutene in t-butyl fluoride is 889 area (volume) ppm, and the contents of nitrogen, oxygen, and water are 66 ppm by volume and 14% by volume, respectively. ppm and 39 ppm by volume.
- Example 9 Plasma etching evaluation: Using a wafer having a silicon nitride film formed on the surface and a wafer having a silicon oxide film formed on the surface, each wafer was etched separately. Then, the etching rates of the silicon nitride film and the silicon oxide film were measured, and the selection ratio (SiN film / SiO 2 film) was obtained from the etching rate ratio of the silicon nitride film to the silicon oxide film based on these measurement results. A wafer with a silicon nitride film formed on the surface and a wafer with a silicon oxide film formed on the surface were set in an etching chamber of a parallel plate plasma etching apparatus, respectively, and the system was evacuated.
- Etching was performed using the prepared isobutyl fluoride under the following etching conditions. As a result, the etching rate of the silicon nitride film was 28 nm / min, and the silicon oxide film was not etched. For this reason, the selection ratio (SiN film / SiO 2 film) was infinite.
- Etching conditions Pressure of mixed gas: 6.7 Pa High frequency power supply of upper electrode: 200W High frequency power supply power of lower electrode: 100W Distance between upper electrode and lower electrode: 50 mm Electrode temperature: 20 ° C Gas flow rate O 2 gas: 60 sccm Isobutyl fluoride: 45sccm Etching time: 180 seconds [Example 10] Etching evaluation was performed in the same manner as in Example 9 except that isobutyl fluoride was changed to that prepared in Example 4. As a result, the etching rate of the silicon nitride film was 25 nm / min, and the silicon oxide film was not etched. For this reason, the selection ratio (SiN film / SiO 2 film) was infinite.
- Example 11 Etching evaluation was performed under the following conditions except that in Example 9, isobutyl fluoride was changed to t-butyl fluoride prepared in Example 6. As a result, the etching rate of the silicon nitride film was 30 nm / min, and the silicon oxide film was not etched. For this reason, the selection ratio (SiN film / SiO 2 film) was infinite.
- High frequency power supply of upper electrode 200W
- High frequency power supply power of lower electrode 100W Distance between upper electrode and lower electrode: 50 mm
- Etching time 180 seconds
- Example 12 Etching evaluation was performed in the same manner as in Example 11 except that t-butyl fluoride was changed to that prepared in Example 8. As a result, the etching rate of the silicon nitride film was 24 nm / min, and the silicon oxide film was not etched. For this reason, the selection ratio (SiN film / SiO 2 film) was infinite.
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Abstract
Description
しかしながら、近年、半導体製造技術の微細化がますます進行しており、プラズマエッチングプロセスに用いるプラズマエッチング用ガスにも、より高性能なものが求められている。
(a)イソブチルフルオリドの製造方法としては以下の方法が開示されている。
特許文献2においては、イソブチルアルコールをピリジン存在下に、クロロトリメチルシランを反応させて、1-トリメチルシロキシ-2-メチルプロパンに変換し、これをフッ素化剤であるジエチルアミノサルファートリフルオリドと接触させることにより、イソブチルフルオリドと、t-ブチルフルオリドの混合物を得る方法が記載されている。
(b)t-ブチルフルオリドの製造方法としては、特許文献3には、六フッ化硫黄に、t-ブチルリチウムのn-ペンタン溶液を接触させて、フッ化t-ブチル(t-ブチルフルオリド)の生成を確認したことが記載されている。
また、非特許文献1には、t-ブタノールをフッ素化剤であるヘキサフルオロプロペンのジエチルアミン付加物と接触させることにより、t-ブチルフルオリドを収率78%で得たことが記載されている。
非特許文献2には、t-ブタノールを60%フッ化水素酸で処理することにより、収率60%でt-ブチルフルオリドが得られたことが記載されている。
非特許文献3には、2-メチルプロペンに、フッ化水素-ピリジン錯体をフッ素化剤に用いて、フッ化水素を付加させることにより、t-ブチルフルオリドが収率60%で得られたことが記載されている。
そこで、更に詳細に検討した結果、イソブチルフルオリド又はt-ブチルフルオリド中に、ブテン類を所定量以上含むとこの問題が生じることを見いだし、本発明を完成するに至った。
(1)純度が99.9容量%以上、含まれるブテン類が合計で1000容量ppm以下であることを特徴とする、式:R-F(式中、Rは、イソブチル基又はt-ブチル基を表す。)で表されるフッ素化炭化水素。
(2)窒素含有量が100容量ppmで、酸素含有量が50容量ppm以下である、(1)に記載のフッ素化炭化水素。
(3)水分含有量が50容量ppm以下である、(1)に記載のフッ素化炭化水素。
(4)前記(1)~(3)のいずれかに記載のフッ素化炭化水素のプラズマエッチング用ガスとしての使用。
(5)前記(1)~(3)のいずれかに記載のフッ素化炭化水素をプラズマエッチング用ガスとして用いて、シリコン又はシリコン酸化膜上に積層された無機窒化膜を選択的にプラズマエッチングするプラズマエッチング方法。
本発明の高純度化されたフッ素化炭化水素(イソブチルフルオリド及びt-ブチルフルオリド)は、特に、プラズマ反応を用いた半導体装置の製造分野において、プラズマ用エッチングガスやCVD用ガス等に好適である。
1)高純度フッ素化炭化水素
本発明の第1は、純度が99.9容量%以上、含まれるブテン類が合計で1000容量ppm以下であることを特徴とする、式(1):R-F(式中、Rは、イソブチル基又はt-ブチル基を表す。)で表されるフッ素化炭化水素である(以下、「フッ素化炭化水素(1)」ということがある。)。フッ素化炭化水素(1)は、具体的には、イソブチルフルオリド及びt-ブチルフルオリドである。
フッ素化炭化水素(1)中の窒素と酸素の量は、熱電導度検出器(TCD)を検出器としたガスクロマトグラフィーにより測定した値である。
また、フッ素化炭化水素(1)中の水分量は、FT-IRを用いて測定した値である。
蒸留精製により有機系不純物を除去する場合、適度な理論段数を持つ精留塔が用いられる。理論段数は通常10段以上、50段程度以下であり、好ましくは20段以上、50段程度以下である。
抜出すフッ素化炭化水素(1)の量は、蒸留釜に仕込まれたフッ素化炭化水素(1)に対し、重量基準で20~50%が好ましく、30~40%がより好ましい。抜き出されたフッ素化炭化水素(1)は貯留しておき、次のバッチに加えることで回収、再使用が可能である。
吸着剤としては、合成ゼオライトである通称モレキュラーシーブやアルミナ等を用いることができる。特願2012-165797号に記載されているように、2-フルオロブタンや2,2-ジフルオロブタンのような、モノ又はジフルオロ炭化水素の乾燥については、モレキュラーシーブ3Aが好ましい。
モレキュラーシーブ4A及び5A等は細孔径が大きく、モレキュラーシーブ3A同様に水分を低減することができるが、接触時に細孔内に吸着している窒素、酸素を放出するので、フッ素化炭化水素(1)中の窒素、酸素濃度を大きくしてしまうおそれがある。
また、アルカリ性を帯びたモレキュラーシーブの使用は、フッ素化炭化水素(1)の脱HF反応を引き起こし易いので、使用に際しては注意を要する。
アルミナとしては、アルミナ水和物の加熱脱水により生成する、結晶性の低い活性アルミナの使用が好ましい。
フッ素化炭化水素(1)と吸着剤とを接触させることにより、フッ素化炭化水素(1)中の水分量を50容量ppm以下に低減することが可能である。
フッ素化炭化水素(1)に含まれる水分量が多いと、基板をエッチング加工した後に、加工面に水分が吸着残存し、銅等の配線形成工程で積層膜の剥がれや、埋め込んだ配線の腐食を起こす恐れがあるので、水分量は可能な限り低減されていることが好ましい。
この観点から、フッ素化炭化水素(1)中の水分量は、好ましくは50容量ppm以下、より好ましくは20容量ppm以下である。
また、さらに、得られたフッ素化炭化水素(1)を吸着剤と接触させることにより、水分を除去する工程、及び/又は、フッ素化炭化水素(1)を単蒸留することにより、フッ素化炭化水素(1)中の、窒素濃度を、好ましくは100容量ppm以下、より好ましくは50容量ppm以下、酸素濃度を、好ましくは50容量ppm以下、より好ましくは20容量ppm以下に低減する工程とを経て、さらに高純度化されたフッ素化炭化水素(1)を得ることができる。
本発明の高純度化されたフッ素化炭化水素(1)は、特に、プラズマ反応を用いた半導体装置の製造分野において、プラズマエッチング用ガスやCVD用ガス等に好適である。
本発明の第2は、本発明のフッ素化炭化水素(1)のプラズマエッチング用ガスとしての使用である。
本発明のフッ素化炭化水素(1)は、シリコン又はシリコン酸化膜に対して、無機窒化膜に対して、エッチング選択性を有する。
不活性ガスの添加量は、フッ素化炭化水素(1)に対する不活性ガスの合計量が、容量比〔不活性ガス/フッ素化炭化水素(1))〕で2~200となることが好ましく、5~150となることがより好ましい。
本発明の第3は、本発明のフッ素化炭化水素(1)をプラズマエッチング用ガスとして用いて、シリコン又はシリコン酸化膜上に積層された無機窒化膜を選択的にプラズマエッチングするプラズマエッチング方法である。
無機窒化膜としては、窒化シリコン膜、窒化酸化シリコン膜、窒化チタン膜等が挙げられる。
無機窒化膜は、通常、被処理基板に形成されてなる。被処理基板としては、例えば、ガラス基板、シリコン単結晶ウエハー、ガリウム-砒素基板等が挙げられる。また、これららの基板上に、シリコン膜や酸化ケイ素膜等が形成されたものであってもよい。
処理ガスが導入された処理室内の圧力は、通常0.0013~1300Pa、好ましくは0.13~5Paである。
プラズマ密度が、好ましくは1012イオン/cm3以上、より好ましくは1012~1
013イオン/cm3の高密度プラズマ雰囲気下でエッチングを行うのが望ましい。
エッチング処理の時間は、一般的には5~10分であるが、本発明に用いる処理ガスは、高速エッチングが可能なので、2~5分として生産性を向上させることができる。
・ガスクロマトグラフィー分析(GC分析)
装置:HP-6890(アジレント社製)
カラム:ジーエルサイエンス社製 Inert Cap-1、長さ60m、内径0.25mm、膜厚1.5μm
カラム温度:40℃で10分間保持、次いで、20℃/分で昇温し、その後240℃で10分間保持
インジェクション温度:200℃
キャリヤーガス:窒素
スプリット比:100/1
検出器:FID
GC部分:HP-6890(アジレント社製)
カラム:ジーエルサイエンス社製 Inert Cap-1、長さ60m、内径0.25mm、膜厚1.5μm
カラム温度:40℃で10分間保持、次いで、20℃/分で昇温し、その後、240℃で10分間保持MS部分:アジレント社製 5973 NETWORK
検出器 EI型(加速電圧:70eV)
・1H、及び19F-NMR測定
装置:JNM-ECA-400(日本電子社製)400MHz
・窒素・酸素(ガスクロマトグラフィー分析)
GC部分:HP-7890(アジレント社製)
カラム:アジレント社製 HP-5 長さ30m、内径0.32mm、膜厚0.25μm
カラム温度:40℃で5分間保持し、次いで、5℃/分で昇温し、その後、65℃で1分間保持
ガスサンプラー:50℃
キャリヤーガス:ヘリウム
検出器:パルス放電型
・水分測定(FT-IR)
IG-1000(大塚電子社製)
セル材質:フッ化バリウム
セル長:10m
攪拌機、滴下ロート、ジムロート型コンデンサーを付した容量2Lのガラス製反応器に、イソブタノール(74g)、メタンスルホニルクロリド(130g)、乾燥ジイソプロピルエーテル(500ml)を仕込み、窒素雰囲気下に置いた。反応器を氷水で冷却し、滴下ロートからトリエチルアミン(121g)を約2時間かけて滴下した。滴下終了後、30分間0℃で撹拌し、その後、約25℃で6時間撹拌を継続した。
反応液に氷水500ml添加して、生成したトリエチルアミン塩酸塩を溶解し、2層分離した。上層の有機層を5%塩酸、飽和重層水、次いで、飽和食塩水で洗浄後、硫酸マグネシウムで乾燥した。その後、ロータリーエバポレーターでジイソプロピルエーテルを留去、真空ポンプでポンプアップし、粗メタンスルホニルオキシイソブタン118gが得られた。
攪拌機、滴下ロート、留分補集用受器、及びジムロート型コンデンサーを付した容量1Lのガラス製反応器に、スプレードライフッ化カリウム116g(アルドリッチ社製)及びジエチレングリコール800mlを仕込み、窒素雰囲気下に置いた。反応器をオイルバスに浸して、95℃で加熱後、製造例1の反応を繰り返して得られた粗メタンスルホニルオキイソブタン152gを滴下ロートから約3.5時間かけて添加した。その後、4時間撹拌を継続し、生成する低沸点の生成物をドライアイス/エタノール浴に浸漬した留分捕集受器に捕集した。その後、オイルバスの温度を80℃まで下げ、反応器にドライアイス-エタノール浴に浸したガラス製トラップを直列に2つ繋げた。さらに、ガラス製トラップの出口には圧力コントローラー、及び真空ポンプを繋げた。真空ポンプを起動し、圧力コントローラーを使って、系内の圧力を50~45kPa、次いで、35~30kPa、さらに、30~25kPaまで段階的に下げて、揮発成分をガラストラップに回収した。
留分捕集用受器、及び2つのガラス製トラップの中身を合わせて49g得られ、ガスクロマトグラフィーにて分析した結果、イソブテン11.85面積%、イソブチルフルオリド79.69面積%、ジイソプロピルエーテル7.32面積%、及び、高沸点成分1.14面積%を含む混合物であった。
回転子、滴下ロート、及びジムロート型コンデンサーを付した容量300mlのガラス製反応器に、乾燥t-ブタノール29g及び、1,1,2-トリクロロトリフルオロエタン120mlを入れ、氷水で冷却した。ジムロート型コンデンサーには0℃の冷媒を循環させた。内容物を撹拌させながら、滴下ロートから、ヘキサフルオロプロペン-ジエチルアミン錯体(東京化成工業社製)94gを約45分間かけて滴下した。滴下終了後、氷水で冷却したまま、さらに、2時間撹拌した。 その後、内容物をガスクロマトグラフィーにて分析した結果、原料のt-ブタノールは消失していた。
氷水を入れた分液ロート内に反応液を注ぎ込み、有機層を洗浄後、冷却した飽和重層水、氷水でさらに洗浄し、硫酸マグネシウムで乾燥させた。濾過後、有機層をガスクロマトグラフィーにて分析した結果、イソブテン1.44面積%、t-ブチルフルオリド23.86面積%、1,1,2-トリクロロ-トリフルオロエタン34.13面積%、N、N-ジエチル-2,3,3,3-テトラフルオロプロピオンアミド39.52面積%からなる混合物であった。
製造例1、及び2を繰り返して得られた、粗イソブチルフルオリド423gを蒸留釜に仕込み、KS型精留塔(東科精機社製、カラム長60cm、充填剤ヘリパックNo.1)を使って、蒸留を行った。コンデンサーには-20℃の冷媒を循環させ、約1時間全還流を行った。蒸留釜は塔頂部の温度、及び釜内部の残量を考慮しながら、45~70℃で加温した。全還流後、還流比45:1で留分の抜き出しを行った。その結果、99.941面積(容量)%のイソブチルフルオリドが247g得られ、不純物として、イソブテンが543面積(容量)ppm含まれていた。
1H-NMR(CDCl3,TMS)δ(ppm):1.03(t,3H×2)、1.97(m,1H)、4.41(m,2H)、4.45(m,2H)
19F-NMR(CDCl3、CFCl3)δ(ppm):-220(m,F)
モレキュラーシーブ3A(ユニオン昭和社製)100gを入れた、容量1.2LのSUS316製容器(内面:電解研磨処理)に、実施例1で蒸留精製されたイソブチルフルオリドを240g入れ、約25℃で22時間浸漬した。
その後、容量0.5LのSUS316製釜の上部に、ショートカラム及びコンデンサー、及び受器を取り付けた単蒸留装置を組み、コンデンサーには-10℃の冷却水を循環させた。釜に水分除去を行ったイソブチルフルオリド227gを仕込み、釜を40℃に加温した。この時のイソブチルフルオリド中の窒素及び酸素濃度をガスクロマトグラフィーにて測定したところ、それぞれ534容量ppm及び130容量ppmであった。仕込んだイソブチルフルオリドに対して、約30重量%を受器に抜出したところで、単蒸留を停止し、釜を25℃まで冷却した。釜内のイソブチルフルオリドを、ダイヤフラム式バルブを付した容量0.5Lのマンガン鋼製シリンダー(内面粗度:1S)148g充填した。イソブチルフルオリドの純度は99.947面積(容量)%、イソブテンの含有量は、414面積(容量)ppmであり、窒素、酸素、及び水分の含有量は、それぞれ67容量ppm、10容量ppm、及び12容量ppmであった。
製造例1、及び2の反応を繰り返して得られた粗イソブチルフルオリド387gを蒸留釜に仕込み、KS型精留塔(東科精機社製、カラム長:60cm、充填剤:ヘリパックNo.1)を使って、蒸留を行った。コンデンサーには-20℃の冷媒を循環させ、約1時間全還流を行った。蒸留釜は塔頂部の温度、及び釜内部の残量を考慮しながら、45から70℃まで加温した。全還流後、還流比30:1の間で留分の抜き出しを行った。その結果、99.913面積(容量)%のイソブチルフルオリドが213g得られ、不純物として、イソブテンが834面積(容量)ppm含まれていた。
実施例3で得られたイソブチルフルオリド210gを容量0.5Lのステンレス製容器内で、アルミナ(日揮触媒化成社製、製品名「N612N」)20gに20時間、25℃下で浸漬した。ステンレス容器と容量0.5Lのマンガン鋼製シリンダーをステンレスチューブで繋ぎ、孔径0.2μmの金属製フィルターを介して、減圧下にイソブチルフルオリドをシリンダー内に充填した。シリンダーを氷水で冷却し、圧力コントローラーを介して、5~10kPa圧力下、真空ポンプで減圧しながら、約20gのイソブチルフルオリドを抜いた。約25℃に戻し、暫く静置後、イソブチルフルオリド純度は、99.918面積(容量)%、イソブテンの含有量は、791面積(容量)ppmであり、窒素、酸素、及び水分の含有量は、それぞれ41容量ppm、13容量ppm、及び38容量ppmであった。
製造例3を繰り返して得られた、粗t-ブチルフルオリド423gを蒸留釜に仕込み、KS型精留塔(東科精機社製、カラム長60cm、充填剤ヘリパックNo.1)を使って、蒸留を行った。コンデンサーには-20℃の冷媒を循環させ、約1時間全還流を行った。蒸留釜は塔頂部の温度、及び釜内部の残量を考慮しながら、45~60℃で加温した。全還流後、還流比40:1で留分の抜き出しを行った。その結果、99.931面積(容量)%のt-ブチルフルオリドが247g得られ、不純物として、イソブテンが627面積(容量)ppm含まれていた。
1H-NMR(CDCl3,TMS)δ(ppm):1.26(d,3H×3)
19F-NMR(CDCl3、CFCl3)δ(ppm):-130(m,F)
モレキュラーシーブ3A(ユニオン昭和社製)25gを入れた、容量0.5LのSUS316製容器(内面:電解研磨処理)に、実施例5で蒸留精製されたt-ブチルフルオリドを240g入れ、約25℃で20時間浸漬した。
その後、容量0.5LのSUS316製釜の上部に、ショートカラム及びコンデンサー、及び受器を取り付けた単蒸留装置を組み、コンデンサーには-15℃の冷却水を循環させた。釜に水分除去を行ったt-ブチルフルオリド231gを仕込み、釜を30℃に加温した。この時のt-ブチルフルオリド中の窒素及び酸素濃度をガスクロマトグラフィーにて測定したところ、それぞれ710容量ppm及び266容量ppmであった。仕込んだt-ブチルフルオリドに対して、約35重量%を受器に抜出したところで、単蒸留を停止し、釜を約25℃まで冷却した。釜内のt-ブチルフルオリドを、ダイヤフラム式バルブを付した容量0.5Lのマンガン鋼製シリンダー(内面粗度:1S)144g充填した。t-ブチルフルオリド中のイソブテンの含有量は、596面積(容量)ppmであり、窒素、酸素、及び水分の含有量は、それぞれ72容量ppm、22容量ppm、及び16容量ppmであった。
製造例3の反応を繰り返して得られた粗t-ブチルフルオリド389gを蒸留釜に仕込み、KS型精留塔(東科精機社製、カラム長:60cm、充填剤:ヘリパックNo.1)を使って、蒸留を行った。コンデンサーには-20℃の冷媒を循環させ、約1時間全還流を行った。蒸留釜は塔頂部の温度、及び釜内部の残量を考慮しながら、45から60℃まで加温した。全還流後、還流比30:1の間で留分の抜き出しを行った。その結果、99.906面積(容量)%のt-ブチルフルオリドが198g得られ、不純物として、イソブテンが902面積(容量)ppm含まれていた。
実施例7で得られたt-ブチルフルオリド187gを容量0.5Lのステンレス製容器内で、モレキュラーシーブ(東ソー製、製品名「ゼオラム(登録商標)A-3」)18gに18時間、約25℃で浸漬した。ステンレス容器と容量0.5Lのマンガン鋼製シリンダーをステンレスチューブで繋ぎ、孔径0.2μmの金属製フィルターを介して、減圧下に、t-ブチルフルオリドをシリンダー内に充填した。シリンダーを氷水で冷却し、圧力コントローラーを介して、5~10kPa圧力下、真空ポンプで減圧しながら、約20gのt-ブチルフルオリドを抜いた。25℃に戻し、暫く静置後、t-ブチルフルオリド中のイソブテンの含有量は、889面積(容量)ppmであり、窒素、酸素、及び水分の含有量は、それぞれ66容量ppm、14容量ppm、及び39容量ppmであった。
製造例1及び2の反応を繰り返して得られた粗イソブチルフルオリド406gを蒸留釜に仕込み、KS型精留塔(東科精機社製、カラム長:60cm、充填剤:ヘリパックNo.1)を使って、蒸留を行った。コンデンサーには-20℃の冷媒を循環させ、約1時間全還流を行った。蒸留釜は塔頂部の温度、及び釜内部の残量を考慮しながら、45~70℃で加温した。全還流後、還流比10:1で留分の抜き出しを行った。その結果、99.872面積%のイソブチルフルオリドが235g得られ、不純物として、イソブテンが1189面積(容量)ppm含まれていた。その後、実施例4と同様の操作を行い、イソブチルフルオリド218gをシリンダーに充填した。イソブチルフルオリド中の窒素、酸素、及び水分含有量を測定したところ、それぞれ40容量ppm、13容量ppm、及び25容量ppmであった。
製造例3の反応を繰り返して得られた粗t-ブチルフルオリド393gを蒸留釜に仕込み、KS型精留塔(東科精機社製、カラム長:60cm、充填剤:ヘリパックNo.1)を使って、蒸留を行った。コンデンサーには-20℃の冷媒を循環させ、約1時間全還流を行った。蒸留釜は塔頂部の温度、及び釜内部の残量を考慮しながら、45~70℃で加温した。全還流後、還流比10:1で留分の抜き出しを行った。その結果、99.811面積%のt-ブチルフルオリドが225g得られ、不純物として、イソブテンが1690面積(容量)ppm含まれていた。その後、実施例6と同様の操作を行い、t-ブチルフルオリド203gをシリンダーに充填した。t-ブチルフルオリド中の窒素、酸素、及び水分含有量を測定したところ、それぞれ55容量ppm、11容量ppm、及び16容量ppmであった。
プラズマエッチング評価:表面に窒化シリコン膜が形成されたウェハと表面にシリコ酸化膜が形成されたウェハを用い、それぞれのウェハを、別々にエッチングを行った。そして、窒化シリコン膜及びシリコン酸化膜それぞれのエッチング速度を測定し、これらの測定結果に基づいてシリコン酸化膜に対する窒化シリコン膜のエッチング速度比から選択比(SiN膜/SiO2膜)を求めた。
平行平板型プラズマエッチング装置のエッチングチャンバー内に、表面に窒化シリコン膜が形成されたウェハと表面にシリコン酸化膜が形成されたウェハをそれぞれセットし、系内を真空にした後、実施例2で調製したイソブチルフルオリドを用いて、下記のエッチング条件下でエッチングを実施した。その結果、シリコン窒化膜のエッチング速度は、28nm/minであり、シリコン酸化膜はエッチングされなかった。このため、選択比(SiN膜/SiO2膜)は無限大であった。
混合ガスの圧力:6.7Pa
上部電極の高周波電源電力:200W
下部電極の高周波電源電力:100W
上部電極と下部電極の間隔:50mm
電極温度:20℃
ガス流量
O2ガス:60sccm
イソブチルフルオリド:45sccm
エッチング時間:180秒
[実施例10]
イソブチルフルオリドを実施例4で調製したものに変更したこと以外は実施例9と同様にしてエッチング評価を行った。その結果、シリコン窒化膜のエッチング速度は、25nm/minであり、シリコン酸化膜はエッチングされなかった。このため、選択比(SiN膜/SiO2膜)は無限大であった。
実施例9において、イソブチルフルオリドを実施例6で調製したt-ブチルフルオリドに変更したこと以外は以下の条件でエッチング評価を行った。その結果、シリコン窒化膜のエッチング速度は、30nm/minであり、シリコン酸化膜はエッチングされなかった。このため、選択比(SiN膜/SiO2膜)は無限大であった。
エッチング条件
混合ガスの圧力:6.7Pa
上部電極の高周波電源電力:200W
下部電極の高周波電源電力:100W
上部電極と下部電極の間隔:50mm
電極温度:20℃
ガス流量
O2ガス:60sccm
t-ブチルフルオリド:40sccm
エッチング時間:180秒
t-ブチルフルオリドを実施例8で調製したものに代えた以外は実施例11と同様にしてエッチング評価を行った。その結果、シリコン窒化膜のエッチング速度は、24nm/minであり、シリコン酸化膜はエッチングされなかった。このため、選択比(SiN膜/SiO2膜)は無限大であった。
イソブチルフルオリドを、参考例1で調製したものに変更したこと以外は実施例9と同様にしてエッチング評価を行ったが、シリコン窒化膜にデポジションが発生し、途中でエッチングが止まってしまった。もちろん、シリコン酸化膜はエッチングされなかった。
t-ブチルフルオリドを、参考例2で調製したものに変更したこと以外は実施例11と同様にしてエッチング評価を行ったが、シリコン窒化膜にデポジションが発生し、途中でエッチングが止まってしまった。もちろん、シリコン酸化膜はエッチングされなかった。
Claims (5)
- 純度が99.9容量%以上、ブテン類が合計で1000容量ppm以下であることを特徴とする、式:R-F(式中、Rは、イソブチル基又はt-ブチル基を表す。)で表されるフッ素化炭化水素。
- 窒素含有量が100容量ppmで、酸素含有量が50容量ppm以下である請求項1記載のフッ素化炭化水素。
- 水分含有量が50容量ppm以下である請求項1又は2記載のフッ素化炭化水素。
- 請求項1~3のいずれかに記載のフッ素化炭化水素のプラズマエッチングガスとしての使用。
- 請求項1~3のいずれかに記載のフッ素化炭化水素をプラズマエッチングガスとして用いて、シリコン又はシリコン酸化膜上に積層された無機窒化膜を選択的にプラズマエッチングするプラズマエッチング方法。
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US9984896B2 (en) | 2018-05-29 |
EP3064483A1 (en) | 2016-09-07 |
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