JP2010226035A - 誘電体素子及び誘電体素子の製造方法 - Google Patents
誘電体素子及び誘電体素子の製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 105
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 72
- 150000004706 metal oxides Chemical group 0.000 claims abstract description 72
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 1
- 239000011888 foil Substances 0.000 abstract description 15
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000010409 thin film Substances 0.000 description 21
- 239000003990 capacitor Substances 0.000 description 19
- 239000010408 film Substances 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052762 osmium Inorganic materials 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052702 rhenium Inorganic materials 0.000 description 2
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 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
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
【解決手段】誘電体素子10は、金属からなる基板12と基板12の表面上に積層された酸化物誘電体層14とを備え、基板10の表面は島状に分布する金属酸化物領域16を有し、酸化物誘電体層14は金属酸化物領域16を介して基板12と密着する。基板12の表面に島状に分布する金属酸化物領域16を介して基板12と酸化物誘電体層14とが密着した領域の密着性が高いため、誘電体素子10の基板12と酸化物誘電体層14との密着性が高められる。また、金属箔上に凹凸を形成する場合と比較して、金属酸化物領域16と基板12とによる凹凸の形成が抑制されるため、この凹凸によるリーク特性の劣化を抑制することができる。
【選択図】図1
Description
図1は本発明の好適な実施形態に係る誘電体素子10の断面図である。図1に示すように、誘電体素子10は、金属からなる基板12と、基板12の上部に積層された酸化物誘電体層14と、基板12の表面において島状に分布する金属酸化物領域16と、を含んで構成される。
次に、本実施形態に係る誘電体素子10の製造方法を、図3及び図4を用いて説明する。図3は、誘電体素子10の製造方法を説明するシーケンス図であり、図4は、誘電体素子10の製造方法を説明する断面図である。
図1に示す誘電体素子10及び図6に示す構造を有する薄膜コンデンサ30を以下の方法により作製した。まず、金属箔として膜厚30μmのNi箔を用い、Ni箔の表面の整面処理をCMPにより行った。次に、このNi箔を基板12とし、その表面上にスピンコートを用いてBaTiO3溶液を塗布し誘電体膜14aを形成した。このときの溶液濃度は0.6M/Lであり、回転数は3000rpmであった。溶液の塗布後、120℃に加熱されたホットプレート上で1分間加熱することにより、この溶液を乾燥させた。
第1工程の大気雰囲気下における熱処理における熱処理温度及び処理時間をそれぞれ表1に示す数値に変更したほかは、実施例1の誘電体素子及び薄膜コンデンサと同様の方法により、実施例2〜6及び比較例1の誘電体素子及び薄膜コンデンサを得た。
実施例1〜6及び比較例1の誘電体素子の上部に積層された酸化物誘電体層を、エッチャントにより除去した。その後、基板表面をSEMにより観察し、画像処理により、基板表面の所定の面積中の金属酸化物領域の面積を測定し、金属酸化物領域の占有率(S0に対するS1の割合)を求めた。
実施例1〜6及び比較例1の誘電体素子を用いて、密着性を計測した。この計測は、RHESCA社の超薄膜スクラッチ試験機(型式:CSR−02)を用いてスクラッチ法により行った。公知のように、スクラッチ法は、一定の曲率半径を有する硬い圧子を、計測すべき膜の表面に押し付け、圧子に加える荷重を増加させつつ膜の表面をひっかき、膜の破壊(例えば、下地材からの膜の剥離)が発生する荷重値を測定した。この荷重値は「臨界剥離荷重値」と呼ばれるものである。
実施例1〜6及び比較例1の薄膜コンデンサを用いて、電気的特性として、容量密度(C/A)、リーク特性、及び誘電損失を計測した。なお、容量密度は、(薄膜コンデンサ30の静電容量)/(電極18の面積)で定義される。また、リーク特性は、室温の下で薄膜コンデンサ30の下部電極(すなわち、基材12)および上部電極18間に3Vの電圧を印加したときに発生するリーク電流の電流密度を示す。また、容量、誘電損失は、LCRメーター(HP4284A)により、室温25℃において1kHz−1Vrmsの条件で測定を行った。
実施例1〜6及び比較例1の誘電体素子及び薄膜コンデンサの製造時条件及び評価結果を表1に示す。
Claims (5)
- 金属からなる基板と前記基板の表面上に積層された酸化物誘電体層とを備える誘電体素子において、
前記基板の前記表面は島状に分布する金属酸化物領域を有し、前記酸化物誘電体層は前記金属酸化物領域を介して前記基板と密着していることを特徴とする誘電体素子。 - 前記金属酸化物領域は、前記基板を構成する金属が酸化することにより形成されたものである請求項1記載の誘電体素子。
- 前記金属酸化物領域と前記酸化物誘電体層との界面の面積をS1とし、前記基板と前記酸化物誘電体層との界面の面積をS0としたとき、S0に対するS1の割合が2〜40%である請求項1又は2記載の誘電体素子。
- 金属からなる基板の表面上に酸化物誘電層を積層した積層体を形成する積層工程と、
前記基板と前記酸化物誘電体層との界面における前記基板の前記表面上の一部領域を酸化させることにより、島状に分布する金属酸化物領域を形成する金属酸化物領域形成工程と、
を有する誘電体素子の製造方法。 - 前記金属酸化物領域形成工程は、
前記積層体を大気中で熱処理する第1工程と、
前記第1工程後、前記積層体を真空雰囲気下で熱処理する第2工程と、
を有する請求項4記載の誘電体素子の製造方法。
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JP2007194592A (ja) * | 2005-12-20 | 2007-08-02 | Tdk Corp | 誘電体素子とその製造方法 |
JP2007235024A (ja) * | 2006-03-03 | 2007-09-13 | Tdk Corp | 酸化物誘電体膜の形成方法 |
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JP2003188432A (ja) * | 2001-12-18 | 2003-07-04 | Matsushita Electric Ind Co Ltd | 圧電素子及びその製造方法、並びに圧電素子を備えたインクジエツトヘツド及びインクジエツト式記録装置 |
JP2007066754A (ja) * | 2005-08-31 | 2007-03-15 | Tdk Corp | 誘電体膜及びその製造方法 |
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JP2007235024A (ja) * | 2006-03-03 | 2007-09-13 | Tdk Corp | 酸化物誘電体膜の形成方法 |
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