JP3937174B2 - 強誘電体膜、強誘電体膜の製造方法、強誘電体キャパシタ、強誘電体メモリおよび圧電素子 - Google Patents
強誘電体膜、強誘電体膜の製造方法、強誘電体キャパシタ、強誘電体メモリおよび圧電素子 Download PDFInfo
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- JP3937174B2 JP3937174B2 JP2004082543A JP2004082543A JP3937174B2 JP 3937174 B2 JP3937174 B2 JP 3937174B2 JP 2004082543 A JP2004082543 A JP 2004082543A JP 2004082543 A JP2004082543 A JP 2004082543A JP 3937174 B2 JP3937174 B2 JP 3937174B2
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- ferroelectric
- ferroelectric film
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- 238000004519 manufacturing process Methods 0.000 title claims description 40
- 239000003990 capacitor Substances 0.000 title claims description 24
- 238000000034 method Methods 0.000 claims description 55
- 238000004070 electrodeposition Methods 0.000 claims description 31
- 239000010410 layer Substances 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 23
- 239000012792 core layer Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 238000001652 electrophoretic deposition Methods 0.000 claims description 6
- 230000003301 hydrolyzing effect Effects 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 239000010408 film Substances 0.000 description 119
- 239000000499 gel Substances 0.000 description 65
- 239000007864 aqueous solution Substances 0.000 description 20
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 17
- 239000000243 solution Substances 0.000 description 14
- 239000006185 dispersion Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000000059 patterning Methods 0.000 description 7
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- MUXOBHXGJLMRAB-UHFFFAOYSA-N Dimethyl succinate Chemical compound COC(=O)CCC(=O)OC MUXOBHXGJLMRAB-UHFFFAOYSA-N 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000005012 migration Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 2
- 229910004356 Ti Raw Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000004703 alkoxides Chemical class 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- -1 organic acid salt Chemical class 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- YUTUUOJFXIMELV-UHFFFAOYSA-N 2-Hydroxy-2-(2-methoxy-2-oxoethyl)butanedioic acid Chemical compound COC(=O)CC(O)(C(O)=O)CC(O)=O YUTUUOJFXIMELV-UHFFFAOYSA-N 0.000 description 1
- BFSVOASYOCHEOV-UHFFFAOYSA-N 2-diethylaminoethanol Chemical compound CCN(CC)CCO BFSVOASYOCHEOV-UHFFFAOYSA-N 0.000 description 1
- 229940013085 2-diethylaminoethanol Drugs 0.000 description 1
- BLFRQYKZFKYQLO-UHFFFAOYSA-N 4-aminobutan-1-ol Chemical compound NCCCCO BLFRQYKZFKYQLO-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- HCVBQXINVUFVCE-UHFFFAOYSA-N Citronensaeure-beta-methylester Natural products COC(=O)C(O)(CC(O)=O)CC(O)=O HCVBQXINVUFVCE-UHFFFAOYSA-N 0.000 description 1
- DKMROQRQHGEIOW-UHFFFAOYSA-N Diethyl succinate Chemical compound CCOC(=O)CCC(=O)OCC DKMROQRQHGEIOW-UHFFFAOYSA-N 0.000 description 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 1
- 229910018250 LaSi Inorganic materials 0.000 description 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 1
- 229910004121 SrRuO Inorganic materials 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H10N30/077—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 liquid phase deposition
- H10N30/078—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 liquid phase deposition by sol-gel deposition
-
- 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
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31691—Inorganic layers composed of oxides or glassy oxides or oxide based glass with perovskite structure
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
-
- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02197—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides the material having a perovskite structure, e.g. BaTiO3
-
- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02282—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process liquid deposition, e.g. spin-coating, sol-gel techniques, spray coating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Semiconductor Memories (AREA)
- Formation Of Insulating Films (AREA)
- Inorganic Insulating Materials (AREA)
Description
ゾルゲル原料を含む溶液において、該ゾルゲル原料を加水分解・重縮合することによって粒子状ゲルが分散された液を形成する工程と、
前記粒子状ゲルを含む液を用いて、該粒子状ゲルを泳動電着法により電極上に電着させて強誘電体膜を形成する工程と、
を含む。
本実施の形態にかかる強誘電体膜の製造方法について説明する。図1〜3は、本実施の形態にかかる強誘電体膜の製造方法を模式的に示す図である。強誘電体膜としては、特に限定されず、たとえば、ペロブスカイト構造を有する強誘電体膜(たとえば、PbZrTiO系)や層状ペロブスカイト構造を有する強誘電体膜(たとえば、BiLaTiO系、BiTiO系、SrBiTaO系)などがあげられる。
本実施例では、PbZrTiO系(以下、「PZT系」という)強誘電体膜を作製した。
本実施の形態にかかる強誘電体膜の製造方法は、この強誘電体膜を用いた強誘電体メモリや圧電素子の製造方法に適用することができる。以下では、一例として本実施の形態にかかる強誘電体膜の製造方法を単純マトリクス型(クロスポイント型)の強誘電体メモリの製造方法へ適用した場合について説明する。
Claims (9)
- ゾルゲル原料を含む溶液において、該ゾルゲル原料を加水分解・重縮合することによって粒子状ゲルが分散された液を形成する工程と、
前記粒子状ゲルを含む液を用いて、該粒子状ゲルを泳動電着法により電極上に電着させて強誘電体膜を形成する工程と、を含み、
前記電極上には、あらかじめ強誘電体初期核層が形成されている、強誘電体膜の製造方法。 - 請求項1において、
さらに、前記強誘電体膜を熱処理する工程を有する、強誘電体膜の製造方法。 - 請求項1または2において、
前記強誘電体初期核層は、強誘電体原料の溶液を用いて、水熱電着法により前記電極上に形成される、強誘電体膜の製造方法。 - 請求項1ないし3のいずれかにおいて、
前記強誘電体初期核層は島状に形成される、強誘電体膜の製造方法。 - 請求項1ないし4のいずれかにおいて、
前記粒子状ゲルを形成する工程において、酸性または塩基性触媒を用いる、強誘電体膜の製造方法。 - 請求項1ないし5に記載の製造方法により形成された、強誘電体膜。
- 請求項6に記載の強誘電体膜を有する、強誘電体キャパシタ。
- 請求項6に記載の強誘電体膜を有する、強誘電体メモリ。
- 請求項6に記載の強誘電体膜を有する、圧電素子。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004082543A JP3937174B2 (ja) | 2004-03-22 | 2004-03-22 | 強誘電体膜、強誘電体膜の製造方法、強誘電体キャパシタ、強誘電体メモリおよび圧電素子 |
US11/085,603 US7419579B2 (en) | 2004-03-22 | 2005-03-21 | Method for manufacturing a ferroelectric film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004082543A JP3937174B2 (ja) | 2004-03-22 | 2004-03-22 | 強誘電体膜、強誘電体膜の製造方法、強誘電体キャパシタ、強誘電体メモリおよび圧電素子 |
Publications (2)
Publication Number | Publication Date |
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JP2005268702A JP2005268702A (ja) | 2005-09-29 |
JP3937174B2 true JP3937174B2 (ja) | 2007-06-27 |
Family
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Family Applications (1)
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JP2004082543A Expired - Lifetime JP3937174B2 (ja) | 2004-03-22 | 2004-03-22 | 強誘電体膜、強誘電体膜の製造方法、強誘電体キャパシタ、強誘電体メモリおよび圧電素子 |
Country Status (2)
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US (1) | US7419579B2 (ja) |
JP (1) | JP3937174B2 (ja) |
Families Citing this family (1)
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JP2014175389A (ja) * | 2013-03-07 | 2014-09-22 | Mitsubishi Materials Corp | アルミナ絶縁膜の形成方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS5818916A (ja) | 1981-07-27 | 1983-02-03 | ソニー株式会社 | 焦電体の製造方法 |
NL8220244A (nl) * | 1981-07-27 | 1983-06-01 | Sony Corp | Werkwijze ter bereiding van een pyroelektrisch materiaal. |
JPS63110681A (ja) | 1986-10-28 | 1988-05-16 | Nec Corp | 圧電セラミツクス部品の製造方法 |
JPS63277517A (ja) | 1987-05-11 | 1988-11-15 | Nippon Steel Corp | 複合ペロブスカイト化合物前駆体ゾルの製造方法 |
JP2911186B2 (ja) * | 1989-07-10 | 1999-06-23 | 科学技術振興事業団 | 複合酸化物薄膜 |
JPH0578103A (ja) | 1991-04-30 | 1993-03-30 | Ricoh Co Ltd | 厚膜無機酸化物 |
JP2511236B2 (ja) | 1993-04-19 | 1996-06-26 | 株式会社日本アルミ | 溶射皮膜の封孔処理方法及び皮膜複合体 |
JPH0891841A (ja) | 1994-09-27 | 1996-04-09 | Sharp Corp | 強誘電体膜の製造方法 |
JPH10102294A (ja) | 1996-09-30 | 1998-04-21 | Minolta Co Ltd | 金属酸化物膜及びその製造方法 |
JP2000150295A (ja) | 1998-11-17 | 2000-05-30 | Hokuriku Electric Ind Co Ltd | コンデンサ及びその製造方法 |
JP3682839B2 (ja) | 1999-02-19 | 2005-08-17 | セイコーエプソン株式会社 | 圧電体素子、インクジェット式記録ヘッド、プリンタおよび圧電体素子の製造方法 |
US6127283A (en) * | 1999-11-02 | 2000-10-03 | Cerel (Ceramic Technologies) Ltd. | Method of electrophoretic deposition of ferroelectric films using a trifunctional additive and compositions for effecting same |
US6562678B1 (en) * | 2000-03-07 | 2003-05-13 | Symetrix Corporation | Chemical vapor deposition process for fabricating layered superlattice materials |
JP2002275390A (ja) | 2001-03-15 | 2002-09-25 | Fukuoka Prefecture | 結晶性ゲル分散コーティング溶液及び結晶性ゲル分散コーティング溶液を用いた薄膜形成方法 |
US20050057884A1 (en) * | 2003-09-03 | 2005-03-17 | Jsr Corporation | Dielectric-forming composition containing particles with perovskite crystal structure, production process and uses of the same, and process for preparing crystal particles having perovskite crystal structure |
JP2005075714A (ja) | 2003-09-03 | 2005-03-24 | Jsr Corp | ペロブスカイト型結晶粒子の製造方法 |
JP4632018B2 (ja) | 2003-10-15 | 2011-02-16 | セイコーエプソン株式会社 | 強誘電体膜、強誘電体膜の製造方法、および強誘電体キャパシタ、ならびに強誘電体メモリ |
JP4603254B2 (ja) | 2003-10-23 | 2010-12-22 | 日本曹達株式会社 | 金属酸化物ゾル液の製造方法、結晶質金属複酸化物ゾルおよび金属酸化物膜 |
-
2004
- 2004-03-22 JP JP2004082543A patent/JP3937174B2/ja not_active Expired - Lifetime
-
2005
- 2005-03-21 US US11/085,603 patent/US7419579B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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US7419579B2 (en) | 2008-09-02 |
US20050208209A1 (en) | 2005-09-22 |
JP2005268702A (ja) | 2005-09-29 |
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