JP7310550B2 - 誘電体膜、誘電体素子および電子回路基板 - Google Patents
誘電体膜、誘電体素子および電子回路基板 Download PDFInfo
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- JP7310550B2 JP7310550B2 JP2019199391A JP2019199391A JP7310550B2 JP 7310550 B2 JP7310550 B2 JP 7310550B2 JP 2019199391 A JP2019199391 A JP 2019199391A JP 2019199391 A JP2019199391 A JP 2019199391A JP 7310550 B2 JP7310550 B2 JP 7310550B2
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- dielectric film
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- thin film
- composite oxide
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- 239000002131 composite material Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 28
- 238000002441 X-ray diffraction Methods 0.000 claims description 12
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims 2
- 229910052593 corundum Inorganic materials 0.000 claims 1
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 239000010408 film Substances 0.000 description 118
- 239000003990 capacitor Substances 0.000 description 74
- 239000010409 thin film Substances 0.000 description 71
- 239000000758 substrate Substances 0.000 description 56
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- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 20
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- 238000005259 measurement Methods 0.000 description 6
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
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- 239000010936 titanium Substances 0.000 description 5
- LTPBRCUWZOMYOC-UHFFFAOYSA-N Beryllium oxide Chemical compound O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
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- 239000000956 alloy Substances 0.000 description 4
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- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- -1 V 2 O 5 Inorganic materials 0.000 description 3
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 229910001935 vanadium oxide Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910006404 SnO 2 Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
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- 238000000605 extraction Methods 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 2
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- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 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
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
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- 238000003825 pressing Methods 0.000 description 2
- 238000004549 pulsed laser deposition Methods 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
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- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 238000003746 solid phase reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910002367 SrTiO Inorganic materials 0.000 description 1
- 229910002370 SrTiO3 Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910003134 ZrOx Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- VAWSWDPVUFTPQO-UHFFFAOYSA-N calcium strontium Chemical compound [Ca].[Sr] VAWSWDPVUFTPQO-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000224 chemical solution deposition Methods 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
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- 229910052681 coesite Inorganic materials 0.000 description 1
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- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
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- 239000002241 glass-ceramic Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
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- 238000010884 ion-beam technique Methods 0.000 description 1
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- 229910052863 mullite Inorganic materials 0.000 description 1
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- 235000009566 rice Nutrition 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- 238000003980 solgel method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C14/081—Oxides of aluminium, magnesium or beryllium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/003—Titanates
- C01G23/006—Alkaline earth titanates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C14/083—Oxides of refractory metals or yttrium
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- C—CHEMISTRY; METALLURGY
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- 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
- C23C14/088—Oxides of the type ABO3 with A representing alkali, alkaline earth metal or Pb and B representing a refractory or rare earth metal
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- C—CHEMISTRY; METALLURGY
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- 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
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
- C23C14/3414—Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/409—Oxides of the type ABO3 with A representing alkali, alkaline earth metal or lead and B representing a refractory metal, nickel, scandium or a lanthanide
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
- H05K1/0231—Capacitors or dielectric substances
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/162—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed capacitors
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
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Description
[1]一般式(Sr1-xCax)yTiO3で表される複合酸化物を主成分として有する誘電体膜であって、
xおよびyが、0.40≦x≦0.90、0.90≦y≦1.10である関係を満足し、
誘電体膜のX線回折チャートにおいて、複合酸化物の(0,0,4)面の回折ピーク強度に対する複合酸化物の(1,1,2)面の回折ピーク強度の比が3.00以上である誘電体膜である。
xおよびyが、0.40≦x≦0.90、0.90≦y≦1.10である関係を満足し、
Cu-Kα線をX線源とするX線回折測定により得られる誘電体膜のX線回折チャートにおいて、回折角2θが46°以上48°以下の範囲に現れる回折ピーク強度に対する回折角2θが32°以上34°以下の範囲に現れる回折ピーク強度の比が3.00以上である誘電体膜である。
1.薄膜コンデンサ
1.1.薄膜コンデンサの全体構成
1.2.誘電体膜
1.2.1.複合酸化物
1.3.基板
1.4.第1の電極
1.5.第2の電極
2.薄膜コンデンサの製造方法
3.電子回路基板
4.本実施形態のまとめ
5.変形例
まず、本実施形態に係る誘電体素子として、薄膜状の誘電体膜を有する薄膜コンデンサについて説明する。
図1に示すように、本実施形態に係る誘電体素子の一例としての薄膜コンデンサ100は、基板10と、第1の電極30と、誘電体膜40と、第2の電極50とがこの順序で積層された構成を有している。第1の電極30および第2の電極50が外部回路に接続されて電圧が印加されると、誘電体膜40が所定の静電容量を示し、コンデンサとしての機能を発揮することができる。各構成要素についての詳細な説明は後述する。なお、第1の電極と第2の電極とが異なる材質である場合には、薄膜コンデンサの上下方向を区別するために、一方の電極を上部電極、他方の電極を下部電極としてもよい。
誘電体膜40は、後述する複合酸化物を主成分として含んでいる。本実施形態では、当該複合酸化物は、誘電体膜100モル%中95モル%以上を占める成分であり、97モル%以上を占める成分であることが好ましい。
上記の複合酸化物は、ストロンチウム(Sr)、カルシウム(Ca)およびチタン(Ti)を含む酸化物である。本実施形態では、複合酸化物は、一般式(Sr1-xCax)yTiO3で表され、ペロブスカイト構造を有している。
図1に示す基板10は、化学的、熱的に安定で応力発生が少なく、表面の平滑性を保つことができる材料で構成されていれば特に限定されない。たとえば、Si単結晶、サファイア単結晶、SrTiO3単結晶、MgO単結晶等から構成される単結晶基板;アルミナ(Al2O3)、マグネシア(MgO)、フォルステライト(2MgO・SiO2)、ステアタイト(MgO・SiO2)、ムライト(3Al2O3・2SiO2)、ベリリア(BeO)、ジルコニア(ZrO2)、窒化アルミニウム(AlN)、窒化シリコン(Si3N4)、炭化シリコン(SiC)等から構成されるセラミック多結晶基板;1000℃以下で焼成して得たアルミナ(結晶相)と酸化ケイ素(ガラス相)等からなるガラスセラミックス基板(LTCC基板);石英ガラス等のガラス基板;Fe-Ni合金等から構成される金属基板が例示される。また、ニッケル(Ni)もしくは銅(Cu)からなる金属箔でも良い。このような金属箔は、後述する下部電極を兼ねることができ、薄膜コンデンサを電子回路基板に実装することが容易となる。したがって、これらを用いることで薄膜コンデンサの更なる薄膜化や、基板コストの削減に寄与できる。本実施形態では、基板表面の平滑性が良好なSi単結晶を基板として用いる。
図1に示すように、基板10の上には、絶縁層20を介して、下部電極30が薄膜状に形成されている。下部電極30は、後述する上部電極50とともに誘電体膜40を挟み、コンデンサとして機能させるための電極である。下部電極30を構成する材料は、導電性を有する材料であれば特に制限されない。たとえば、Au、Pt、Ag、Ir、Ru、Co、Ni、Fe、Cu、Al等の金属、または、これらの合金;Si、GaAs、GaP、InP、SiC等の半導体;ITO、ZnO、SnO2等の導電性金属酸化物が例示される。
図1に示すように、誘電体膜40の表面には、上部電極50が薄膜状に形成されている。上部電極50は、上述した下部電極30とともに、誘電体膜40を挟み、コンデンサとして機能させるための電極である。したがって、第2の電極50は、第1の電極30とは異なる極性を有している。
次に、図1に示す薄膜コンデンサ100の製造方法の一例について以下に説明する。
本実施形態に係る電子回路基板は、上記の誘電体膜を備える。電子回路基板は、上記の誘電体膜を含む薄膜コンデンサなどの電子部品を備えてもよい。薄膜コンデンサ等の電子部品は、電子回路基板の表面に設置されていてよい。薄膜コンデンサ等の電子部品は、電子回路基板内に埋め込まれていてもよい。電子回路基板に備えられる薄膜コンデンサは、基板および第1の電極(下部電極)として、金属箔を有していることが好ましい。
本実施形態では、成膜法により得られる誘電体膜の主成分として、ストロンチウムとカルシウムとチタンとの複合酸化物に着目している。
上述した実施形態では、本実施形態に係る誘電体膜のみを有する誘電体素子(薄膜コンデンサ)を説明したが、本実施形態に係る誘電体素子は、本実施形態に係る誘電体膜と別の誘電体膜とを組み合わせた積層構造を有していてもよい。たとえば、既存のSi3Nx、SiOx、Al2Ox、ZrOx、Ta2Ox等のアモルファス誘電体膜や結晶膜との積層構造とすることで、誘電体膜のインピーダンスや比誘電率の温度変化を調整することが可能となる。
まず、誘電体膜の形成に必要なターゲットを以下のようにして作製した。
誘電体膜に対してXRD測定を行い、X線回折チャートを得た。得られたX線回折チャートにおいて、ペロブスカイト構造を有する複合酸化物の(1,1,2)面の回折ピークの強度I(112)と、(0,0,4)面の回折ピークの強度I(004)と、を算出し、I(112)/I(004)を算出した。結果を表1に示す。
誘電体膜の組成が表2に示す組成となるように、ターゲットの原料粉末を秤量して、ターゲットを作製し、成膜時の基板温度および成膜後のアニール温度を表2に示す温度とした以外は、実験1と同じ方法により、薄膜コンデンサ試料を作製した。また、作製した薄膜コンデンサ試料に対して、実験1と同じ評価を行った。結果を表2に示す。
ターゲットの原料粉末として、酸化マンガン(MnO)、酸化バナジウム(V2O5)、酸化アルミニウム(Al2O3)および酸化ニオブ(Nb2O3)の各粉末を準備した。これらの粉末は誘電体膜の副成分として含まれることになる。誘電体膜の組成が表3に示す組成となるように、ターゲットの原料粉末を秤量して、ターゲットを作製し、成膜時の基板温度および成膜後のアニール温度を表3に示す温度とした以外は、実験1と同じ方法により、薄膜コンデンサ試料を作製した。また、作製した薄膜コンデンサ試料に対して、実験1と同じ評価を行った。結果を表3に示す。
10… 基板
30… 第1の電極
40… 誘電体膜
50… 第2の電極
90… 電子回路基板
91… 薄膜コンデンサ
30… 下部電極
40… 誘電体膜
50… 上部電極
92… エポキシ系樹脂基板
93… 樹脂層
94… 絶縁性被覆層
95… 電子部品
96… 金属配線
Claims (9)
- 一般式(Sr1-xCax)yTiO3で表される複合酸化物を主成分として有する誘電体膜であって、
xおよびyが、0.40≦x≦0.90、0.90≦y≦1.10である関係を満足し、
前記誘電体膜のX線回折チャートにおいて、前記複合酸化物の(0,0,4)面の回折ピーク強度に対する前記複合酸化物の(1,1,2)面の回折ピーク強度の比が3.00以上である誘電体膜。 - 前記複合酸化物の(0,0,4)面の回折ピーク強度に対する前記複合酸化物の(1,1,2)面の回折ピーク強度の比が5.00以上である請求項1に記載の誘電体膜。
- 一般式(Sr1-xCax)yTiO3で表される複合酸化物を主成分として有する誘電体膜であって、
xおよびyが、0.40≦x≦0.90、0.90≦y≦1.10である関係を満足し、
Cu-Kα線をX線源とするX線回折測定により得られる前記誘電体膜のX線回折チャートにおいて、回折角2θが46°以上48°以下の範囲に現れる回折ピーク強度に対する回折角2θが32°以上34°以下の範囲に現れる回折ピーク強度の比が3.00以上である誘電体膜。 - 回折角2θが46°以上48°以下の範囲に現れる回折ピーク強度に対する回折角2θが32°以上34°以下の範囲に現れる回折ピーク強度の比が5.00以上である請求項3に記載の誘電体膜。
- 前記誘電体膜は、MnO、V2O5、Al2O3およびNb2O5からなる群から選ばれる少なくとも1つを副成分として有する請求項1から4のいずれかに記載の誘電体膜。
- 前記誘電体膜は、前記MnOを有し、前記複合酸化物100モルに対して、前記MnOの含有量が0.010モル以上2.000モル以下である請求項5に記載の誘電体膜。
- 前記誘電体膜は、前記V2O5を有し、前記複合酸化物100モルに対して、前記V2O5の含有量が0.050モル以上3.000モル以下である請求項5または6に記載の誘電体膜。
- 請求項1から7のいずれかに記載の誘電体膜と、電極とを備える誘電体素子。
- 請求項8に記載の誘電体素子が搭載されている電子回路基板。
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