JP2009177171A - 誘電体薄膜とその製造方法および用途 - Google Patents
誘電体薄膜とその製造方法および用途 Download PDFInfo
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- 239000011164 primary particle Substances 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 230000000630 rising effect Effects 0.000 claims abstract description 3
- 239000010409 thin film Substances 0.000 claims description 119
- 239000003990 capacitor Substances 0.000 claims description 27
- 239000010936 titanium Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 19
- 239000013078 crystal Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
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- 239000002131 composite material Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 239000012212 insulator Substances 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 5
- 150000001553 barium compounds Chemical class 0.000 claims description 4
- 238000002161 passivation Methods 0.000 claims description 4
- 150000003438 strontium compounds Chemical class 0.000 claims description 4
- -1 titanium alkoxide Chemical class 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 10
- 239000010408 film Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 9
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- 229910052788 barium Inorganic materials 0.000 description 7
- 238000000635 electron micrograph Methods 0.000 description 7
- 238000010304 firing Methods 0.000 description 7
- 229910052712 strontium Inorganic materials 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000003989 dielectric material Substances 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 238000001354 calcination Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 150000004703 alkoxides Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
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- 238000003980 solgel method Methods 0.000 description 2
- 229910004356 Ti Raw Inorganic materials 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Abstract
【解決手段】組成がBa1-xSrxTiyO3(0≦x≦1、0.9≦y≦1.1)からなる誘電体薄膜の製造において、該薄膜の前駆物質を基板に塗布して乾燥した後、該乾燥薄膜を30℃/分以下の昇温速度で本焼成を行うことによって、平均1次粒子径が70nm以上であり、薄膜表面に連続する直線状の長さ1.5μm以上の亀裂が存在せず、電圧5Vにおけるリーク電流密度が10-5A/cm2未満、ないし電圧20Vにおけるリーク電流密度が10-1A/cm2未満である誘電体薄膜を形成する。
【選択図】図1
Description
〔1〕組成がBa1-xSrxTiyO3(0≦x≦1、0.9≦y≦1.1)からなる誘電体薄膜において、薄膜を形成する誘電体結晶粒子の平均1次粒子径が70nm以上であり、薄膜表面に連続する直線状の長さ1.5μm以上の亀裂が存在しないことを特徴とする誘電体薄膜。
〔2〕組成がBa1-xSrxTiyO3 において、0.1≦x≦0.5、0.9≦y≦1.1である上記[1]の誘電体薄膜
〔3〕誘電体結晶粒子の平均1次粒子径が70nm以上〜300nm以下であり、薄膜表面に幅5nm〜60nmであって連続する直線状の長さ1.5μm以上の亀裂が存在しない上記[1]または上記[2]に記載する誘電薄膜。
〔4〕電圧5Vにおけるリーク電流密度が10-5A/cm2未満である絶縁耐電圧を有する上記[1]〜上記[3]の何れかに記載する誘電体薄膜。
〔5〕電圧20Vにおけるリーク電流密度が10-1A/cm2未満である絶縁耐電圧を有する上記[1]〜上記[4]の何れかに記載する誘電体薄膜。
〔6〕誘電体薄膜上にパッシベーション薄膜の積層構造を有する、上記[1]〜上記[5]の何れかに記載する誘電体薄膜。
〔7〕組成がBa1-xSrxTiyO3(0≦x≦1、0.9≦y≦1.1)からなる誘電体薄膜の製造において、該薄膜の前駆物質を基板に塗布して乾燥した後、該乾燥薄膜を30℃/分以下の昇温速度で本焼成を行うことによって、平均1次粒子径が20nm以上であり、薄膜表面に連続する直線状の長さ1.5μm以上の亀裂が存在しない誘電体結晶粒子を形成することを特徴とする誘電体薄膜の成膜方法。
〔8〕組成がBa1-xSrxTiyO3 において、0.1≦x≦0.5、0.9≦y≦1.1である上記[7]に記載する誘電体薄膜の成膜方法。
〔9〕本焼成の温度が450〜800℃である上記[7]または上記[8]に記載する誘電体薄膜の成膜方法。
〔10〕上記[1]〜上記[6]の何れかに記載ずる誘電体薄膜を有する薄膜コンデンサ、キャパシタ、IPD(Integrated Passive Device)、DRAMメモリ用コンデンサ、積層コンデンサ、トランジスタのゲート絶縁体、不揮発性メモリ、焦電型赤外線検出素子、圧電素子、電気光学素子、アクチュエータ、共振子、超音波モータ、またはLCノイズフィルタ素子等の複合電子部品。
〔11〕上記〔10〕に記載する100MHz以上の周波数帯域に対応した、誘電体薄膜を有する薄膜コンデンサ、キャパシタ、IPD(Integrated Passive Device)、DRAMメモリ用コンデンサ、積層コンデンサ、トランジスタのゲート絶縁体、不揮発性メモリ、焦電型赤外線検出素子、圧電素子、電気光学素子、アクチュエータ、共振子、超音波モータ、またはLCノイズフィルタ素子等の複合電子部品。
〔12〕有機バリウム化合物、有機ストロンチウム化合物、およびチタンアルコキシドを、モル比がBa:Sr:Ti=(1−x):x:y(0≦x≦1,0.9≦y≦1.1)となるように有機溶媒中に溶解してなり、上記[1]〜上記[6]の何れかに記載ずる誘電体薄膜の成膜に用いられる前駆物質溶液。
本発明の誘電体薄膜は、組成がBa1-xSrxTiyO3(0≦x≦1、0.9≦y≦1.1)からなる誘電体薄膜において、薄膜を形成する誘電体結晶粒子の平均1次粒子径が70nm以上であり、薄膜表面に連続する直線状の長さ1.5μm以上の亀裂が存在しないことを特徴とする誘電体薄膜である。
誘電体結晶の平均1次粒子径は、その電子顕微鏡写真に写っている、任意の結晶粒子100個に対して、結晶粒子径をノギスを用いて測定し、平均1次粒子径を算出した。
〔亀裂の大きさ〕
誘電体結晶の間の亀裂は、その電子顕微鏡写真に写っている亀裂をノギスを用いて測定した。
FE−SEM(HITACHI S−900、分解能0.7nm)を用いて、加速電圧5kV、50000倍で測定した。
〔リーク電流密度〕
リーク電流密度計(keithley 236 SMU)を用い、バイアスステップ0.5V、ディレータイム0.1秒、温度23℃、湿度50±10%の条件で測定した。
Ba、Sr、Tiのモル比が(70/30/100)になるように調製した前駆体溶液を用いて塗膜を形成し、これを350℃、5分乾燥後、昇温速度5℃/分で700℃、60分焼成した。得られた薄膜のSEM像、リーク特性を図1、2に示す。
Ba、Sr、Tiのモル比が(70/30/100)になるように調製した前駆体溶液を用いて塗膜を形成し、これを350℃、5分乾燥後、昇温速度5℃/分で800℃、60分焼成した。得られた薄膜のSEM像、リーク特性を図3、4に示す。
Ba、Sr、Tiのモル比が(70/30/100)になるように調製した前駆体溶液を用いて塗膜を形成し、これを350℃、5分乾燥後、昇温速度20℃/分で700℃、60分焼成した。得られた薄膜のSEM像、リーク特性を図5、6に示す。
Ba、Sr、Tiのモル比が(70/30/100)になるように調製した前駆体溶液を用いて塗膜を形成し、これを350℃、5分乾燥後、昇温速度600℃/分で700℃、5分焼成した。得られた薄膜のSEM像、リーク特性を図7、8に示す。
Ba、Sr、Tiのモル比が(70/30/100)になるように調製した前駆体溶液を用いて塗膜を形成し、これを350℃、5分乾燥後、昇温速度600℃/分で800℃、5分焼成した。得られた薄膜のSEM像、リーク特性を図9、10に示す。
Claims (12)
- 組成がBa1-xSrxTiyO3(0≦x≦1、0.9≦y≦1.1)からなる誘電体薄膜において、薄膜を形成する誘電体結晶粒子の平均1次粒子径が70nm以上であり、薄膜表面に連続する直線状の長さ1.5μm以上の亀裂が存在しないことを特徴とする誘電体薄膜。
- 組成がBa1-xSrxTiyO3 において、0.1≦x≦0.5、0.9≦y≦1.1である請求項1の誘電体薄膜。
- 誘電体結晶粒子の平均1次粒子径が70nm以上〜300nm以下であり、薄膜表面に幅5nm〜60nmであって連続する直線状の長さ1.5μm以上の亀裂が存在しない請求項1または請求項2に記載する誘電体薄膜。
- 電圧5Vにおけるリーク電流密度が10-5A/cm2未満である絶縁耐電圧を有する請求項1〜請求項3の何れかに記載する誘電体薄膜。
- 電圧20Vにおけるリーク電流密度が10-1A/cm2未満である絶縁耐電圧を有する請求項1〜請求項4の何れかに記載する誘電体薄膜。
- 誘電体薄膜上にパッシベーション薄膜の積層構造を有する、請求項1〜請求項5の何れかに記載する誘電体薄膜。
- 組成がBa1-xSrxTiyO3(0≦x≦1、0.9≦y≦1.1)からなる誘電体薄膜の製造において、該薄膜の前駆物質を基板に塗布して乾燥した後、該乾燥薄膜を30℃/分以下の昇温速度で本焼成を行うことによって、平均1次粒子径が20nm以上であり、薄膜表面に連続する直線状の長さ1.5μm以上の亀裂が存在しない誘電体結晶粒子を形成することを特徴とする誘電体薄膜の成膜方法。
- 組成がBa1-xSrxTiyO3 において、0.1≦x≦0.5、0.9≦y≦1.1である請求項7に記載する誘電体薄膜の成膜方法。
- 本焼成の温度が450〜800℃である請求項7または請求項8に記載する誘電体薄膜の成膜方法。
- 請求項1〜請求項6の何れかに記載する誘電体薄膜を有する薄膜コンデンサ、キャパシタ、IPD(Integrated Passive Device)、DRAMメモリ用コンデンサ、積層コンデンサ、トランジスタのゲート絶縁体、不揮発性メモリ、焦電型赤外線検出素子、圧電素子、電気光学素子、アクチュエータ、共振子、超音波モータ、またはLCノイズフィルタ素子等の複合電子部品。
- 請求項10に記載する100MHz以上の周波数帯域に対応した、誘電体薄膜を有する薄膜コンデンサ、キャパシタ、IPD(Integrated Passive Device)、DRAMメモリ用コンデンサ、積層コンデンサ、トランジスタのゲート絶縁体、不揮発性メモリ、焦電型赤外線検出素子、圧電素子、電気光学素子、アクチュエータ、共振子、超音波モータ、またはLCノイズフィルタ素子等の複合電子部品。
- 有機バリウム化合物、有機ストロンチウム化合物、およびチタンアルコキシドを、モル比がBa:Sr:Ti=(1−x):x:y(0≦x≦1,0.9≦y≦1.1)となるように有機溶媒中に溶解してなり、請求項1〜請求項6の何れかに記載する誘電体薄膜の成膜に用いられる前駆物質溶液。
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JP2012054538A (ja) * | 2010-09-02 | 2012-03-15 | Mitsubishi Materials Corp | 誘電体薄膜形成用組成物、誘電体薄膜の形成方法及び該方法により形成された誘電体薄膜 |
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