WO2016125579A1 - ニオブ酸系強誘電体薄膜素子の製造方法 - Google Patents
ニオブ酸系強誘電体薄膜素子の製造方法 Download PDFInfo
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- WO2016125579A1 WO2016125579A1 PCT/JP2016/051389 JP2016051389W WO2016125579A1 WO 2016125579 A1 WO2016125579 A1 WO 2016125579A1 JP 2016051389 W JP2016051389 W JP 2016051389W WO 2016125579 A1 WO2016125579 A1 WO 2016125579A1
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- Prior art keywords
- thin film
- acid
- ferroelectric thin
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- manufacturing
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- 239000010409 thin film Substances 0.000 title claims abstract description 151
- 239000002253 acid Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 68
- 238000005530 etching Methods 0.000 claims abstract description 192
- 239000010408 film Substances 0.000 claims abstract description 75
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000002738 chelating agent Substances 0.000 claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 36
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000001039 wet etching Methods 0.000 claims abstract description 20
- 229940120146 EDTMP Drugs 0.000 claims abstract description 18
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 claims abstract description 17
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims abstract description 14
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 72
- 230000008569 process Effects 0.000 claims description 45
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
- RNMCCPMYXUKHAZ-UHFFFAOYSA-N 2-[3,3-diamino-1,2,2-tris(carboxymethyl)cyclohexyl]acetic acid Chemical compound NC1(N)CCCC(CC(O)=O)(CC(O)=O)C1(CC(O)=O)CC(O)=O RNMCCPMYXUKHAZ-UHFFFAOYSA-N 0.000 claims description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 11
- OXHDYFKENBXUEM-UHFFFAOYSA-N glyphosine Chemical compound OC(=O)CN(CP(O)(O)=O)CP(O)(O)=O OXHDYFKENBXUEM-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000004544 sputter deposition Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 5
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 5
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 5
- 239000003513 alkali Substances 0.000 abstract description 4
- -1 GBMP Chemical compound 0.000 abstract description 2
- FCKYPQBAHLOOJQ-UHFFFAOYSA-N Cyclohexane-1,2-diaminetetraacetic acid Chemical compound OC(=O)CN(CC(O)=O)C1CCCCC1N(CC(O)=O)CC(O)=O FCKYPQBAHLOOJQ-UHFFFAOYSA-N 0.000 abstract 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 20
- 229960004106 citric acid Drugs 0.000 description 20
- 239000000463 material Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 13
- 238000002156 mixing Methods 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 229920002120 photoresistant polymer Polymers 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 10
- 229910021529 ammonia Inorganic materials 0.000 description 9
- 239000011734 sodium Substances 0.000 description 9
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 7
- 239000003153 chemical reaction reagent Substances 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 238000001312 dry etching Methods 0.000 description 6
- 239000013074 reference sample Substances 0.000 description 6
- 239000000523 sample Substances 0.000 description 6
- 230000010287 polarization Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000001755 magnetron sputter deposition Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 3
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
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- 238000001035 drying Methods 0.000 description 2
- 238000005566 electron beam evaporation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000383 hazardous chemical Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910000484 niobium oxide Inorganic materials 0.000 description 2
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
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- 230000003746 surface roughness Effects 0.000 description 2
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229960002303 citric acid monohydrate Drugs 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- XQRLCLUYWUNEEH-UHFFFAOYSA-N diphosphonic acid Chemical compound OP(=O)OP(O)=O XQRLCLUYWUNEEH-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005621 ferroelectricity Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- MVDSPIQMADQKKM-UHFFFAOYSA-N lithium potassium sodium Chemical compound [Li+].[Na+].[K+] MVDSPIQMADQKKM-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005616 pyroelectricity Effects 0.000 description 1
- 238000001552 radio frequency sputter deposition Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
- H10N30/074—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
- H10N30/076—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing by vapour phase deposition
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/08—Oxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
-
- 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
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/08—Shaping or machining of piezoelectric or electrostrictive bodies
- H10N30/082—Shaping or machining of piezoelectric or electrostrictive bodies by etching, e.g. lithography
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
- H10N30/8542—Alkali metal based oxides, e.g. lithium, sodium or potassium niobates
Definitions
- the present invention relates to a ferroelectric thin film element, and more particularly, to a method of manufacturing a thin film element including a lead-free niobic acid ferroelectric.
- Ferroelectrics are very attractive substances due to their unique properties (for example, extremely high relative dielectric constant, pyroelectricity, piezoelectricity, ferroelectricity, etc.). It is used as an element, a piezoelectric element, a ferroelectric memory, etc.
- Typical examples include barium titanate (BaTiO 3 ) and lead zirconate titanate (Pb (Zr 1-x Ti x ) O 3 , abbreviated as PZT) having a perovskite structure.
- PZT lead zirconate titanate
- PZT is a specific hazardous substance containing lead, but currently there is no suitable commercial product that can be substituted for pyroelectric material / piezoelectric material, so the RoHS Directive (use of specific hazardous substances contained in electrical and electronic equipment) Exempt from the European Parliament and Council Directive on restrictions).
- the RoHS Directive use of specific hazardous substances contained in electrical and electronic equipment
- the European Parliament and Council Directive Exempt from the European Parliament and Council Directive on restrictions.
- the demand for global environmental conservation has been increasing worldwide, and the development of pyroelectric elements and piezoelectric elements using ferroelectrics that do not contain lead (lead-free ferroelectrics) is strongly desired.
- a piezoelectric element is an element that uses the piezoelectric effect of a ferroelectric substance, and is used for an actuator that generates displacement or vibration in response to voltage application to a ferroelectric substance (piezoelectric substance), or for stress deformation to a piezoelectric substance.
- a functional electronic component such as a stress sensor that generates a voltage.
- a pyroelectric element is an element that detects light including infrared rays by the pyroelectric effect of a ferroelectric substance, and is widely used as an infrared sensor for detecting a human body.
- the piezoelectric element has a basic structure in which a piezoelectric body is sandwiched between two electrodes, and is manufactured by microfabrication into a beam shape or a tuning fork shape according to the application. For this reason, the microfabrication process is one of the very important technologies when a piezoelectric element using a lead-free piezoelectric material is put into practical use.
- a piezoelectric thin film wafer having a piezoelectric thin film (composition formula: (K 1-x Na x ) NbO 3 , 0.4 ⁇ x ⁇ 0.7) on a substrate is used using a gas containing Ar.
- a method for manufacturing a piezoelectric thin film wafer is disclosed. According to Patent Document 2, a piezoelectric thin film can be finely processed with high accuracy, and a highly reliable piezoelectric thin film element and an inexpensive piezoelectric thin film device are obtained.
- Patent Document 3 discloses a step of forming a lower electrode on a substrate and a piezoelectric film having an alkali niobium oxide perovskite structure represented by a composition formula (K 1-x Na x ) NbO 3 on the lower electrode.
- a method for manufacturing a piezoelectric film element comprising a forming step and a step of performing wet etching on the piezoelectric film, and using the Cr film as a mask in the wet etching step.
- Patent Document 3 by using a hydrofluoric acid-based etching solution with a Cr film as a mask and wet etching the piezoelectric film layer, the processing can be selectively stopped in the lower electrode layer, and the piezoelectric film layer can be shortened. It is said that fine processing can be performed with accuracy in time.
- JP 2007-19302 A JP 2012-33693 A JP 2012-244090 A
- niobate-based ferroelectrics for example, potassium sodium niobate, (K 1-x Na x ) NbO 3
- K 1-x Na x ) NbO 3 potassium sodium niobate, (K 1-x Na x ) NbO 3
- Establishing a microfabrication process with high dimensional accuracy and low cost is very important for practical use and mass production of thin-film elements using niobate-based ferroelectrics as an alternative to PZT thin-film elements. is important.
- the wet etching technique described in Patent Document 3 has a relatively high throughput and is more advantageous for reducing the manufacturing cost than the dry etching process.
- niobic acid-based ferroelectrics are chemically stable materials, and until now it has been difficult to perform fine processing unless a hydrofluoric acid-based etching solution is used.
- Hydrofluoric acid-based etchants require strict safety measures in handling, and there are restrictions on the etching masks that can be used, so that the advantages of reducing manufacturing costs are greatly offset when considering mass production. there were.
- an object of the present invention is to solve the above-mentioned problems and to provide a manufacturing method capable of finely processing a thin film element using a niobic acid-based ferroelectric material containing no lead with high dimensional accuracy and at a lower cost than before. .
- One aspect of the present invention is a method of manufacturing a niobic acid ferroelectric thin film element, A lower electrode film forming step of forming a lower electrode film on the substrate; A ferroelectric thin film forming step of forming a niobic acid ferroelectric thin film on the lower electrode film; An etching mask pattern forming step for forming an etching mask on the niobic acid-based ferroelectric thin film so as to have a desired pattern;
- the niobium-based ferroelectric thin film is subjected to wet etching using an etchant containing a predetermined chelating agent, an alkaline aqueous solution, and a hydrogen peroxide solution (abbreviated as H 2 O 2 aq.).
- the predetermined chelating agent includes ethylenediaminetetramethylenephosphonic acid (abbreviated as EDTMP), nitrilotris (methylenephosphonic acid) (abbreviated as NTMP), cyclohexanediaminetetraacetic acid (abbreviated as CyDTA), 1-hydroxyethane-1,1- At least selected from diphosphonic acid (etidronic acid) (abbreviated HEDP), glycine-N, N-bis (methylenephosphonic acid) (abbreviated GBMP), diethylenetriaminepenta (methylenephosphonic acid) (abbreviated DTPMP), and citric acid
- the alkaline aqueous solution includes an aqueous ammonia solution (abbreviated as NH 3 aq.), And a method for manufacturing a niobic acid ferroelectric thin film
- the present invention can be modified or changed as follows in the method for manufacturing a niobic acid ferroelectric thin film element according to the present invention.
- EDTMP, NTMP, CyDTA, HEDP, GBMP, or DTPMP is used as the predetermined chelating agent
- the molar concentration of the chelating agent in the etching solution is 0.001 M (mol / L) or more and 0.5 M (mol) / L) or less
- citric acid is used as the predetermined chelating agent
- the etching mask is a silicon oxide (SiO 2 ) film.
- the temperature of the etching solution is 50 ° C. or higher and lower than 100 ° C.
- the niobate-based ferroelectric is potassium sodium niobate (abbreviated as (K 1-x Na x ) NbO 3 , KNN) or lithium niobate (abbreviated as LiNbO 3 , LN).
- the lower electrode film is platinum (Pt).
- the niobic acid ferroelectric thin film is formed by sputtering so that the crystal system is pseudo cubic or tetragonal and the main surface is preferentially oriented in the (0 0 1) plane.
- the substrate is a silicon (Si) substrate having a thermal oxide film on the surface thereof.
- the manufacturing method includes an upper electrode forming step of forming an upper electrode on the niobic acid-based ferroelectric thin film finely processed into a desired pattern, and a niobic acid-based ferroelectric thin film on which the upper electrode is formed. And a dicing step of cutting out a chip-like niobic acid ferroelectric thin film element from the substrate.
- the present invention it becomes possible to finely process a niobic acid-based ferroelectric material containing no lead into a desired pattern by wet etching with high dimensional accuracy and lower cost than conventional ones. As a result, it is possible to provide a niobic acid ferroelectric thin film element that is finely processed into a desired pattern while reducing the manufacturing cost.
- FIG. 3 is an enlarged schematic cross-sectional view showing a manufacturing process (up to a ferroelectric thin film etching process) of a niobic acid ferroelectric thin film element according to the present invention. It is an expanded sectional schematic diagram which shows the manufacturing process (after a ferroelectric thin film etching process) of the niobic acid type ferroelectric thin film element concerning this invention. It is a graph which shows an example of the relationship between an etching rate and etching liquid temperature. It is a SEM observation image which shows the example of the etching result when the density
- the present inventors have proposed niobic acid-based ferroelectrics as lead-free ferroelectrics that can be expected to have the same pyroelectric and piezoelectric properties as lead zirconate titanate (Pb (Zr 1-x Ti x ) O 3 , PZT). Focusing on the body (potassium sodium niobate ((K 1-x Na x ) NbO 3 , KNN) and lithium niobate (LiNbO 3 , LN)), the inventors studied diligently on the wet etching method of the material.
- Chelating agents are considered to be less harmful to living organisms and the environment than hydrofluoric acid, and can greatly reduce manufacturing costs including etching equipment costs. Further, since a more general silicon oxide film can be used as an etching mask, the etching process can be simplified and the process cost can be further reduced. The present invention has been completed based on these findings.
- FIG. 1 is an enlarged schematic cross-sectional view showing a manufacturing process (up to a ferroelectric thin film etching process) of a niobic acid ferroelectric thin film element according to the present invention.
- a manufacturing process up to a ferroelectric thin film etching process
- the washing step and the drying step are omitted, it is preferable that these steps are appropriately performed as necessary.
- the substrate 11 is prepared.
- the material of the substrate 11 is not particularly limited, and can be appropriately selected according to the use of the pyroelectric element or the piezoelectric element.
- silicon Si
- SOI Silicon on Insulator
- quartz glass gallium arsenide
- GaAs gallium arsenide
- Al 2 O 3 sapphire
- metals such as stainless steel, magnesium oxide (MgO), strontium titanate (SrTiO 3 )
- the substrate 11 is made of a conductive material, it preferably has an electrical insulating film (for example, an oxide film) on its surface.
- an electrical insulating film for example, an oxide film
- a thermal oxidation process or a chemical vapor deposition (CVD) method can be suitably used.
- the lower electrode film 12 is formed on the substrate 11 (see FIG. 1A).
- the material of the lower electrode film 12 is not particularly limited, but it is preferable to use platinum (Pt) or an alloy containing Pt as a main component. Since Pt is inactive with respect to the etching solution used in the ferroelectric thin film etching process described later, it can function as an etching stopper. Although there is no particular limitation on the method of forming the lower electrode film 12, for example, a sputtering method can be suitably used.
- the lower electrode film 12 preferably has an arithmetic average surface roughness Ra of 0.86 nm or less in order to sufficiently exhibit the pyroelectric characteristics and piezoelectric characteristics of the niobic acid ferroelectric thin film.
- a niobic acid ferroelectric thin film 13 is formed on the lower electrode film 12 (see FIG. 1A).
- KNN ((K 1 ⁇ x Na x ) NbO 3 , 0.4 ⁇ x ⁇ 0.7) is preferably used.
- a method for forming the niobic acid-based ferroelectric thin film 13 a sputtering method using a KNN sintered target or an electron beam evaporation method is preferable.
- the niobic acid ferroelectric thin film 13 to be formed has a pyroelectric property in which the crystal system of the KNN crystal is pseudo-cubic or tetragonal and the main surface of the thin film is preferentially oriented to the (0 0 1) plane. -It is preferable in terms of piezoelectric characteristics.
- the KNN thin film contains impurities of lithium (Li), tantalum (Ta), antimony (Sb), calcium (Ca), copper (Cu), barium (Ba) and titanium (Ti) within a total range of 5 atomic% or less. May be included.
- LN LiNbO 3
- Others are the same as in the case of KNN.
- an etching mask for wet etching described later is formed on the formed piezoelectric thin film 13.
- a photoresist pattern 14 is formed on the piezoelectric thin film 13 by a photolithography process (see FIG. 1B).
- an etching mask film 15 is formed on the photoresist pattern 14 (see FIG. 1C).
- an etching mask pattern 15 ′ having a desired pattern is formed by a lift-off process (see FIG. 1D).
- the etching mask film 15 is not particularly limited as long as it has sufficient resistance to the etching solution.
- a noble metal film for example, an Au film, a Pt film, a Pd film
- an oxide film eg, a silicon oxide film
- a silicon oxide film for example, a SiO 2 film
- the etching mask pattern 15 ′ may be formed by a process other than photolithography / lift-off.
- etching process In this step, wet etching is performed on the niobic acid ferroelectric thin film 13, and fine processing is performed to a pattern defined by the etching mask pattern 15 ′.
- the etchant it is preferable to use an etchant that contains a chelating agent, an alkaline aqueous solution, and a hydrogen peroxide solution and does not contain hydrofluoric acid. As a result, the cost of safety measures required for the conventional hydrofluoric acid etching solution can be reduced.
- Chelating agents include ethylenediaminetetramethylenephosphonic acid (EDTMP), nitrilotris (methylenephosphonic acid) (NTMP), cyclohexanediaminetetraacetic acid (CyDTA), 1-hydroxyethane-1,1-diphosphonic acid (etidronic acid) (HEDP ), Glycine-N, N-bis (methylenephosphonic acid) (GBMP), diethylenetriaminepenta (methylenephosphonic acid) (DTPMP), and citric acid can be preferably used.
- ETMP ethylenediaminetetramethylenephosphonic acid
- NTMP nitrilotris (methylenephosphonic acid)
- CyDTA cyclohexanediaminetetraacetic acid
- HEDP 1-hydroxyethane-1,1-diphosphonic acid
- GBMP N-bis (methylenephosphonic acid)
- DTPMP diethylenetriaminepenta
- citric acid can be preferably used.
- the molar concentration of the chelating agent in the etching solution is preferably 0.001 M (mol / L) or more and 0.5 M (mol / L) or less, More preferably, it is 0.003 to 0.3 M, and more preferably 0.01 to 0.2 M.
- the molar concentration of these chelating agents is less than 0.001M, the etching reaction activity becomes insufficient, and when it exceeds 0.5M, the etching reaction activity decreases.
- the molar concentration of citric acid in the etching solution is preferably 0.03 to M (mol / L) or more and 1 to M (mol / L) or less, more preferably 0.05 to M or more and 0.7 to M or less. More preferably, it is 0.1 to 0.6 M.
- the molar concentration of citric acid is less than 0.03M, the etching reaction activity becomes insufficient, and when it exceeds 1M, the etching reaction activity decreases.
- an alkaline aqueous solution and a hydrogen peroxide solution H 2 O 2 aq.
- aqueous alkaline solution an aqueous ammonia solution (NH 3 aq.), An aqueous sodium hydroxide solution (NaOH aq.), Or an aqueous potassium hydroxide solution (KOH aq.) Can be used, but it is preferable to mainly contain an aqueous ammonia solution.
- the etching solution is preferably adjusted so that its hydrogen ion index (pH) is 7.5 or more and 12 or less, and more preferably 8 or more and 10 or less.
- pH hydrogen ion index
- the etching solution is preferably adjusted so that its hydrogen ion index (pH) is 7.5 or more and 12 or less, and more preferably 8 or more and 10 or less.
- the ammonia concentration is preferably, for example, 3 to M (mol / L) to 10 to M (mol / L).
- the pH can be adjusted by adding a strong acid (for example, hydrochloric acid) or a strong base (for example, sodium hydroxide or potassium hydroxide).
- the concentration of hydrogen peroxide is preferably 4 to M (mol / L) to 9 to M (mol / L), more preferably 5 to 8 M. If the hydrogen peroxide concentration is less than 4M, the etching reaction activity becomes insufficient, and if it exceeds 9M, it becomes difficult to adjust the etching solution.
- medical agent which comprises the said etching liquid a commercially available reagent can be used, respectively.
- the amount of the etching solution to be prepared is relatively large (for example, when the amount of the etching solution is 2L or more) It is preferable to prepare by a two-component mixing method in which a concentrated solution (chelating agent / ammonia concentrated solution) composed of aqueous ammonia is added and diluted and mixed. Since the chelating agent / ammonia concentrated solution has an advantage of excellent storage stability, it can be prepared in advance.
- a concentrated solution chelating agent / ammonia concentrated solution
- the required amount of etching solution can be prepared in a very short time immediately before the wet etching process, and the time required for the entire etching process can be greatly reduced. (As a result, the process cost can be further reduced).
- etching temperature temperature of the etching solution
- the etching reaction activity can be enhanced by heating from room temperature. Specifically, 50 ° C or higher is preferable, 60 ° C or higher is more preferable, and 80 ° C or higher is even more preferable. However, from the viewpoint of ensuring the safety of the work environment, it is preferably less than 100 ° C.
- a chemically very stable peroxy chelate for example, Nb-H 2 O 2 -EDTMP can be obtained by coexisting a chelating agent and hydrogen peroxide. ) Is considered to etch the niobic acid ferroelectric.
- the etching mask pattern 15 ' is removed by using an etching solution for silicon oxide film (for example, buffered hydrofluoric acid), so that the niobic acid ferroelectric material finely processed into a desired pattern is obtained.
- etching solution for silicon oxide film for example, buffered hydrofluoric acid
- FIG. 2 is an enlarged cross-sectional schematic view showing a manufacturing process (after the ferroelectric thin film etching process) of the niobic acid ferroelectric thin film element according to the present invention.
- the upper electrode is formed on the niobic acid-based ferroelectric thin film (niobic acid-based ferroelectric thin film pattern 13 ′) finely processed into the desired pattern obtained in the previous step.
- a photoresist pattern 21 is formed by leaving a space for forming an upper electrode by a photolithography process, and an upper electrode film 22 is formed on the photoresist pattern 21 (see FIG. 2A).
- the rest of the upper electrode 22 ′ is removed by the lift-off process (see FIG. 2B).
- As a material of the upper electrode film 22 (upper electrode 22 ′) for example, aluminum (Al), gold (Au), nickel (Ni), Pt, or the like can be preferably used.
- the chip-like niobic acid ferroelectric thin film element 20 is cut out from the substrate having the niobic acid ferroelectric thin film pattern 13 ′ on which the upper electrode 22 ′ is formed (see FIG. 2C).
- Reference numeral 11 ′ represents a chip-shaped substrate, and reference numeral 12 ′ represents a lower electrode.
- the niobic acid ferroelectric thin film element 20 including the niobic acid ferroelectric thin film finely processed into a desired pattern can be obtained.
- the timing at which the dicing process is performed and it may be performed at an appropriate timing from the viewpoint of optimizing the entire manufacturing process.
- a Ti layer having a thickness of 2.2 nm was formed on a Si substrate by RF magnetron sputtering as an adhesion layer for improving adhesion between the substrate 11 and the lower electrode film 12.
- a Pt layer having a thickness of 205 nm was formed as a lower electrode film 12 on the Ti layer by RF magnetron sputtering (see FIG. 1A).
- the sputter deposition conditions for the adhesion layer and the lower electrode film were a pure Ti target and a pure Pt target, a substrate temperature of 250 ° C., a discharge power of 200 ⁇ W, an Ar atmosphere, and a pressure of 2.5 ⁇ Pa.
- the surface roughness of the formed lower electrode film 12 was measured, and it was confirmed that the arithmetic average roughness Ra was 0.86 nm or less. Note that an RF sputtering apparatus (ULVAC, Inc., model: SH-350-T10) was used as the sputtering apparatus (the same applies hereinafter).
- a KNN thin film (K 0.35 Na 0.65 ) NbO 3 ) having a thickness of about 1.9 ⁇ m was deposited on the lower electrode film 12 as a niobic acid-based ferroelectric thin film 13 by RF magnetron sputtering (FIG. 1 ( a)).
- the photoresist pattern 14 was removed (lift-off) using a resist removing solution (manufactured by Kanto Chemical Co., Ltd., JELK series), and an etching mask pattern 15 ′ was formed on the KNN thin film (see FIG. 1 (d)).
- a small piece (6 mm x 9 mm) was cut from the KNN thin film laminated substrate on which the etching mask pattern 15 'was formed, and KNN thin film patterns were formed by wet etching the KNN thin film under various etching conditions (Fig. 1 (e) and (f)).
- the chemicals for the etching solution the prescribed chelating agent, ammonia water (NH 3 aq., Manufactured by Kanto Chemical Co., Inc., reagent grade, 29% content), and hydrogen peroxide (H 2 O 2 aq., Kanto Chemical)
- NH 3 aq. Manufactured by Kanto Chemical Co., Inc.
- reagent grade 29% content
- hydrogen peroxide H 2 O 2 aq., Kanto Chemical
- Specific chelating agents include ethylenediaminetetramethylene phosphonic acid (EDTMP, manufactured by Kirest Co., Ltd., purity 90% or higher), nitrilotris (methylene phosphonic acid) (NTMP, manufactured by Tokyo Chemical Industry Co., Ltd., purity 50% or higher), cyclohexane Diamine tetraacetic acid monohydrate (CyDTA ⁇ H 2 O, manufactured by Kirest Co., Ltd.), 1-hydroxyethane-1,1-diphosphonic acid (etidronic acid) (HEDP, manufactured by Kirest Corp., purity 60% or more), Glycine-N, N-bis (methylenephosphonic acid) (GBMP, manufactured by Tokyo Chemical Industry Co., Ltd., purity 97% or more), diethylenetriaminepenta (methylenephosphonic acid) (DTPMP, manufactured by Italmatch Japan Co., Ltd., Dequest (R) 2060S), and citric acid monohydrate (manufactured by Kanto Chemical Co., Inc., purity 99.
- EDTA ethylenediaminetetraacetic acid
- Etching rate The relationship between the etching rate and the etching temperature (etching solution temperature) was investigated.
- an etchant an etchant obtained by mixing 0.1 M chelating agent, 3.5 M ammonia water, and 7.5 M hydrogen peroxide solution was used.
- the initial pH of the etching solution was 9.6 to 9.7.
- the etchant temperature was 70 to 95 ° C.
- the SiO 2 mask was removed with buffered hydrofluoric acid (BHF 16, manufactured by Kanto Chemical Co., Inc., for semiconductors, content 22%). Thereafter, the etching property (here, the average etching rate obtained by dividing the step of the KNN thin film by the etching time) was evaluated by measuring the step of the KNN thin film. The results are shown in FIG.
- FIG. 3 is a graph showing an example of the relationship between the etching rate and the etchant temperature.
- the etching rate increased as the etching solution temperature (etching temperature) was increased.
- the same results as in FIG. 3 were obtained also in etching solutions using other chelating agents.
- Table 1 summarizes the relationship between various chelating agents and the etching rate at a chelating agent concentration of 0.1 M and an etching solution temperature of 85 ° C. (about 85 ⁇ 1 ° C.). As can be seen from the results in Table 1, it was confirmed that a sufficiently high etching rate was obtained using any chelating agent. In addition, it was confirmed that the etching solution of the present invention exhibits an etching rate equal to or higher than that of an etching solution using EDTA as a reference example.
- the etching rate allowable from the viewpoint of mass productivity is briefly considered.
- the etching rate in the conventional dry etching process is a level of 10 to 40 nm / min.
- the process of the present invention is a wet etching process, and a much larger number of samples can be simultaneously etched than a dry etching process. For example, assuming that 10 times the number of sheets corresponding to one dry etching apparatus is simultaneously wet-etched, the manufacturing throughput is equivalent to 10 times the etching rate of the dry process. From this, even if the etching rate of the process of the present invention is equivalent to that of the dry etching process, it can be said that there is a sufficient effect from the viewpoint of mass productivity. From this point of view, if an etching rate of about 10 nm / min or more can be obtained, the manufacturing cost can be sufficiently reduced.
- FIG. 4 is an SEM observation image showing an example of the etching result when the concentration of various chelating agents is 0.1M. As shown in FIG. 4, it was confirmed that the KNN thin film was sufficiently removed by etching for 30 minutes regardless of which chelating agent was used.
- FIG. 5 is an SEM observation image showing an example of the etching result when CyDTA is used as a chelating agent.
- the etching rate was insufficient at a CyDTA concentration of 0.0001M.
- a sufficient etching rate can be obtained at a CyDTA concentration of 0.001 to 0.5 mm.
- the etching rate clearly decreased at a CyDTA concentration of 0.7 M.
- EDTMP, NTMP, HEDP, GBMP, and DTPMP were used as chelating agents, it was separately confirmed that the same result as that obtained when CyDTA was used was obtained.
- FIG. 6 is an SEM observation image showing an example of etching results when citric acid is used as a chelating agent. As shown in FIG. 6, the etching rate was insufficient when the citric acid concentration was 0.01 ⁇ M. On the other hand, it was confirmed that a sufficient etching rate was obtained at a citric acid concentration of 0.03 to 1%. However, the etching rate clearly decreased at a citric acid concentration of 1.2 M.
- FIG. 7 is an SEM observation image showing an example of an etching result when a plurality of types of chelating agents are mixed and used. As shown in FIG. 7, it was confirmed that a sufficient etching rate was obtained with “EDTMP + citric acid”, “NTMP + citric acid”, and “HEDP + citric acid”. Moreover, it confirmed separately that the result similar to FIG. 7 was obtained also in the other combination of a chelating agent.
- Etching accuracy As shown in FIGS. 4 to 7, it was confirmed that the SiO 2 etching mask could be processed very cleanly and accurately. The amount of side etching was about 20 to 40% of the film thickness. Further, when the etching selectivity of the KNN thin film / SiO 2 etching mask was investigated using a part of the samples, it was confirmed that an etching selectivity of 60 or more was obtained. Further, it was confirmed that the Pt film serving as the lower electrode was not etched or peeled off, and the lower electrode film 12 could be used as an etching stopper.
- a photoresist pattern 21 is formed on the KNN thin film patterned by wet etching according to the present invention in accordance with the manufacturing process shown in FIG. 2, and a Pt layer (thickness) is formed as an upper electrode film 22 by RF magnetron sputtering. 100 nm) was formed (see FIG. 2 (a)).
- the upper electrode film was formed using a pure Pt target, a substrate temperature of 250 ° C., a discharge power of 200 W, an Ar atmosphere, and a pressure of 2.5 Pa. Thereafter, the photoresist pattern 21 was removed by acetone cleaning (lift-off), and a KNN thin film element was fabricated with the upper electrode film 22 'remaining on the KNN thin film (see FIGS. 2B and 2C).
- a sample was also prepared in which the upper electrode film 22 (Pt layer, thickness of 100 nm) was formed on a KNN thin film that was not patterned by wet etching according to the present invention. This sample was not affected by the ferroelectric thin film etching process at all, and was prepared as a reference sample for the ferroelectric characteristics of the formed KNN thin film.
- FIG. 8 is a graph showing an example of the relationship between the polarization value and the applied voltage in the KNN thin film element fabricated in the present invention and the reference sample.
- the KNN thin film element of FIG. 8 was finely processed with an etching solution using EDTMP. As shown in FIG. 8, it can be said that the hysteresis loop of the polarization value of the KNN thin film element fabricated according to the present invention and the reference sample almost completely coincided with each other, and the polarization characteristics thereof are substantially unchanged.
- the difference between the KNN thin film element fabricated in the present invention and the reference sample was about 1%. This level of difference is within the range of individual sample differences or measurement errors, and can be said to be substantially unchanged. Further, in the leakage current density, the difference is within the range of individual sample difference or measurement error, and it can be said that there is substantially no change.
- the ferroelectric thin film etching process of the present invention can be finely processed without degrading the ferroelectric characteristics of the KNN thin film.
- Etching experiment and etching property evaluation Etching experiment and etching property evaluation were performed in the same manner as the previous KNN thin film device. As a result, it was confirmed that the same etching property as that of the KNN thin film element was obtained.
- an etchant composed of 0.4 M citric acid, 3.5 M ammonia water, and 7.5 M hydrogen peroxide solution was prepared by two methods (volume 2 L each).
- the time required for mixing was measured.
- the time required from the start of mixing and stirring the three reagents to the completion of dissolution of citric acid was about 30 minutes.
- the time required from the start of mixing and stirring of the two solutions to the homogeneous mixing was measured, and was about 30 seconds.
- Etching experiments were conducted with an etching solution B ′ stored for one week after the preparation of the etching solution by a two-component mixing method and an etching solution B ′′ prepared just using a citric acid / ammonia concentrated solution stored for one week.
- the etching solution B ′ could not etch the KNN thin film, but the etching solution B ′′ showed the same etching performance as the etching solutions A and B. From this experiment, the etching solution itself was immediately before the wet etching process. It is preferable to prepare, but it was confirmed that the chelating agent / ammonia concentrated solution is excellent in storage stability.
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Abstract
Description
基板上に下部電極膜を形成する下部電極膜形成工程と、
前記下部電極膜上にニオブ酸系強誘電体薄膜を形成する強誘電体薄膜形成工程と、
前記ニオブ酸系強誘電体薄膜上にエッチングマスクを所望のパターンとなるように形成するエッチングマスクパターン形成工程と、
前記ニオブ酸系強誘電体薄膜に対して所定のキレート剤とアルカリ水溶液と過酸化水素水(H2O2 aq.と略す)とを含むエッチング液を用いたウェットエッチングを行うことによって、前記ニオブ酸系強誘電体薄膜に所望パターンの微細加工を行う強誘電体薄膜エッチング工程とを有し、
前記所定のキレート剤は、エチレンジアミンテトラメチレンホスホン酸(EDTMPと略す)、ニトリロトリス(メチレンホスホン酸)(NTMPと略す)、シクロヘキサンジアミン四酢酸(CyDTAと略す)、1-ヒドロキシエタン-1,1-ジホスホン酸(エチドロン酸)(HEDPと略す)、グリシン-N,N-ビス(メチレンホスホン酸)(GBMPと略す)、ジエチレントリアミンペンタ(メチレンホスホン酸)(DTPMPと略す)、およびクエン酸から選ばれる少なくとも一つであり、前記アルカリ水溶液はアンモニア水溶液(NH3 aq.と略す)を含むことを特徴とするニオブ酸系強誘電体薄膜素子の製造方法を提供する。
(i)前記所定のキレート剤として、EDTMP、NTMP、CyDTA、HEDP、GBMP、またはDTPMPを用いる場合、前記エッチング液中の前記キレート剤のモル濃度は0.001 M(mol/L)以上0.5 M(mol/L)以下であり、前記所定のキレート剤として、クエン酸を用いる場合、前記エッチング液中の前記クエン酸のモル濃度は0.03 M以上1 M以下である。
(ii)前記エッチングマスクは、酸化シリコン(SiO2)膜である。
(iii)前記強誘電体薄膜エッチング工程は、前記エッチング液の温度が50℃以上100℃未満である。
(iv)前記ニオブ酸系強誘電体は、ニオブ酸カリウムナトリウム((K1-xNax)NbO3、KNNと略す)またはニオブ酸リチウム(LiNbO3、LNと略す)である。
(v)前記下部電極膜は、白金(Pt)である。
(vi)前記ニオブ酸系強誘電体薄膜は、結晶系が擬立方晶または正方晶であり主表面が(0 0 1)面に優先配向するようにスパッタ法により形成される。
(vii)前記基板は、その表面に熱酸化膜を有するシリコン(Si)基板である。
(viii)前記製造方法は、所望パターンに微細加工された前記ニオブ酸系強誘電体薄膜上に上部電極を形成する上部電極形成工程と、前記上部電極が形成されたニオブ酸系強誘電体薄膜を具備する前記基板からチップ状のニオブ酸系強誘電体薄膜素子を切り出すダイシング工程とを更に有する。
本工程では、基板11上に下部電極膜12を形成する(図1(a)参照)。下部電極膜12の材料は、特に限定されないが、白金(Pt)又はPtを主成分とする合金を用いることが好ましい。Ptは、後述する強誘電体薄膜エッチング工程で用いるエッチング液に対して不活性であるため、エッチングストッパとして機能することができる。下部電極膜12の形成方法に特段の限定は無いが、例えば、スパッタ法を好適に用いることができる。なお、下部電極膜12は、ニオブ酸系強誘電体薄膜の焦電特性や圧電特性を十分に発揮させるため、算術平均表面粗さRaが0.86 nm以下であることが好ましい。
本工程では、下部電極膜12上にニオブ酸系強誘電体薄膜13を形成する(図1(a)参照)。ニオブ酸系強誘電体の材料としては、KNN((K1-xNax)NbO3、0.4≦ x ≦0.7)を用いることが好ましい。ニオブ酸系強誘電体薄膜13の形成方法としては、KNN焼結体ターゲットを用いたスパッタ法や電子ビーム蒸着法が好ましい。スパッタ法や電子ビーム蒸着法は、成膜再現性、成膜速度及びランニングコストの面で優れていることに加えて、KNN結晶の配向性を制御することが可能であるためである。形成するニオブ酸系強誘電体薄膜13は、KNN結晶の結晶系が擬立方晶または正方晶であり、薄膜の主表面が(0 0 1)面に優先配向されているものが、焦電特性・圧電特性上好ましい。
本工程では、成膜した圧電体薄膜13上に、後述するウェットエッチングに対するエッチングマスクを形成する。まず、フォトリソグラフィプロセスにより、圧電体薄膜13上にフォトレジストパターン14を形成する(図1(b)参照)。次に、フォトレジストパターン14上にエッチングマスク膜15を成膜する(図1(c)参照)。次に、リフトオフプロセスにより、所望のパターンを有するエッチングマスクパターン15’を形成する(図1(d)参照)。
本工程では、ニオブ酸系強誘電体薄膜13に対してウェットエッチングを行い、エッチングマスクパターン15’によって規定されるパターンに微細加工を行う。エッチング液としては、キレート剤とアルカリ水溶液と過酸化水素水とを含みフッ酸を含まないエッチング液を用いることが好ましい。これにより、従来のフッ酸系エッチング液に対して必要とされてきた安全対策コストを低減することができる。
図2は、本発明に係るニオブ酸系強誘電体薄膜素子の製造工程(強誘電体薄膜エッチング工程より後)を示す拡大断面模式図である。本工程では、先の工程によって得られた所望のパターンに微細加工されたニオブ酸系強誘電体薄膜(ニオブ酸系強誘電体薄膜パターン13’)上に上部電極を形成する。まず、フォトリソグラフィプロセスにより、上部電極の形成スペースを残してフォトレジストパターン21を形成し、フォトレジストパターン21上に上部電極膜22を成膜する(図2(a)参照)。次に、リフトオフプロセスにより、上部電極22’を残して他を除去する(図2(b)参照)。上部電極膜22(上部電極22’)の材料としては、例えば、アルミニウム(Al)、金(Au)、ニッケル(Ni)、Pt等を好適に用いることができる。
本工程では、上部電極22’が形成されたニオブ酸系強誘電体薄膜パターン13’を具備する基板からチップ状のニオブ酸系強誘電体薄膜素子20を切り出す(図2(c)参照)。符号11’はチップ状基板を表し、符号12’は下部電極を表す。これにより、所望のパターンに微細加工されたニオブ酸系強誘電体薄膜を具備するニオブ酸系強誘電体薄膜素子20を得ることができる。なお、ダイシング工程が行われるタイミングには特段の限定はなく、製造プロセス全体最適化の観点から適当なタイミングで行われればよい。
[ニオブ酸カリウムナトリウム薄膜素子]
(KNN薄膜積層基板の作製)
図1に示した製造工程に沿って、KNN薄膜積層基板を作製した。基板11としては、熱酸化膜付きSi基板((1 0 0)面方位の4インチウェハ、ウェハ厚さ0.525 mm、熱酸化膜厚さ200 nm)を用いた。
次に、上記で成膜したKNN薄膜上に、フォトレジスト(東京応化工業株式会社製、OFPR-800)を塗布・露光・現像して、フォトレジストパターン14を形成した(図1(b)参照)。続いて、エッチングマスク膜15として、テトラエトキシシラン(TEOS)原料を用いたプラズマCVD法により、厚さ500 nmのSiO2膜を成膜した(図1(c)参照)。その後、レジスト除去液(関東化学株式会社製、JELKシリーズ)を用いてフォトレジストパターン14を除去し(リフトオフ)、エッチングマスクパターン15’をKNN薄膜上に形成した(図1(d)参照)。
(1)エッチング速度
エッチング速度とエッチング温度(エッチング液温度)との関係を調査した。エッチング液としては、0.1 Mのキレート剤と、3.5 Mのアンモニア水と、7.5 Mの過酸化水素水とを混合したエッチング液を用いた。エッチング液の初期pHは、9.6~9.7であった。エッチング液温度は、70~95℃とした。
エッチング液中のキレート剤濃度の影響について調査した。各種キレート剤濃度を0.0001~1.2 Mの範囲で変化させて、KNN薄膜のエッチング性を評価した。アンモニア水濃度と過酸化水素水濃度とは、先のエッチング液と同じ(それぞれ3.5 M、7.5 M)にした。また、エッチング液温度は85~90℃とし、エッチング時間は30分間とした。なお、30分間のエッチング時間は、先のエッチング速度実験の結果から推定すると、約1.9μm厚さのKNN薄膜が十分にエッチング除去されて下部電極膜12(ここではPt膜)が露出する時間長さである。
エッチング液の水素イオン指数(pH)の影響について調査した。pHの調整は、アンモニア濃度と塩酸濃度と水酸化ナトリウム濃度との制御によって行った。エッチング液のその他の成分は、0.1 MのEDTMPと7.5 Mの過酸化水素水とした。その結果、pH範囲8~10でエッチング速度に対する影響が小さく、pHが7.5未満および12超になるとエッチング速度が明確に低下することが確認された。
エッチング液中の過酸化水素濃度の影響について調査した。エッチング液のその他の成分は、0.1 Mの EDTMPと3.5 Mのアンモニア水とした。その結果、4~9 Mの過酸化水素濃度でエッチング速度に対する影響が小さく、過酸化水素濃度が4 M未満になるとエッチング速度が明確に低下することが確認された。
図4~7に示したように、SiO2系エッチングマスクに対して非常にきれいに精度よく加工できていることが確認された。サイドエッチング量は膜厚の20~40%程度であった。また、一部の試料を用いて、KNN薄膜/SiO2系エッチングマスクのエッチング選択比を調査したところ、60以上のエッチング選択比が得られることが確認された。さらに、下部電極となるPt膜のエッチングや剥離などは起こっておらず、下部電極膜12をエッチングストッパとして活用できることが確認された。
本発明のウェットエッチングを施してパターン形成したKNN薄膜上に、図2に示した製造工程に沿って、フォトレジストパターン21を形成し、RFマグネトロンスパッタ法により上部電極膜22としてPt層(厚さ100 nm)を形成した(図2(a)参照)。上部電極膜の成膜条件は、下部電極膜12の場合と同様に、純Ptターゲットを用い、基板温度250℃、放電パワー200 W、Ar雰囲気、圧力2.5 Paとした。その後、アセトン洗浄によりフォトレジストパターン21を除去し(リフトオフ)、上部電極膜22’をKNN薄膜上に残してKNN薄膜素子を作製した(図2(b),(c)参照)。
得られたKNN薄膜素子に対して、強誘電体特性評価システムを用いて分極特性と誘電率とリーク電流密度とを測定した。図8は、本発明で作製したKNN薄膜素子および基準試料における分極値と印加電圧との関係例を示したグラフである。図8のKNN薄膜素子は、EDTMPを用いたエッチング液で微細加工した。図8に示したように、本発明で作製したKNN薄膜素子と基準試料とは、分極値のヒステリシスループがほぼ完全に一致し、その分極特性において実質的に変化なしと言えた。
[ニオブ酸リチウム薄膜素子]
(LN基板の用意)
ここでは、実験の簡便化のため、ニオブ酸リチウム(LiNbO3、LN)の単結晶基板(10 mm×10 mm×0.5 mm)を用意した。先のKNN薄膜積層基板の場合と同様に、用意したLN単結晶基板上にフォトレジストパターン14を形成し、続いて、エッチングマスク膜15として厚さ500 nmのSiO2膜を、TEOS原料を用いたプラズマCVD法により成膜した。次に、リフトオフによりエッチングマスクパターン15’を形成した。
先のKNN薄膜素子と同様にエッチング実験およびエッチング性評価を行った。その結果、KNN薄膜素子と同様のエッチング性が得られることが確認された。
[エッチング液準備方法の検討]
強誘電体薄膜エッチング工程における作業効率の向上を目指して、エッチング液準備方法の検討を行った。エッチングする強誘電体薄膜としては、先の検討1と同じKNN薄膜積層基板を用いた。
エッチング液としては、0.4 Mのクエン酸と、3.5 Mのアンモニア水と、7.5 Mの過酸化水素水とからなるエッチング液を二種類の方法で調合した(それぞれ容積2 L)。ひとつは、当該三試薬を一遍に混合する三試薬混合方式によって調合した(エッチング液Aと称す)。もう一つは、過酸化水素水に対して、あらかじめ別途用意したクエン酸/アンモニア濃厚溶液(クエン酸1.43 M/アンモニア12.5 M)を添加混合する二液混合方式によって調合した(エッチング液Bと称す)。
Claims (9)
- ニオブ酸系強誘電体薄膜素子の製造方法であって、
基板上に下部電極膜を形成する下部電極膜形成工程と、
前記下部電極膜上にニオブ酸系強誘電体薄膜を形成する強誘電体薄膜形成工程と、
前記ニオブ酸系強誘電体薄膜上にエッチングマスクを所望のパターンとなるように形成するエッチングマスクパターン形成工程と、
前記ニオブ酸系強誘電体薄膜に対して所定のキレート剤とアルカリ水溶液と過酸化水素水とを含むエッチング液を用いたウェットエッチングを行うことによって、前記ニオブ酸系強誘電体薄膜に所望パターンの微細加工を行う強誘電体薄膜エッチング工程とを有し、
前記所定のキレート剤は、エチレンジアミンテトラメチレンホスホン酸、ニトリロトリス(メチレンホスホン酸)、シクロヘキサンジアミン四酢酸、1-ヒドロキシエタン-1,1-ジホスホン酸(エチドロン酸)、グリシン-N,N-ビス(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチレンホスホン酸)、およびクエン酸から選ばれる少なくとも一つであり、
前記アルカリ水溶液はアンモニア水溶液を含むことを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1に記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記所定のキレート剤として、エチレンジアミンテトラメチレンホスホン酸、ニトリロトリス(メチレンホスホン酸)、シクロヘキサンジアミン四酢酸、1-ヒドロキシエタン-1,1-ジホスホン酸(エチドロン酸)、グリシン-N,N-ビス(メチレンホスホン酸)、またはジエチレントリアミンペンタ(メチレンホスホン酸)を用いる場合、前記エッチング液中の前記キレート剤のモル濃度は0.001 M以上0.5 M以下であり、
前記所定のキレート剤として、クエン酸を用いる場合、前記エッチング液中の前記クエン酸のモル濃度は0.03 M以上1 M以下であることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1又は請求項2に記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記エッチングマスクは、酸化シリコン膜であることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1乃至請求項3のいずれかに記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記強誘電体薄膜エッチング工程は、前記エッチング液の温度が50℃以上100℃未満であることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1乃至請求項4のいずれかに記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記ニオブ酸系強誘電体は、ニオブ酸カリウムナトリウムまたはニオブ酸リチウムであることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1乃至請求項5のいずれかに記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記下部電極膜は、白金であることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1乃至請求項6のいずれかに記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記ニオブ酸系強誘電体薄膜は、結晶系が擬立方晶または正方晶であり主表面が(0 0 1)面に優先配向するようにスパッタ法により形成されることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1乃至請求項7のいずれかに記載のニオブ酸系強誘電体薄膜素子の製造方法において、
前記基板は、その表面に熱酸化膜を有するシリコン基板であることを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。 - 請求項1乃至請求項8のいずれかに記載のニオブ酸系強誘電体薄膜素子の製造方法において、
所望パターンに微細加工された前記ニオブ酸系強誘電体薄膜上に上部電極を形成する上部電極形成工程と、
前記上部電極が形成されたニオブ酸系強誘電体薄膜を具備する前記基板からチップ状のニオブ酸系強誘電体薄膜素子を切り出すダイシング工程とを更に有することを特徴とするニオブ酸系強誘電体薄膜素子の製造方法。
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US20190115525A1 (en) | 2019-04-18 |
EP3255689B1 (en) | 2019-12-04 |
US10199564B2 (en) | 2019-02-05 |
US10658569B2 (en) | 2020-05-19 |
TW201634395A (zh) | 2016-10-01 |
JPWO2016125579A1 (ja) | 2017-11-16 |
EP3255689A1 (en) | 2017-12-13 |
EP3255689A4 (en) | 2018-10-03 |
US20180026176A1 (en) | 2018-01-25 |
JP6715780B2 (ja) | 2020-07-01 |
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