JP4760154B2 - 酸化物焼結体、酸化物透明導電膜、およびこれらの製造方法 - Google Patents
酸化物焼結体、酸化物透明導電膜、およびこれらの製造方法 Download PDFInfo
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- JP4760154B2 JP4760154B2 JP2005175794A JP2005175794A JP4760154B2 JP 4760154 B2 JP4760154 B2 JP 4760154B2 JP 2005175794 A JP2005175794 A JP 2005175794A JP 2005175794 A JP2005175794 A JP 2005175794A JP 4760154 B2 JP4760154 B2 JP 4760154B2
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- sintered body
- oxide
- oxide sintered
- indium
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- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 53
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- 229910001887 tin oxide Inorganic materials 0.000 description 1
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Description
本発明に係るIn−W−O系酸化物焼結体は、タングステンがW/In原子数比で0.001以上0.034以下の割合で含まれ、密度が4.0g/cm3以上6.5g/cm3以下である。
In−W−O系の酸化物透明導電膜は、前述のように太陽電池や表示デバイスの透明電極用として有用であるが、その理由は、以下の通りである。
平均粒径が1μm以下のIn2O3粉末、および平均粒径が1μm以下のWO3粉末を原料粉末とし、In2O3粉末とWO3粉末を、W/Inの原子数比が0.006となるような割合で調合した。これらの原料を乾式ボールミル、Vブレンダーなどで均一に混合し、カーボン製容器中に給粉して各条件でホットプレス法を用いて焼結した。焼結温度は700〜900℃、圧力は2.45MPa(25kgf/cm2)〜29.40MPa(300kgf/cm2)の範囲から選択し、焼結時間は1時間で一定とした。雰囲気は不活性ガス(Arガス)中で行った。
焼結温度を700℃、焼結時間を0.5時間、焼結圧力を4.91MPaとした以外は、実施例1〜6と同じ条件でホットプレス焼結法で酸化物焼結体タブレットを作製したところ、密度は3.8g/cm3であった。測定結果を表1に示す。
焼結温度を900℃、焼結時間を3時間、焼結圧力を29.40MPaとした以外は、実施例1〜6と同じ条件でホットプレス焼結法で酸化物焼結体タブレットを作製したところ、密度は6.7g/cm3であった。測定結果を表1に示す。
焼結温度を1000℃、焼結時間を1時間、焼結圧力を14.70MPaとした以外は、実施例1〜6と同じ条件でホットプレス焼結法で酸化物焼結体タブレットを作製したところ、密度は6.6g/cm3であった。測定結果を表1に示す。
平均粒径が1μm以下のIn2O3粉末、および平均粒径が1μm以下のWO3粉末、さらに平均粒径が1μm以下のZnO粉末を原料粉末とし、In2O3粉末とWO3粉末を、W/Inの原子数比が0.006、Zn/Inの原子数比が0.00018〜0.017となるような割合で調合し、樹脂製ポットに入れ、湿式ボールミルで混合した。この際、硬質ZrO2ボールを用い、混合時間を18時間とした。混合後、スラリーを取り出し、濾過、乾燥、造粒した。
原料粉末の調合におけるZnO粉末の量をZn/Inの原子数比で0.00015とした以外は、実施例7〜11と同じ条件で常圧焼結法による酸化物焼結体タブレットを作製したところ、密度は3.7g/cm3であった。測定結果を表2に示す。
平均粒径が1μm以下のIn2O3粉末、および平均粒径が1μm以下のWO3粉末を原料粉末とし、In2O3粉末とWO3粉末を、W/Inの原子数比が0.006となるような割合で調合し、樹脂製ポットに入れ、湿式ボールミルで混合した。この際、硬質ZrO2ボールを用い、混合時間を18時間とした。混合後、スラリーを取り出し、濾過、乾燥、造粒した。
焼結温度を1150〜1250℃とし、焼結時間を1〜5時間とした以外は、比較例5と同じ条件で常圧焼結法で酸化物焼結体タブレットを作製したところ、密度は3.4〜3.8g/cm3であった。測定結果を表2に示す。
焼結温度を1300℃とし、焼結時間を5時間とした以外は、比較例5と同じ条件で常圧焼結法で酸化物焼結体タブレットの作製をしたところ、密度は4.1g/cm3であった。測定結果を表2に示す。
平均粒径が1μm以下のIn2O3粉末、および平均粒径が1μm以下のWO3粉末、さらに平均粒径が1μm以下のZnO粉末を原料粉末とし、In2O3粉末とWO3粉末を、W/Inの原子数比が0.012、Zn/Inの原子数比が0.008となるような割合で調合し、樹脂製ポットに入れ、湿式ボールミルで混合した。この際、硬質ZrO2ボールを用い、混合時間を18時間とした。混合後、スラリーを取り出し、濾過、乾燥、造粒した。
焼結時間を0.5時間とした以外は、実施例13と同じ条件で酸化物焼結体タブレットを作製したところ、密度は3.8g/cm3であった。測定結果を表2に示す。
焼結温度を1200℃とし、焼結時間を4時間とした以外は、実施例18と同じ条件で酸化物焼結体タブレットを作製したところ、密度は6.8g/cm3であった。測定結果を表2に示す。
焼結中に焼結炉内に酸素を導入しないこととした以外は、実施例17と同じ条件で常圧焼結法で酸化物焼結体タブレットを作製したところ、密度は6.2g/cm3であった。測定結果を表2に示す。
酸化物焼結体タブレットの組成(W/In原子数比、Zn/In原子数比)を(0.001、0)、(0.025、0)、(0.034、0)として、実施例1〜6と同様に、ホットプレス焼結法で焼結条件を変えて種々の密度の蒸着用焼結体タブレットを作製し、同様に電子ビーム照射による耐久性を調べた。
平均粒径が約10μmのIn2O3粉末を用いた以外は実施例3と同様の条件で酸化物焼結体タブレットを作製したところ、密度は4.5g/cm3であった。また、酸化物焼結体の電子ビーム照射面に対し、四端針法抵抗率計ロレスタEP(ダイアインスツルメンツ社製、MCP−T360型)で電子ビーム照射面である円形面の表面抵抗を測定して比抵抗を算出したところ、0.9kΩcm以下であった。
酸化物焼結体タブレットの組成(W/In原子数比、Zn/In原子数比)を(0.018、0.008)とし、焼結体作製時において、常圧焼結後の冷却の際に焼結炉内に導入していた酸素を止めずに5L/minの割合で酸素導入したまま降温した以外は、実施例14と同様の条件で酸化物焼結体タブレットを作製したところ、密度は4.7g/cm3であった。
実施例1〜19、比較例1〜11の酸化物焼結体タブレットを用いて、プラズマガンを用いた高密度プラズマアシスト蒸着法(HDPE法)による成膜を行い、酸化物焼結体タブレットとしての耐久性を調べた。その結果、実施例1〜19、比較例1〜11で得られた結果と同様の傾向を示しており、密度が4.0〜6.5g/cm3の酸化物焼結体タブレットを使用することで、割れやクラックの発生しない蒸着用タブレットが得られることがわかった。
Claims (5)
- タングステンを固溶したインジウム酸化物を含有し、タングステンがインジウムに対する原子数比で0.001以上0.034以下含まれる真空蒸着用酸化物焼結体の製造方法において、タングステンのインジウムに対する原子数比が0.001以上0.034以下となるように酸化インジウム粉末と酸化タングステン粉末を調合し、混合する工程1と、工程1で得られた混合物を、温度:700℃以上900℃以下、時間:1h以上3h未満、雰囲気:不活性ガス中あるいは真空中、圧力:2.45MPa以上29.40MPa以下で、ホットプレスして、密度が4.0g/cm3以上6.5g/cm3以下で、結晶粒径の平均値が10μm以下であり、かつ、金属相を含まない、酸化物焼結体を得る工程2と、を有することを特徴とする真空蒸着用酸化物焼結体の製造方法。
- タングステン、亜鉛を固溶したインジウム酸化物を含有し、タングステンがインジウムに対する原子数比で0.001以上0.034以下含まれ、亜鉛がインジウムに対する原子数比で0.00018以上0.017以下含まれる真空蒸着用酸化物焼結体の製造方法において、タングステンのインジウムに対する原子数比が0.001以上0.034以下、亜鉛のインジウムに対する原子数比が0.00018以上0.017以下となるように酸化インジウム粉末と酸化タングステン粉末と酸化亜鉛粉末とを調合し、混合する工程1と、工程1で得られた混合物を、温度:700℃以上900℃以下、時間:1h以上3h未満、雰囲気:不活性ガス中あるいは真空中、圧力:2.45MPa以上29.40MPa以下で、ホットプレスして、密度が4.0g/cm3以上6.5g/cm3以下で、結晶粒径の平均値が10μm以下であり、かつ、金属相を含まない、酸化物焼結体を得る工程2と、を有することを特徴とする真空蒸着用酸化物焼結体の製造方法。
- タングステン、亜鉛を固溶したインジウム酸化物を含有し、タングステンがインジウムに対する原子数比で0.001以上0.034以下含まれ、亜鉛がインジウムに対する原子数比で0.00018以上0.017以下含まれる真空蒸着用酸化物焼結体の製造方法において、タングステンのインジウムに対する原子数比が0.001以上0.034以下、亜鉛のインジウムに対する原子数比が0.00018以上0.017以下となるように酸化インジウム粉末と酸化タングステン粉末と酸化亜鉛粉末とを調合し、混合する工程1と、工程1で得られた混合物を、圧力:9.8MPa以上294MPa以下の冷間静水圧プレスで成形して成形体を得る工程2と、工程2で得られた成形体を、常圧で、焼結炉内の大気に炉内容積0.1m3当たり3〜8L/minの割合で酸素を導入した雰囲気で、温度:1000℃以上1200℃以下、時間:1h以上5h以下で、焼結させ、焼結後の炉冷を行うに際して、酸素の導入を中止することにより、密度が4.0g/cm3以上6.5g/cm3以下で、結晶粒径の平均値が10μm以下であり、かつ、金属相を含まない、酸化物焼結体を得る工程3と、を有することを特徴とする真空蒸着用酸化物焼結体の製造方法。
- 請求項1〜3のいずれか一項に記載の製造方法により得られ、かつ、比抵抗が1kΩcm以下であることを特徴とする真空蒸着用酸化物焼結体。
- 請求項4に記載の真空蒸着用酸化物焼結体からなるタブレットを用いて、130℃以下の基板上に真空蒸着法によって非晶質の酸化物透明導電膜を作製した後、作製した膜を不活性ガス中または真空中で200〜400℃で熱処理することにより、結晶性の酸化物透明導電膜を得ることを特徴とする酸化物透明導電膜の製造方法。
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EP1033355A4 (en) * | 1998-08-31 | 2010-12-01 | Idemitsu Kosan Co | TARGET FOR TRANSPARENT ELECTRICALLY CONDUCTIVE LAYER, TRANSPARENT ELECTRICALLY CONDUCTIVE MATERIAL, TRANSPARENT ELECTRICALLY CONDUCTIVE GLASS AND TRANSPARENT ELECTRICALLY CONDUCTIVE LAYER |
JP3780932B2 (ja) * | 2000-12-28 | 2006-05-31 | 住友金属鉱山株式会社 | 透明導電性薄膜作製用焼結体ターゲットおよびその製造方法 |
JP3797317B2 (ja) * | 2002-05-30 | 2006-07-19 | 住友金属鉱山株式会社 | 透明導電性薄膜用ターゲット、透明導電性薄膜およびその製造方法、ディスプレイ用電極材料、有機エレクトロルミネッセンス素子 |
JP4240928B2 (ja) * | 2002-07-09 | 2009-03-18 | 住友金属鉱山株式会社 | 酸化物透明導電膜及びその製法 |
JP4168689B2 (ja) * | 2002-07-19 | 2008-10-22 | 住友金属鉱山株式会社 | 薄膜積層体 |
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KR100819621B1 (ko) | 2008-04-04 |
EP1734150A1 (en) | 2006-12-20 |
KR20060131657A (ko) | 2006-12-20 |
ES2362615T3 (es) | 2011-07-08 |
TW200708482A (en) | 2007-03-01 |
JP2006347807A (ja) | 2006-12-28 |
DE602006020522D1 (de) | 2011-04-21 |
EP1734150B1 (en) | 2011-03-09 |
TWI323724B (en) | 2010-04-21 |
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