WO2022009553A1 - エッチング方法及び半導体素子の製造方法 - Google Patents
エッチング方法及び半導体素子の製造方法 Download PDFInfo
- Publication number
- WO2022009553A1 WO2022009553A1 PCT/JP2021/020221 JP2021020221W WO2022009553A1 WO 2022009553 A1 WO2022009553 A1 WO 2022009553A1 JP 2021020221 W JP2021020221 W JP 2021020221W WO 2022009553 A1 WO2022009553 A1 WO 2022009553A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- etching
- gas
- etched
- fluorine compound
- silicon nitride
- Prior art date
Links
- 238000005530 etching Methods 0.000 title claims abstract description 393
- 238000000034 method Methods 0.000 title claims abstract description 69
- 239000004065 semiconductor Substances 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000007789 gas Substances 0.000 claims abstract description 225
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 85
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 85
- 150000002222 fluorine compounds Chemical class 0.000 claims abstract description 74
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 56
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 42
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 40
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 32
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 30
- 229910003481 amorphous carbon Inorganic materials 0.000 claims description 28
- 239000000758 substrate Substances 0.000 claims description 21
- 229920002120 photoresistant polymer Polymers 0.000 claims description 17
- SYNPRNNJJLRHTI-UHFFFAOYSA-N 2-(hydroxymethyl)butane-1,4-diol Chemical compound OCCC(CO)CO SYNPRNNJJLRHTI-UHFFFAOYSA-N 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- RRKMWVISRMWBAL-UHFFFAOYSA-N 3,4-dihydroxy-5-methoxybenzaldehyde Chemical compound COC1=CC(C=O)=CC(O)=C1O RRKMWVISRMWBAL-UHFFFAOYSA-N 0.000 claims description 6
- PGFXOWRDDHCDTE-UHFFFAOYSA-N hexafluoropropylene oxide Chemical compound FC(F)(F)C1(F)OC1(F)F PGFXOWRDDHCDTE-UHFFFAOYSA-N 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052743 krypton Inorganic materials 0.000 claims description 4
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052754 neon Inorganic materials 0.000 claims description 4
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001020 plasma etching Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 235000012239 silicon dioxide Nutrition 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 6
- 229910018503 SF6 Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000009616 inductively coupled plasma Methods 0.000 description 6
- -1 perfluoro compounds Chemical class 0.000 description 6
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 6
- 229960000909 sulfur hexafluoride Drugs 0.000 description 6
- 238000010792 warming Methods 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 5
- 229910001882 dioxygen Inorganic materials 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000001272 nitrous oxide Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- JESXATFQYMPTNL-UHFFFAOYSA-N 2-ethenylphenol Chemical compound OC1=CC=CC=C1C=C JESXATFQYMPTNL-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- VBZWSGALLODQNC-UHFFFAOYSA-N hexafluoroacetone Chemical compound FC(F)(F)C(=O)C(F)(F)F VBZWSGALLODQNC-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 2
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- DCEPGADSNJKOJK-UHFFFAOYSA-N 2,2,2-trifluoroacetyl fluoride Chemical compound FC(=O)C(F)(F)F DCEPGADSNJKOJK-UHFFFAOYSA-N 0.000 description 1
- YLCLKCNTDGWDMD-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanoyl fluoride Chemical compound FC(=O)C(F)(F)C(F)(F)F YLCLKCNTDGWDMD-UHFFFAOYSA-N 0.000 description 1
- LOUICXNAWQPGSU-UHFFFAOYSA-N 2,2,3,3-tetrafluorooxirane Chemical compound FC1(F)OC1(F)F LOUICXNAWQPGSU-UHFFFAOYSA-N 0.000 description 1
- DQWRXSPZQZNYRX-UHFFFAOYSA-N 2,2,3,3-tetrafluoropropanoyl fluoride Chemical compound FC(F)C(F)(F)C(F)=O DQWRXSPZQZNYRX-UHFFFAOYSA-N 0.000 description 1
- DZXSTVONXZVOKT-UHFFFAOYSA-N 2,2,3-trifluoropropanoyl fluoride Chemical compound FCC(F)(F)C(F)=O DZXSTVONXZVOKT-UHFFFAOYSA-N 0.000 description 1
- CRLSHTZUJTXOEL-UHFFFAOYSA-N 2,2-difluoroacetyl fluoride Chemical compound FC(F)C(F)=O CRLSHTZUJTXOEL-UHFFFAOYSA-N 0.000 description 1
- QHTDUXIUTIYGHB-UHFFFAOYSA-N 2,2-difluoropropanoyl fluoride Chemical compound CC(F)(F)C(F)=O QHTDUXIUTIYGHB-UHFFFAOYSA-N 0.000 description 1
- OVCHOVMROGWUGQ-UHFFFAOYSA-N 2,3,3,3-tetrafluoropropanoyl fluoride Chemical compound FC(=O)C(F)C(F)(F)F OVCHOVMROGWUGQ-UHFFFAOYSA-N 0.000 description 1
- FOZAZWTVWXFATO-UHFFFAOYSA-N 2,3,3-trifluoropropanoyl fluoride Chemical compound FC(F)C(F)C(F)=O FOZAZWTVWXFATO-UHFFFAOYSA-N 0.000 description 1
- RDUXEUYBMYIKTP-UHFFFAOYSA-N 2,3-difluoropropanoyl fluoride Chemical compound FCC(F)C(F)=O RDUXEUYBMYIKTP-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- LPGXUEOAYSYXNJ-UHFFFAOYSA-N 2-fluoroacetyl fluoride Chemical compound FCC(F)=O LPGXUEOAYSYXNJ-UHFFFAOYSA-N 0.000 description 1
- INGFLBLMEBWCNV-UHFFFAOYSA-N 2-fluoropropanoyl fluoride Chemical compound CC(F)C(F)=O INGFLBLMEBWCNV-UHFFFAOYSA-N 0.000 description 1
- VXZNUWALAXEDSJ-UHFFFAOYSA-N 3,3,3-trifluoropropanoyl fluoride Chemical compound FC(=O)CC(F)(F)F VXZNUWALAXEDSJ-UHFFFAOYSA-N 0.000 description 1
- ZXTVKCRUSMAUTC-UHFFFAOYSA-N 3,3-difluoropropanoyl fluoride Chemical compound C(C(F)F)C(=O)F ZXTVKCRUSMAUTC-UHFFFAOYSA-N 0.000 description 1
- TYSOVZSWRVQDTB-UHFFFAOYSA-N 3-fluoropropanoyl fluoride Chemical compound FCCC(F)=O TYSOVZSWRVQDTB-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- AOMUALOCHQKUCD-UHFFFAOYSA-N dodecyl 4-chloro-3-[[3-(4-methoxyphenyl)-3-oxopropanoyl]amino]benzoate Chemical compound CCCCCCCCCCCCOC(=O)C1=CC=C(Cl)C(NC(=O)CC(=O)C=2C=CC(OC)=CC=2)=C1 AOMUALOCHQKUCD-UHFFFAOYSA-N 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- NHGVZTMBVDFPHJ-UHFFFAOYSA-N formyl fluoride Chemical compound FC=O NHGVZTMBVDFPHJ-UHFFFAOYSA-N 0.000 description 1
- 125000002485 formyl group Chemical group [H]C(*)=O 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920013653 perfluoroalkoxyethylene Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- WMFABESKCHGSRC-UHFFFAOYSA-N propanoyl fluoride Chemical compound CCC(F)=O WMFABESKCHGSRC-UHFFFAOYSA-N 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- WZEOZJQLTRFNCU-UHFFFAOYSA-N trifluoro(trifluoromethoxy)methane Chemical compound FC(F)(F)OC(F)(F)F WZEOZJQLTRFNCU-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—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
-
- 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
- H01L21/3105—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
-
- 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
-
- 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
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
- H01J37/32816—Pressure
-
- 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
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
- H01J2237/3343—Problems associated with etching
- H01J2237/3346—Selectivity
Definitions
- etching gas is a mixed gas containing an oxygen-containing gas other than the fluorine compound in addition to the fluorine compound, a rare gas, and a nitrogen gas.
- fluorine compound is at least one selected from carbonyl fluoride, oxalyl fluoride, and hexafluoropropylene oxide.
- the etching target can be selectively etched as compared with the non-etching target.
- the etching target having silicon nitride is selectively selected without using the gas of a perfluoro compound such as carbon tetrafluoride and sulfur hexafluoride having a high global warming potential. Can be etched into. Therefore, the etching method according to the present embodiment can reduce the environmental load due to the use of the etching gas and suppress the adverse effect on global warming.
- a perfluoro compound such as carbon tetrafluoride and sulfur hexafluoride having a high global warming potential.
- the etching in the present invention means that the member to be etched is processed into a predetermined shape (for example, a three-dimensional shape) by removing a part or all of the object to be etched (for example, the member to be etched). It means that the film-like etching target made of silicon nitride has a predetermined thickness), and also means that the residue and deposits made of the etching target are removed from the member to be etched and cleaned. do.
- the etching method according to this embodiment can be used for manufacturing a semiconductor element. That is, the method for manufacturing a semiconductor element according to the present embodiment is a method for manufacturing a semiconductor element for manufacturing a semiconductor element by using the etching method according to the present embodiment, and the member to be etched is an object to be etched and a non-etched object. It is a semiconductor substrate having an object, and includes a processing step of removing at least a part of the object to be etched from the semiconductor substrate by etching.
- the etching proceeds more rapidly with silicon nitride (for example, Si 3 N 4 ) than with silicon oxide (for example, SiO 2).
- silicon nitride for example, Si 3 N 4
- silicon oxide for example, SiO 2.
- the silicon nitride film exposed on the inner surface of the through hole is selectively and isotropically etched, so that the end portion of the silicon oxide film protrudes into the through hole. Can be formed.
- the structure can be used as a structure of a semiconductor element, it is used for manufacturing a semiconductor element such as a 3D-NAND flash memory and a logic device. ..
- the process of forming the above structure by etching has conventionally been performed using a chemical solution containing phosphoric acid or the like, but etching using an etching gas is superior in fine processability to etching using a chemical solution. Therefore, the etching method according to the present embodiment can be expected to contribute to further miniaturization and high integration of semiconductor devices.
- the non-etching object itself is used as the structure of the semiconductor device
- a material that does not substantially react with the fluorine compound or a material that reacts extremely slowly with the fluorine compound is used as the non-etching object.
- at least one material selected from silicon oxide (for example, SiO 2 ), photoresist, and amorphous carbon (C) can be used.
- the etching of this embodiment can be achieved by plasma etching.
- the type of plasma source in plasma etching is not particularly limited, and a commercially available device may be used.
- high-frequency discharge plasma such as inductively coupled plasma (ICP: Inductively Coupled Plasma), capacitively coupled plasma (CCP: Capacitively Coupled Plasma), electron cyclotron resonance plasma (ECRP: Electron Cyclotron Plasma), etc. Will be.
- plasma may be generated in the plasma generation chamber separately from the plasma generation chamber and the chamber in which the member to be etched is installed (that is, remote plasma may be used).
- remote plasma may be used.
- remote plasma By etching using remote plasma, it may be possible to etch an object to be etched having silicon nitride with high selectivity.
- the etching method in which etching is performed inside the chamber by the plasma of the etching gas generated outside the chamber by the plasma generation source may be referred to as "remote plasma etching".
- the etching gas is a gas containing a fluorine compound having 3 or less carbon atoms and having at least one of a carbon-oxygen double bond and an ether bond in the molecule.
- the ether bond (—O—) may be a cyclic ether bond.
- the type of the fluorine compound is not particularly limited as long as it meets the above requirements, but for example, formyl fluoride, carbonyl fluoride, oxalyl fluoride, 2,2,2-trifluoroacetylfluoride, 2, 2-Difluoroacetylfluoride, 2-fluoroacetylfluoride, acetylfluoride, 2,2,3,3,3-pentafluoropropanoylfluoride, 2,2,3,3-tetrafluoropropanoylfluoride , 2,3,3,3-tetrafluoropropanoylfluoride, 3,3,3-trifluoropropanoylfluoride, 2,3,3-trifluoropropanoylfluoride, 2,2,3-trifluoro Propanoyl fluoride, 2,2-difluoropropanoyl fluoride, 2,3-difluoropropanoyl fluoride, 3,3-difluoro
- the etching target having silicon nitride can be selectively etched as compared with the non-etching target.
- the etching selection ratio which is the ratio of the etching rate of the non-etching object to the etching rate of the etching object, tends to be 5 or more.
- the etching selectivity is preferably 5 or more, more preferably 7 or more, and even more preferably 10 or more.
- An inert diluted gas can be used as another kind of gas that constitutes the etching gas together with the gas of the fluorine compound. That is, the etching gas can be a mixed gas containing a fluorine compound and a diluting gas.
- the diluting gas at least one selected from nitrogen gas (N 2 ), helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe) can be used.
- the etching gas contains a small amount of nitrogen gas, that is, if the etching gas is a mixed gas containing a fluorine compound, a rare gas, and a nitrogen gas, the etching rate of silicon nitride may be improved.
- the concentration of nitrogen gas in the etching gas is, for example, preferably 10% by volume or less, more preferably 5% by volume or less, still more preferably 3% by volume or less.
- the noble gas is at least one selected from helium, neon, argon, krypton, and xenon.
- the etching gas contains a rare gas and a small amount of nitrogen gas
- the oxygen-containing gas is a compound that is a gas in a standard state, and is a compound that has an oxygen atom in the molecule other than the above-mentioned fluorine compound.
- oxygen-containing gases include oxygen gas (O 2 ), ozone (O 3 ), nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrous oxide (N 2 O), and sulfur dioxide (SO 2 ).
- the volume ratio of oxygen-containing gas (oxygen-containing gas / nitrogen gas) to nitrogen gas in the etching gas is preferably 0.1 or more and 2 or less, more preferably 0.15 or more and 1 or less, and 0.2 or more and 0.6 or less. Is even more preferable.
- the volume ratio of the nitrogen gas to the oxygen-containing gas is within the above range, the effect of improving the etching rate of silicon nitride and the effect of improving the etching selection ratio can be easily obtained.
- the pressure condition of the etching step in the etching method according to the present embodiment is not particularly limited, but is preferably 1 Pa or more and 3 kPa or less, more preferably 3 Pa or more and 2 kPa or less, and 10 Pa or more and 1.5 kPa or less. Is more preferable. When the pressure condition is within the above range, plasma is likely to be stably generated.
- a member to be etched can be arranged in the chamber and etching can be performed while the etching gas is circulated in the chamber, but the pressure in the chamber when the etching gas is circulated can be 1 Pa or more and 3 kPa or less.
- the flow rate of the etching gas may be appropriately set so that the pressure in the chamber is kept constant according to the size of the chamber and the capacity of the exhaust equipment for depressurizing the inside of the chamber.
- the temperature condition of the etching step in the etching method according to the present embodiment is not particularly limited, but is preferably 0 ° C. or higher and 200 ° C. or lower, more preferably 5 ° C. or higher and 170 ° C. or lower, and 20 ° C. or higher. It is more preferable that the temperature is 150 ° C. or lower.
- the temperature condition is within the above range, the fluorine compound can be present in a gaseous state, and the etching rate of silicon nitride tends to be higher.
- the temperature of the temperature condition is the temperature of the member to be etched, but the temperature of the stage that supports the member to be etched, which is installed in the chamber of the etching apparatus, can also be used.
- Fluorine compounds hardly react with non-etching objects such as silicon oxide, photoresist, and amorphous carbon at a temperature of 200 ° C or lower. Therefore, if the member to be etched is etched by the etching method according to the present embodiment, it is possible to selectively etch the object to be etched having silicon nitride with almost no etching of the non-etched object. Therefore, the etching method according to the present embodiment can be used as a method of processing an etching target having silicon nitride into a predetermined shape by using a patterned non-etching target as a resist or a mask.
- the etching selectivity tends to be high.
- the etching selection ratio which is the ratio of the etching rate of the etching target having silicon nitride to the etching rate of the non-etching target, tends to be 5 or more.
- the member to be etched by the etching method according to the present embodiment has an etching target and a non-etching target, but has a portion formed by the etching target and a portion formed by the non-etching target. It may be a member or a member formed of a mixture of an etching target and a non-etching target. Further, the member to be etched may have a member other than the object to be etched and the object to be etched.
- the shape of the member to be etched is not particularly limited, and may be, for example, plate-shaped, foil-shaped, film-shaped, powder-shaped, or lump-shaped. Examples of the member to be etched include the above-mentioned semiconductor substrate.
- the object to be etched has silicon nitride, but may be formed only of silicon nitride, or may have a portion formed only of silicon nitride and a portion formed of another material. It may be present, or it may be formed of a mixture of silicon nitride and other materials.
- Silicon nitride refers to a compound having silicon and nitrogen in arbitrary proportions, and examples thereof include Si 3 N 4 .
- the purity of silicon nitride is not particularly limited, but is preferably 30% by mass or more, more preferably 60% by mass or more, and further preferably 90% by mass or more.
- the shape of the object to be etched is not particularly limited, and may be, for example, plate-shaped, foil-shaped, film-shaped, powder-shaped, or lump-shaped.
- Non-etched object Since the non-etching object does not substantially react with the fluorine compound or reacts with the fluorine compound extremely slowly, the etching hardly progresses even if the etching is performed by the etching method according to the present embodiment. ..
- the non-etching object is not particularly limited as long as it has the above-mentioned properties, but for example, silicon oxide, photoresist, amorphous carbon, titanium nitride, metals such as copper, nickel, and cobalt, and the like. Examples include metal oxides and nitrides. Among these, silicon oxide, photoresist and amorphous carbon are more preferable from the viewpoint of handleability and availability.
- Photoresist means a photosensitive composition whose physical properties such as solubility are changed by light, electron beam, or the like.
- photoresists for g-line, h-line, i-line, KrF, ArF, F2, EUV and the like can be mentioned.
- the composition of the photoresist is not particularly limited as long as it is generally used in the semiconductor manufacturing process, and for example, chain olefin, cyclic olefin, styrene, vinylphenol, acrylic acid, methacrylate, epoxy, etc. Examples thereof include compositions containing a polymer synthesized from at least one monomer selected from melamine and glycol.
- the non-etching object can be used as a resist or a mask for suppressing the etching of the etching object by the etching gas. Therefore, in the etching method according to the present embodiment, the patterned non-etched object is used as a resist or a mask to process the etched object into a predetermined shape (for example, the film-shaped etching object of the member to be etched). Since it can be used for a method such as (processing an object to a predetermined film thickness), it can be suitably used for manufacturing a semiconductor element. Further, since the non-etched object is hardly etched, it is possible to suppress the etching of the portion of the semiconductor element that should not be etched, and it is possible to prevent the characteristics of the semiconductor element from being lost by etching. can.
- the non-etching object remaining after patterning can be removed by a removal method generally used in the semiconductor device manufacturing process. For example, ashing with an oxidizing gas such as oxygen plasma or ozone, or dissolution using a chemical solution such as APM (mixed solution of ammonia water and hydrogen peroxide solution), SPM (mixed solution of sulfuric acid and hydrogen peroxide solution) or organic solvent. Removal is mentioned.
- ashing with an oxidizing gas such as oxygen plasma or ozone
- a chemical solution such as APM (mixed solution of ammonia water and hydrogen peroxide solution), SPM (mixed solution of sulfuric acid and hydrogen peroxide solution) or organic solvent. Removal is mentioned.
- the etching apparatus of FIG. 1 is a remote plasma etching apparatus that performs remote plasma etching. First, the etching apparatus of FIG. 1 will be described.
- the etching apparatus of FIG. 1 includes a chamber 10 in which etching is performed internally, a remote plasma generator 20 which is a plasma generation source, a stage 11 which supports the member to be etched 12 to be etched inside the chamber 10, and a member to be etched.
- a thermometer 14 for measuring the temperature of the chamber 12 an exhaust pipe 13 for discharging the gas inside the chamber 10, a vacuum pump 15 provided in the exhaust pipe 13 for depressurizing the inside of the chamber 10, and a chamber 10. It is equipped with a pressure gauge 16 for measuring the internal pressure.
- the etching apparatus of FIG. 1 is provided with an etching gas supply unit that supplies the etching gas inside the chamber 10.
- the etching gas supply unit includes a fluorine compound gas supply unit 1 that supplies a fluorine compound gas, a rare gas supply unit 2 that supplies a rare gas, a nitrogen gas supply unit 3 that supplies nitrogen gas, and a fluorine compound gas supply unit.
- a nitrogen gas supply pipe 9 for connecting the nitrogen gas supply unit 3 is provided in the middle portion of the above.
- the etching apparatus of FIG. 1 has a remote plasma generator 20 outside the chamber 10. More specifically, the etching apparatus of FIG. 1 has a remote plasma generator 20 at a position between the connection portion of the fluorine compound gas supply pipe 7 with the rare gas supply pipe 8 and the chamber 10.
- the fluorine compound gas supply pipe 7 is provided with a fluorine compound gas pressure control device 17 for controlling the pressure of the fluorine compound gas and a fluorine compound gas flow rate control device 4 for controlling the flow rate of the fluorine compound gas.
- the rare gas supply pipe 8 is provided with a rare gas pressure control device 18 for controlling the pressure of the rare gas and a rare gas flow rate control device 5 for controlling the flow rate of the rare gas.
- the nitrogen gas supply pipe 9 is provided with a nitrogen gas pressure control device 19 for controlling the pressure of the nitrogen gas and a nitrogen gas flow rate control device 6 for controlling the flow rate of the nitrogen gas.
- the fluorine compound gas supply pipe 7 is sent out from the fluorine compound gas supply unit 1 to the fluorine compound gas supply pipe 7.
- the gas of the fluorine compound is supplied to the remote plasma generator 20 via the remote plasma generator 20.
- the fluorine compound gas is sent from the fluorine compound gas supply unit 1 to the fluorine compound gas supply pipe 7, and the rare gas is supplied.
- the fluorine compound gas For supplying a fluorine compound gas by sending out the rare gas and the nitrogen gas from the supply unit 2 and the nitrogen gas supply unit 3 to the fluorine compound gas supply pipe 7 via the rare gas supply pipe 8 and the nitrogen gas supply pipe 9, respectively.
- the mixed gas is supplied to the remote plasma generator 20 via the pipe 7.
- the gas of the fluorine compound or the mixed gas is turned into plasma in the remote plasma generator 20 and supplied to the inside of the chamber 10.
- the remote plasma generator 20 and the chamber 10 may be directly connected or may be connected by piping.
- the configuration of the fluorine compound gas supply unit 1, the rare gas supply unit 2, and the nitrogen gas supply unit 3 is not particularly limited, and may be, for example, a cylinder or a cylinder. Further, as the fluorine compound gas flow rate control device 4, the rare gas flow rate control device 5, and the nitrogen gas flow rate control device 6, for example, a mass flow controller or a flow meter can be used.
- the etching gas When supplying the etching gas to the chamber 10, it is preferable to supply the etching gas while maintaining the pressure of the etching gas (that is, the value of the fluorine compound gas pressure control device 17 in FIG. 1) at a predetermined value. That is, the supply pressure of the etching gas is preferably 1 Pa or more and 0.2 MPa or less, more preferably 10 Pa or more and 0.1 MPa or less, and further preferably 50 Pa or more and 50 kPa or less. When the supply pressure of the etching gas is within the above range, the etching gas is smoothly supplied to the chamber 10, and the load on the parts (for example, the various devices and the piping) of the etching device of FIG. 1 is small. ..
- the pressure of the etching gas supplied into the chamber 10 is preferably 1 Pa or more and 80 kPa or less, and more preferably 10 Pa or more and 50 kPa or less, from the viewpoint of uniformly etching the surface of the member 12 to be etched. , 100 Pa or more and 20 kPa or less is more preferable.
- the pressure of the etching gas in the chamber 10 is within the above range, a sufficient etching rate can be obtained and the etching selection ratio tends to be high.
- the pressure in the chamber 10 before supplying the etching gas is not particularly limited as long as it is equal to or lower than the supply pressure of the etching gas or lower than the supply pressure of the etching gas, but is not particularly limited, but is, for example, 10 -5 Pa or more. It is preferably less than 10 kPa, and more preferably 1 Pa or more and 2 kPa or less.
- the differential pressure between the etching gas supply pressure and the pressure in the chamber 10 before the etching gas is supplied is preferably 0.5 MPa or less, more preferably 0.3 MPa or less, and 0.1 MPa or less. Is more preferable. When the differential pressure is within the above range, the etching gas can be smoothly supplied to the chamber 10.
- the etching processing time (hereinafter, also referred to as "etching time”) can be arbitrarily set depending on how much the object to be etched of the member 12 to be etched is desired to be etched, but the production efficiency of the semiconductor device manufacturing process is taken into consideration. Then, it is preferably within 60 minutes, more preferably within 40 minutes, and even more preferably within 20 minutes.
- the etching processing time refers to the time during which the plasma-ized etching gas is brought into contact with the member 12 to be etched inside the chamber 10.
- the etching method according to the present embodiment can be performed using a general plasma etching apparatus used in the semiconductor device manufacturing process, such as the etching apparatus of FIG. 1, and the configuration of the etchable apparatus that can be used is particularly limited. Not done.
- the positional relationship between the fluorine compound gas supply pipe 7 and the member 12 to be etched is not particularly limited as long as the etching gas can be brought into contact with the member 12 to be etched.
- the temperature control mechanism of the chamber 10 since the temperature of the member 12 to be etched may be adjusted to an arbitrary temperature, the temperature control mechanism may be directly provided on the stage 11 or an external temperature controller.
- the chamber 10 may be heated or cooled from the outside of the chamber 10.
- the material of the etching apparatus shown in FIG. 1 is not particularly limited as long as it has corrosion resistance to the fluorine compound used and can reduce the pressure to a predetermined pressure.
- a metal such as nickel, nickel-based alloy, aluminum, stainless steel, platinum, copper, or cobalt, a ceramic such as alumina, a fluororesin, or the like can be used for the portion in contact with the etching gas.
- nickel-based alloys include Inconel (registered trademark), Hastelloy (registered trademark), Monel (registered trademark) and the like.
- fluororesin include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene / perfluoroalkoxyethylene copolymer (PFA), polyvinylidene fluoride (PVDF), and Teflon.
- PTFE polytetrafluoroethylene
- PCTFE polychlorotrifluoroethylene
- PFA tetrafluoroethylene / perfluoroalkoxyethylene copolymer
- PVDF polyvinylidene fluoride
- Teflon Teflon
- Example 1 The member to be etched was etched using an etching apparatus having substantially the same configuration as the etching apparatus of FIG. 1.
- the member to be etched used in the first embodiment will be described with reference to FIG.
- a silicon nitride film 22 having a thickness of 1 ⁇ m formed on a square silicon substrate 21 having a side of 2 inches was prepared, and the dimensions were measured on the silicon nitride film 22.
- a 1-inch x 2-inch rectangular silicon dioxide substrate 23 was bonded using grease (Demnum Grease L-200 manufactured by Daikin Industries, Ltd.), and the laminate thus produced was used as a member to be etched. .. As shown in FIG. 2, the silicon dioxide substrate 23 was adhered so as to cover substantially half of the silicon nitride film 22.
- the silicon nitride film 22 is an etching target, and the silicon dioxide substrate 23, which is a non-etching target, is used as a resist.
- a contrasting laminate was prepared in which the silicon nitride film 22 to be etched was replaced with a film of silicon dioxide, a photoresist, or an amorphous carbon which is a non-etched object. did.
- the member to be etched and the three contrasting laminates were placed side by side on a stage inside the chamber of the etching apparatus, and the temperature of the stage was set to 20 ° C.
- a carbonyl fluoride carbonyl gas having a flow rate of 30 mL / min and an argon having a flow rate of 970 mL / min were mixed to form a mixed gas, and this mixed gas was used as an etching gas.
- this etching gas was supplied to the inside of the chamber at a flow rate of 1000 mL / min and circulated for 3 minutes for remote plasma etching.
- the pressure inside the chamber during the flow of the etching gas was set to 500 Pa.
- an intelligent remote plasma source ASTRON Paragon manufactured by Japan MKS Co., Ltd. was used, and the source power was set to 100 W.
- the exposed portion of the silicon nitride film 22 of the member to be etched that was not covered by the silicon dioxide substrate 23 was etched.
- the inside of the chamber was replaced with argon.
- the conditions for measuring the size of the step with an atomic force microscope are as follows. Measured pressure: atmospheric pressure (101.3 kPa) Measurement temperature: 28 ° C Measurement atmosphere: Atmosphere Scanning range: Width 80.0 ⁇ m, height 20.0 ⁇ m, angle 0 °
- the etching target is a silicon nitride film
- the non-etching target is silicon dioxide, photoresist, and amorphous carbon
- the etching conditions etching gas composition, stage temperature, chamber pressure, etching time, remote plasma.
- the source power of the generator was set as shown in Table 1, and remote plasma etching was performed in the same manner as in Example 1.
- the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values.
- the results are shown in Tables 1 and 2.
- Example 1 The same as in Example 1 except that the etching gas is a mixed gas of sulfur hexafluoride gas and argon, the source power of the remote plasma generator is 400 W, and the etching time is 1 minute. Remote plasma etching was performed. Then, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 2.
- the etching gas was a mixed gas of carbonyl fluoride gas with a flow rate of 300 mL / min and argon with a flow rate of 700 mL / min, the stage temperature was set to 150 ° C, and the source power of the remote plasma generator was set to 0 W ( That is, plasma was not generated), and etching was performed in the same manner as in Example 1 except that the etching time was 30 minutes. Then, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 2.
- Example 3 Remote as in Example 1 except that the etching gas is a mixed gas of fluorinated carbonyl gas with a flow rate of 800 mL / min and argon with a flow rate of 200 mL / min and the source power of the remote plasma generator is 400 W. Plasma etching was performed. Then, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 2.
- the etching gas is a mixed gas of fluorinated carbonyl gas with a flow rate of 800 mL / min and argon with a flow rate of 200 mL / min and the source power of the remote plasma generator is 400 W. Plasma etching was performed. Then, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 2.
- Example 16 to 27 Using the ICP etching device RIE-200iP manufactured by Samco Co., Ltd., a plasma of etching gas is generated in the chamber, and the etching is performed in the chamber by the plasma of the etching gas.
- a plasma of etching gas is generated in the chamber, and the etching is performed in the chamber by the plasma of the etching gas.
- the composition of the gas, the temperature of the stage, the pressure in the chamber, the etching time, the source power and the bias power of the plasma generator are as shown in Table 3.
- Etching was performed on the laminate. Then, in the same manner as in Example 1, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 3.
- Plasma etching was performed in the same manner as in Example 16 except that the etching gas was a mixed gas of sulfur hexafluoride gas and argon and the bias power of the plasma generator was 80 W. Then, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 3.
- Plasma etching was performed in the same manner as in Example 16 except that the etching gas was a mixed gas of carbonyl fluoride gas having a flow rate of 40 mL / min and argon having a flow rate of 10 mL / min. Then, the etching rates of the etching target and the non-etching target were calculated, respectively, and the etching selection ratio was calculated from the numerical values. The results are shown in Table 3.
- the silicon nitride film 32 and the silicon oxide film 33 are the objects to be etched, and the amorphous carbon film 35 is the object to be etched.
- the member to be etched in FIG. 3 has a through hole 34 having a diameter of 100 nm that penetrates the 30-layer silicon nitride film 32, the 30-layer silicon oxide film 33, and the 1-layer amorphous carbon film 35 in the stacking direction. ..
- the chamber was opened and the member to be etched was taken out.
- the portion of the silicon nitride film 32 exposed on the inner surface of the through hole 34 is etched, and the silicon nitride film 32 is preferentially etched as compared with the silicon oxide film 33. A part of the inner surface of 34 was spread outward in the radial direction.
- the inner surface of the through hole 34 expands radially outward due to etching, and the radius of the through hole 34 becomes large, and the difference in the radius was measured. Then, by dividing it by the etching time, the relative etching rates of silicon nitride and silicon oxide with respect to amorphous carbon were calculated. The etching rate of amorphous carbon was calculated by comparing the diameters of the through holes 34 before and after etching, but almost no change in diameter was observed.
- the average value and the standard deviation of the etching rates of the 30-layer silicon nitride film 32 and the silicon oxide film 33 are calculated, and the relative etching rate in the in-plane direction (direction parallel to the surface of the film) is the stacking of the films.
- the uniformity of the relative etching rate was evaluated as to whether or not it changed depending on the directional position. The results are shown in Table 4.
- Examples 32 to 35 The same member to be etched as in Example 28 was etched using an ICP etching apparatus RIE-200iP manufactured by SAMCO Corporation.
- the bias power of the plasma generator is 0 W
- other etching conditions etching gas composition, stage temperature, chamber pressure, etching time, source power of the plasma generator
- Table 5 etching conditions
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- Drying Of Semiconductors (AREA)
- Weting (AREA)
Abstract
Description
本発明は、窒化ケイ素を有するエッチング対象物を非エッチング対象物に比べて選択的にエッチングすることができるエッチング方法及び半導体素子の製造方法を提供することを課題とする。
[1] 炭素-酸素二重結合及びエーテル結合の少なくとも一方の結合を分子内に有する炭素数3以下のフッ素化合物を含有するエッチングガスを、前記エッチングガスによるエッチングの対象であるエッチング対象物と前記エッチングガスによるエッチングの対象ではない非エッチング対象物とを有する被エッチング部材に、プラズマの存在下で接触させ、前記非エッチング対象物に比べて前記エッチング対象物を選択的にエッチングするエッチング工程を備え、
前記エッチングガス中の前記フッ素化合物の濃度が0.5体積%以上40体積%以下であり、前記エッチング対象物が窒化ケイ素を有するエッチング方法。
[3] 前記エッチング工程を1Pa以上3kPa以下の圧力条件で行う[1]又は[2]に記載のエッチング方法。
[5] 前記エッチングガス中の前記フッ素化合物の濃度が1体積%以上30体積%以下である[1]~[4]のいずれか一項に記載のエッチング方法。
[7] 前記希釈ガスが、窒素ガス、ヘリウム、アルゴン、ネオン、クリプトン、及びキセノンから選ばれる少なくとも一種である[6]に記載のエッチング方法。
[8] 前記エッチングガスが、前記フッ素化合物と希ガスと窒素ガスを含有する混合ガスであり、前記エッチングガス中の前記窒素ガスの濃度が10体積%以下である[1]~[5]のいずれか一項に記載のエッチング方法。
[10] 前記フッ素化合物が、フッ化カルボニル、フッ化オキサリル、及びヘキサフルオロプロピレンオキシドから選ばれる少なくとも一種である[1]~[9]のいずれか一項に記載のエッチング方法。
前記被エッチング部材が、前記エッチング対象物及び前記非エッチング対象物を有する半導体基板であり、
前記半導体基板から前記エッチング対象物の少なくとも一部を前記エッチングにより除去する処理工程を備える半導体素子の製造方法。
本実施形態のエッチングは、プラズマエッチングによって達成できる。プラズマエッチングにおけるプラズマ源の種類は特に限定されるものではなく、市販されている装置を用いればよい。例えば、誘導結合プラズマ(ICP:Inductively Coupled Plasma)、容量結合プラズマ(CCP:Capacitively Coupled Plasma)等の高周波放電プラズマや、電子サイクロトロン共鳴プラズマ(ECRP:Electron Cyclotron Resonance Plasma)等のマイクロ波放電プラズマが挙げられる。
エッチングガスは、炭素-酸素二重結合及びエーテル結合の少なくとも一方の結合を分子内に有する炭素数3以下のフッ素化合物を含有するガスである。炭素-酸素二重結合を有する官能基としては、カルボニル基(-(C=O)-)、ホルミル基(-(C=O)H)が挙げられる。エーテル結合(-O-)は、環状エーテル結合であってもよい。フッ素化合物の種類は、前記要件を満たしていれば特に限定されるものではないが、例えば、フッ化ホルミル、フッ化カルボニル、フッ化オキサリル、2,2,2-トリフルオロアセチルフルオリド、2,2-ジフルオロアセチルフルオリド、2-フルオロアセチルフルオリド、アセチルフルオリド、2,2,3,3,3-ペンタフルオロプロパノイルフルオリド、2,2,3,3,-テトラフルオロプロパノイルフルオリド、2,3,3,3-テトラフルオロプロパノイルフルオリド、3,3,3-トリフルオロプロパノイルフルオリド、2,3,3-トリフルオロプロパノイルフルオリド、2,2,3-トリフルオロプロパノイルフルオリド、2,2-ジフルオロプロパノイルフルオリド、2,3-ジフルオロプロパノイルフルオリド、3,3-ジフルオロプロパノイルフルオリド、2-フルオロプロパノイルフルオリド、3-フルオロプロパノイルフルオリド、プロパノイルフルオリド、パーフルオロイソプロパノイルフルオリド、ヘキサフルオロアセトン、ヘキサフルオロプロピレンオキシド、テトラフルオロエチレンオキシド、トリフルオロメチルエーテルなどが挙げられる。これらのフッ素化合物は1種類を単独で用いてもよいし、2種類以上を併用してもよい。これらのフッ素化合物の中でも、取扱性及び入手容易性の観点から、フッ化カルボニル(COF2)、フッ化オキサリル((COF)2)、ヘキサフルオロプロピレンオキシド(C3F6O)から選ばれる少なくとも一種がより好ましい。なお、炭素-酸素二重結合及びエーテル結合の少なくとも一方の結合を分子内に有する炭素数4以上のフッ素化合物の多くは、揮発性が低く、エッチングガスとしての取り扱いが困難になるため好ましくない。
希釈ガスとしては、窒素ガス(N2)、ヘリウム(He)、ネオン(Ne)、アルゴン(Ar)、クリプトン(Kr)、及びキセノン(Xe)から選ばれる少なくとも一種を用いることができる。
本実施形態に係るエッチング方法におけるエッチング工程の圧力条件は特に限定されるものではないが、1Pa以上3kPa以下とすることが好ましく、3Pa以上2kPa以下とすることがより好ましく、10Pa以上1.5kPa以下とすることがさらに好ましい。圧力条件が上記の範囲内であれば、プラズマを安定して発生させやすい。
本実施形態に係るエッチング方法におけるエッチング工程の温度条件は特に限定されるものではないが、0℃以上200℃以下とすることが好ましく、5℃以上170℃以下とすることがより好ましく、20℃以上150℃以下とすることがさらに好ましい。温度条件が上記の範囲内であれば、フッ素化合物が気体状で存在することができるとともに、窒化ケイ素のエッチング速度がより高くなりやすい。ここで、温度条件の温度とは、被エッチング部材の温度であるが、エッチング装置のチャンバー内に設置された、被エッチング部材を支持するステージの温度を使用することもできる。
本実施形態に係るエッチング方法によりエッチングする被エッチング部材は、エッチング対象物と非エッチング対象物を有するが、エッチング対象物で形成されている部分と非エッチング対象物で形成されている部分とを有する部材でもよいし、エッチング対象物と非エッチング対象物の混合物で形成されている部材でもよい。また、被エッチング部材は、エッチング対象物、非エッチング対象物以外のものを有していてもよい。
また、被エッチング部材の形状は特に限定されるものではなく、例えば、板状、箔状、膜状、粉末状、塊状であってもよい。被エッチング部材の例としては、前述した半導体基板が挙げられる。
エッチング対象物は窒化ケイ素を有するが、窒化ケイ素のみで形成されているものであってもよいし、窒化ケイ素のみで形成されている部分と他の材質で形成されている部分とを有するものであってもよいし、窒化ケイ素と他の材質の混合物で形成されているものであってもよい。
また、エッチング対象物の形状は、特に限定されるものではなく、例えば、板状、箔状、膜状、粉末状、塊状であってもよい。
非エッチング対象物は、フッ素化合物と実質的に反応しないか、又は、フッ素化合物との反応が極めて遅いため、本実施形態に係るエッチング方法によりエッチングを行っても、エッチングがほとんど進行しないものである。非エッチング対象物は、上記のような性質を有するならば特に限定されるものではないが、例えば、酸化ケイ素、フォトレジスト、アモルファスカーボン、窒化チタンや、銅、ニッケル、コバルト等の金属や、これら金属の酸化物、窒化物が挙げられる。これらの中でも、取扱性及び入手容易性の観点から、酸化ケイ素、フォトレジスト、アモルファスカーボンがより好ましい。
フッ素化合物ガス供給部1、希ガス供給部2、及び窒素ガス供給部3の構成は特に限定されるものではなく、例えば、ボンベやシリンダーなどであってもよい。また、フッ素化合物ガス流量制御装置4、希ガス流量制御装置5、及び窒素ガス流量制御装置6としては、例えば、マスフローコントローラーやフローメーターなどが利用できる。
エッチングを行う際の被エッチング部材12の温度は、0℃以上200℃以下とすることが好ましく、5℃以上170℃以下とすることがより好ましく、20℃以上150℃以下とすることがさらに好ましい。この温度範囲内であれば、被エッチング部材12が有するエッチング対象物(特に窒化ケイ素)のエッチングが円滑に進行するとともに、エッチング装置に対する負荷が小さく、エッチング装置の寿命が長くなりやすい。
例えば、フッ素化合物ガス供給用配管7と被エッチング部材12との位置関係は、エッチングガスを被エッチング部材12に接触させることができるならば、特に限定されない。また、チャンバー10の温度調節機構の構成についても、被エッチング部材12の温度を任意の温度に調節できればよいので、ステージ11上に温度調節機構を直接備える構成でもよいし、外付けの温度調節器でチャンバー10の外側からチャンバー10に加温又は冷却を行ってもよい。
(実施例1)
図1のエッチング装置と略同様の構成を有するエッチング装置を用いて、被エッチング部材のエッチングを行った。実施例1において用いた被エッチング部材について、図2を参照しながら説明する。
上記被エッチング部材と、これら3つの対比用積層物とを、エッチング装置のチャンバーの内部のステージ上に並べて載置し、ステージの温度を20℃とした。
測定圧力:大気圧(101.3kPa)
測定温度:28℃
測定雰囲気:大気中
走査範囲:幅80.0μm、高さ20.0μm、角度0°
エッチング対象物を窒化ケイ素膜とし、非エッチング対象物を二酸化ケイ素、フォトレジスト、及びアモルファスカーボンとするとともに、エッチングの条件(エッチングガスの組成、ステージの温度、チャンバー内の圧力、エッチング時間、遠隔プラズマ発生装置のソースパワー)を表1に示すとおりにして、実施例1と同様に遠隔プラズマエッチングを行った。そして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表1、2に示す。
エッチングガスを六フッ化硫黄ガスとアルゴンの混合ガスとした点と、遠隔プラズマ発生装置のソースパワーを400Wとした点と、エッチング時間を1分間とした点以外は、実施例1と同様にして遠隔プラズマエッチングを行った。そして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表2に示す。
エッチングガスを流量300mL/分のフッ化カルボニルガスと流量700mL/分のアルゴンの混合ガスとした点と、ステージ温度を150℃とした点と、遠隔プラズマ発生装置のソースパワーを0Wとした点(すなわち、プラズマを発生させなかった)と、エッチング時間を30分間とした点以外は、実施例1と同様にしてエッチングを行った。そして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表2に示す。
エッチングガスを流量800mL/分のフッ化カルボニルガスと流量200mL/分のアルゴンの混合ガスとした点と、遠隔プラズマ発生装置のソースパワーを400Wとした点以外は、実施例1と同様にして遠隔プラズマエッチングを行った。そして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表2に示す。
サムコ株式会社製のICPエッチング装置RIE-200iPを用いてエッチングガスのプラズマをチャンバー内で発生させ、エッチングガスのプラズマによりチャンバー内でエッチングを行う通常のプラズマエッチングを行う点と、エッチングの条件(エッチングガスの組成、ステージの温度、チャンバー内の圧力、エッチング時間、プラズマ発生装置のソースパワー及びバイアスパワー)を表3に示すとおりとする点以外は、実施例1と同様にして被エッチング部材と対比用積層物に対してエッチングを行った。そして、実施例1と同様にして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表3に示す。
エッチングガスを六フッ化硫黄ガスとアルゴンの混合ガスとした点と、プラズマ発生装置のバイアスパワーを80Wとした点以外は、実施例16と同様にしてプラズマエッチングを行った。そして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表3に示す。
エッチングガスを流量40mL/分のフッ化カルボニルガスと流量10mL/分のアルゴンの混合ガスとした点以外は、実施例16と同様にしてプラズマエッチングを行った。そして、エッチング対象物、非エッチング対象物のエッチング速度をそれぞれ算出し、その数値からエッチング選択比を算出した。結果を表3に示す。
実施例28において用いた被エッチング部材について、図3を参照しながら説明する。図3の被エッチング部材は、シリコン基板31上に膜厚35nmの窒化ケイ素膜32と膜厚35nmの酸化ケイ素膜33が交互に30層ずつ積層した構造を有している(図3においては、便宜上、交互に5層ずつ積層した構造を示してある。)。また、図3の被エッチング部材は、最上層の酸化ケイ素膜33の上に、膜厚300nmのアモルファスカーボン膜35がさらに積層された構造を有している。ここで、窒化ケイ素膜32と酸化ケイ素膜33がエッチング対象物であり、アモルファスカーボン膜35が非エッチング対象物である。さらに、図3の被エッチング部材は、30層の窒化ケイ素膜32と30層の酸化ケイ素膜33と1層のアモルファスカーボン膜35を積層方向に貫通する直径100nmの貫通孔34を有している。
エッチングの条件(エッチングガスの組成、ステージの温度、チャンバー内の圧力、エッチング時間、プラズマ発生装置のソースパワー)を表4に示すとおりにして、実施例28と同様にプラズマエッチングを行った。そして、実施例28と同様に、アモルファスカーボンに対する窒化ケイ素及び酸化ケイ素の相対的なエッチング速度を算出して、各エッチング速度の平均値及び標準偏差を算出した。結果を表4に示す。
実施例28と同様の被エッチング部材に対して、サムコ株式会社製のICPエッチング装置RIE-200iPを用いてエッチングを行った。プラズマ発生装置のバイアスパワーは0Wとし、その他のエッチングの条件(エッチングガスの組成、ステージの温度、チャンバー内の圧力、エッチング時間、プラズマ発生装置のソースパワー)は表5に示すとおりである。そして、実施例28と同様に、アモルファスカーボンに対する窒化ケイ素及び酸化ケイ素の相対的なエッチング速度を算出して、各エッチング速度の平均値及び標準偏差を算出した。結果を表5に示す。
実施例4~6の結果から、エッチングガス中のフッ化カルボニルの濃度に、窒化ケイ素のエッチング速度が極大となるポイントが存在することが示唆された。一方で、非エッチング対象物のエッチングは、エッチングガス中のフッ化カルボニルの濃度によらず殆ど進行しなかった。
実施例9、15の結果から、ステージの温度を高くすると、エッチング対象物である窒化ケイ素及び非エッチング対象物である酸化ケイ素、フォトレジスト、アモルファスカーボンのエッチング速度が向上することが分かる。
実施例12、13の結果から、エッチングガスとしてフッ化カルボニル、アルゴン、及び窒素ガスの混合ガスを用いた場合は、窒化ケイ素のエッチング速度が向上することが分かる。また、非エッチング対象物のエッチングもわずかに進行した。窒化ケイ素のエッチング速度が向上した理由としては、窒素ガスを添加することによってフッ化カルボニルからのフッ素原子の乖離が促進されたことが考えられる。
比較例2の結果から、プラズマを発生させない条件では、窒化ケイ素と同等の速度で酸化ケイ素、フォトレジスト、アモルファスカーボンのエッチングが進行するため、窒化ケイ素の選択的なエッチングが困難であることが分かる。
比較例3の結果から、エッチングガス中のフッ化カルボニルの濃度が高すぎる場合も、窒化ケイ素と共に酸化ケイ素、フォトレジスト、アモルファスカーボンのエッチングが進行することが分かる。
比較例5の結果から、エッチングガス中のフッ化カルボニルの濃度が高すぎる場合も、窒化ケイ素と共に、非エッチング対象物である酸化ケイ素、フォトレジスト、アモルファスカーボンがエッチングされることが分かる。
窒化ケイ素のエッチング速度の平均値に対するエッチング速度の標準偏差の比は、およそ2~7%であるため、窒化ケイ素膜32の積層方向位置に関係なく、30層の窒化ケイ素膜32のエッチングがほぼ均一に進行していることが分かった。これに対して、酸化ケイ素及びアモルファスカーボンのエッチング速度はいずれの条件においても窒化ケイ素のエッチング速度よりも小さかった。また、酸化ケイ素のエッチング速度の標準偏差はいずれの条件においても3以下であった。
2・・・希ガス供給部
3・・・窒素ガス供給部
4・・・フッ素化合物ガス流量制御装置
5・・・希ガス流量制御装置
6・・・窒素ガス流量制御装置
7・・・フッ素化合物ガス供給用配管
8・・・希ガス供給用配管
9・・・窒素ガス供給用配管
10・・・チャンバー
11・・・ステージ
12・・・被エッチング部材
13・・・排気用配管
14・・・温度計
15・・・真空ポンプ
16・・・圧力計
17・・・フッ素化合物ガス圧力制御装置
18・・・希ガス圧力制御装置
19・・・窒素ガス圧力制御装置
20・・・遠隔プラズマ発生装置
21・・・シリコン基板
22・・・窒化ケイ素膜
23・・・二酸化ケイ素基板
31・・・シリコン基板
32・・・窒化ケイ素膜
33・・・酸化ケイ素膜
34・・・貫通孔
35・・・アモルファスカーボン膜
Claims (11)
- 炭素-酸素二重結合及びエーテル結合の少なくとも一方の結合を分子内に有する炭素数3以下のフッ素化合物を含有するエッチングガスを、前記エッチングガスによるエッチングの対象であるエッチング対象物と前記エッチングガスによるエッチングの対象ではない非エッチング対象物とを有する被エッチング部材に、プラズマの存在下で接触させ、前記非エッチング対象物に比べて前記エッチング対象物を選択的にエッチングするエッチング工程を備え、
前記エッチングガス中の前記フッ素化合物の濃度が0.5体積%以上40体積%以下であり、前記エッチング対象物が窒化ケイ素を有するエッチング方法。 - 前記非エッチング対象物が、酸化ケイ素、フォトレジスト、及びアモルファスカーボンから選ばれる少なくとも一種を有する請求項1に記載のエッチング方法。
- 前記エッチング工程を1Pa以上3kPa以下の圧力条件で行う請求項1又は請求項2に記載のエッチング方法。
- 前記エッチング工程を0℃以上200℃以下の温度条件で行う請求項1~3のいずれか一項に記載のエッチング方法。
- 前記エッチングガス中の前記フッ素化合物の濃度が1体積%以上30体積%以下である請求項1~4のいずれか一項に記載のエッチング方法。
- 前記エッチングガスが、前記フッ素化合物と希釈ガスを含有する混合ガスである請求項1~5のいずれか一項に記載のエッチング方法。
- 前記希釈ガスが、窒素ガス、ヘリウム、アルゴン、ネオン、クリプトン、及びキセノンから選ばれる少なくとも一種である請求項6に記載のエッチング方法。
- 前記エッチングガスが、前記フッ素化合物と希ガスと窒素ガスを含有する混合ガスであり、前記エッチングガス中の前記窒素ガスの濃度が10体積%以下である請求項1~5のいずれか一項に記載のエッチング方法。
- 前記エッチングガスが、前記フッ素化合物と希ガスと窒素ガスに加えて、さらに前記フッ素化合物以外の含酸素ガスを含有する混合ガスである請求項8に記載のエッチング方法。
- 前記フッ素化合物が、フッ化カルボニル、フッ化オキサリル、及びヘキサフルオロプロピレンオキシドから選ばれる少なくとも一種である請求項1~9のいずれか一項に記載のエッチング方法。
- 請求項1~10のいずれか一項に記載のエッチング方法を用いて半導体素子を製造する半導体素子の製造方法であって、
前記被エッチング部材が、前記エッチング対象物及び前記非エッチング対象物を有する半導体基板であり、
前記半導体基板から前記エッチング対象物の少なくとも一部を前記エッチングにより除去する処理工程を備える半導体素子の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL298826A IL298826A (en) | 2020-07-09 | 2021-05-27 | Etching method and semiconductor component manufacturing method |
US18/009,300 US20230290643A1 (en) | 2020-07-09 | 2021-05-27 | Etching method and semiconductor element manufacturing method |
JP2022534943A JPWO2022009553A1 (ja) | 2020-07-09 | 2021-05-27 | |
CN202180041568.6A CN115868011A (zh) | 2020-07-09 | 2021-05-27 | 蚀刻方法以及半导体元件的制造方法 |
EP21838676.1A EP4181176A4 (en) | 2020-07-09 | 2021-05-27 | ETCHING METHOD AND METHOD FOR PRODUCING A SEMICONDUCTOR ELEMENT |
KR1020227042553A KR20230006007A (ko) | 2020-07-09 | 2021-05-27 | 에칭 방법 및 반도체 소자의 제조 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020-118784 | 2020-07-09 | ||
JP2020118784 | 2020-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022009553A1 true WO2022009553A1 (ja) | 2022-01-13 |
Family
ID=79552317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/020221 WO2022009553A1 (ja) | 2020-07-09 | 2021-05-27 | エッチング方法及び半導体素子の製造方法 |
Country Status (8)
Country | Link |
---|---|
US (1) | US20230290643A1 (ja) |
EP (1) | EP4181176A4 (ja) |
JP (1) | JPWO2022009553A1 (ja) |
KR (1) | KR20230006007A (ja) |
CN (1) | CN115868011A (ja) |
IL (1) | IL298826A (ja) |
TW (1) | TWI778649B (ja) |
WO (1) | WO2022009553A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0613351A (ja) * | 1992-06-29 | 1994-01-21 | Sony Corp | ドライエッチング方法 |
JP2005051236A (ja) * | 2003-07-15 | 2005-02-24 | Air Products & Chemicals Inc | フルオロカーボンエッチングプラズマ中における次亜フッ素酸塩、フルオロペルオキシド及び(又は)フルオロトリオキシドの酸化剤としての使用 |
JP2013508990A (ja) * | 2009-10-26 | 2013-03-07 | ゾルファイ フルーオル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Tftマトリックスを製造するためのエッチングプロセス |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100223614B1 (ko) | 1996-11-12 | 1999-10-15 | 윤종용 | 불휘발성 반도체 메모리 장치 |
JP4596287B2 (ja) * | 2008-09-19 | 2010-12-08 | カシオ計算機株式会社 | シリコンを含む膜のドライエッチング方法 |
JP5310409B2 (ja) * | 2009-09-04 | 2013-10-09 | 東京エレクトロン株式会社 | プラズマエッチング方法 |
JP5691357B2 (ja) * | 2010-09-30 | 2015-04-01 | カシオ計算機株式会社 | 半導体デバイス形成用基板の製造方法及びドライエッチング方法 |
TW201342466A (zh) * | 2011-12-21 | 2013-10-16 | Solvay | 蝕刻薄晶圓上之SiO2層的方法 |
US8608973B1 (en) * | 2012-06-01 | 2013-12-17 | Lam Research Corporation | Layer-layer etch of non volatile materials using plasma |
JP6079649B2 (ja) | 2014-01-08 | 2017-02-15 | 豊田合成株式会社 | ドライエッチング装置およびドライエッチング方法 |
WO2018159368A1 (ja) * | 2017-02-28 | 2018-09-07 | セントラル硝子株式会社 | ドライエッチング剤、ドライエッチング方法及び半導体装置の製造方法 |
-
2021
- 2021-05-27 CN CN202180041568.6A patent/CN115868011A/zh active Pending
- 2021-05-27 KR KR1020227042553A patent/KR20230006007A/ko not_active Application Discontinuation
- 2021-05-27 EP EP21838676.1A patent/EP4181176A4/en active Pending
- 2021-05-27 IL IL298826A patent/IL298826A/en unknown
- 2021-05-27 US US18/009,300 patent/US20230290643A1/en active Pending
- 2021-05-27 WO PCT/JP2021/020221 patent/WO2022009553A1/ja unknown
- 2021-05-27 JP JP2022534943A patent/JPWO2022009553A1/ja active Pending
- 2021-06-07 TW TW110120562A patent/TWI778649B/zh active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0613351A (ja) * | 1992-06-29 | 1994-01-21 | Sony Corp | ドライエッチング方法 |
JP2005051236A (ja) * | 2003-07-15 | 2005-02-24 | Air Products & Chemicals Inc | フルオロカーボンエッチングプラズマ中における次亜フッ素酸塩、フルオロペルオキシド及び(又は)フルオロトリオキシドの酸化剤としての使用 |
JP2013508990A (ja) * | 2009-10-26 | 2013-03-07 | ゾルファイ フルーオル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Tftマトリックスを製造するためのエッチングプロセス |
Non-Patent Citations (1)
Title |
---|
See also references of EP4181176A4 * |
Also Published As
Publication number | Publication date |
---|---|
IL298826A (en) | 2023-02-01 |
TWI778649B (zh) | 2022-09-21 |
EP4181176A4 (en) | 2024-02-21 |
CN115868011A (zh) | 2023-03-28 |
JPWO2022009553A1 (ja) | 2022-01-13 |
US20230290643A1 (en) | 2023-09-14 |
TW202213501A (zh) | 2022-04-01 |
EP4181176A1 (en) | 2023-05-17 |
KR20230006007A (ko) | 2023-01-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6032033B2 (ja) | シリコンのドライエッチング方法 | |
WO2022009553A1 (ja) | エッチング方法及び半導体素子の製造方法 | |
WO2021171986A1 (ja) | ドライエッチング方法、半導体素子の製造方法、及びクリーニング方法 | |
TWI778566B (zh) | 蝕刻方法及半導體元件的製造方法 | |
WO2022085520A1 (ja) | エッチング方法及び半導体素子の製造方法 | |
WO2021079780A1 (ja) | 窒化ケイ素のエッチング方法及び半導体素子の製造方法 | |
WO2021241143A1 (ja) | ドライエッチング方法、半導体素子の製造方法、及びクリーニング方法 | |
WO2023017696A1 (ja) | エッチング方法及び半導体素子の製造方法 | |
TWI828964B (zh) | 蝕刻方法 | |
WO2022259953A1 (ja) | ドライエッチング方法、半導体素子の製造方法、及びクリーニング方法 | |
WO2022190809A1 (ja) | エッチングガス及びエッチング方法 | |
WO2022080267A1 (ja) | エッチングガス、エッチング方法、及び半導体素子の製造方法 | |
WO2022080268A1 (ja) | エッチングガス、エッチング方法、及び半導体素子の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21838676 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022534943 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20227042553 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2021838676 Country of ref document: EP Effective date: 20230209 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |