JP7406315B2 - 導電性積層体及びこれを用いた光学装置、導電性積層体の製造方法 - Google Patents
導電性積層体及びこれを用いた光学装置、導電性積層体の製造方法 Download PDFInfo
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- JP7406315B2 JP7406315B2 JP2019124245A JP2019124245A JP7406315B2 JP 7406315 B2 JP7406315 B2 JP 7406315B2 JP 2019124245 A JP2019124245 A JP 2019124245A JP 2019124245 A JP2019124245 A JP 2019124245A JP 7406315 B2 JP7406315 B2 JP 7406315B2
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- transparent material
- material layer
- conductive laminate
- silver
- thickness
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Description
図1は技術が適用された導電性積層体1の構成を模式的に示す断面図である。導電性積層体1は、図1に示すように、透明基板2と、透明基板2の少なくとも1面上に、第1の透明材料層3、銀を主成分とする金属層4、第2の透明材料層5が、透明基板2側からこの順に積層された導電性積層体1であり、第1の透明材料層3が亜鉛を含まない金属酸化物で構成されており、第2の透明材料層5が亜鉛を含む金属酸化物で構成されている。
本発明の透明基板2としては、ガラス基材、樹脂フィルムのいずれからなるものを用いることができる。透明基板2として樹脂フィルムからなるものを用いる場合には、ロールツーロール法によって製造することができるので、生産効率を向上させることができる。
第1の透明材料層3は亜鉛を含まない金属酸化物で構成されており、例えばNb、Ti、Zr、Hf、Ta、W、Mo等、銀との相互作用が小さい物質の酸化物を好適に用いることができる。また、これらは単独もしくは複数の元素を含む複合酸化物であってもよく、亜鉛以外の元素を50原子%以下の濃度で含んでいてもよい。第1の透明材料層3の厚みは特に限定されることはなく、材料構成に応じて最も透過率が高くなる膜厚に設定することができる。第1の透明材料層3の具体的な厚みとしては、例えば30~80nmの範囲とすることができる。
第1の透明材料層3上に積層される金属層4は、銀を主成分とする金属層である。金属層4は、全体で10原子%を超えない範囲で添加元素を加えてもよい。すなわち、本技術に係る金属層4は、90原子%以上の銀又は純銀によって構成される。
金属層4上に積層される第2の透明材料層5は、亜鉛を含む酸化物で構成される。第2の透明材料層5は、光学特性および電気伝導性、化学的安定性の観点から、亜鉛以外の1種類もしくは複数の元素を、50原子%を超えない範囲で添加してもよい。第2の透明材料層5の厚みは特に限定されることはなく、材料構成に応じて最も透過率が高くなる膜厚に設定することができる。第2の透明材料層5の具体的な厚みとしては、例えば30~70nmの範囲とすることができる。
このような導電性積層体1は、透明基板2の少なくとも1面上に、第1の透明材料層3、銀を主成分とする金属層4、第2の透明材料層5を、透明基板2側からこの順に積層する工程により製造することができる。
図2に示す特開2014-34701号公報記載の薄膜形成装置を用い、透明基板上に第1の透明材料層、金属層、第2の透明材料層を順次形成した。透明基板としては厚さ50μmのCOPフィルムを用いた。
酸化ニオブの膜厚を49nm、銀の膜厚を8nm、亜鉛-錫複合酸化物の膜厚を52nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を52nm、銀の膜厚を7nm、亜鉛-錫複合酸化物の膜厚を53nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を43nm、銀の膜厚を10nm、亜鉛-錫複合酸化物の膜厚を49nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を40nm、銀の膜厚を11nm、亜鉛-錫複合酸化物の膜厚を47nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を38nm、銀の膜厚を12nm、亜鉛-錫複合酸化物の膜厚を46nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に酸化チタンを用いて膜厚を39nm、銀の膜厚を10nm、亜鉛-錫複合酸化物の膜厚を52nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に酸化ジルコニウムを用いて膜厚を71nm、銀の膜厚を7nm、亜鉛-錫複合酸化物の膜厚を42nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に酸化ハフニウムを用いて膜厚を62nm、銀の膜厚を7nm、亜鉛-錫複合酸化物の膜厚を47nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に五酸化タンタルを用いて膜厚を58nm、銀の膜厚を7nm、亜鉛-錫複合酸化物の膜厚を50nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に酸化タングステンを用いて膜厚を63nm、銀の膜厚を7nm、亜鉛-錫複合酸化物の膜厚を47nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
<実施例12>
酸化ニオブの膜厚を51nm、銀の膜厚を7nm、第2の透明材料に酸化亜鉛を用いて膜厚を53nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を53nm、銀の膜厚を7nm、第2の透明材料にインジウム-亜鉛複合酸化物を用いて膜厚を51nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を47nm、銀の膜厚を7nm、第2の透明材料にアルミニウム-亜鉛複合酸化物を用いて膜厚を58nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に酸化亜鉛を用いて膜厚を64nm、銀の膜厚を7nm、亜鉛-錫複合酸化物の膜厚を46nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料に亜鉛-錫複合酸化物を用いて膜厚を77nm、銀の膜厚を7nm、第2の透明材料に酸化ニオブを用いて膜厚を35nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を55nm、銀の膜厚を6nm、亜鉛-錫複合酸化物の膜厚を54nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
酸化ニオブの膜厚を55nm、銀の膜厚を7nm、第2の透明材料に酸化ニオブを用いて膜厚を42nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料として酸化亜鉛を用いて膜厚を64nm、銀の膜厚を7nm、第2の透明材料に酸化亜鉛を用いて膜厚を46nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料として酸化亜鉛を用いて膜厚を66nm、銀の膜厚を7nm、第2の透明材料にインジウム-亜鉛複合酸化物を用いて膜厚を44nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料として酸化亜鉛を用いて膜厚を58nm、銀の膜厚を7nm、第2の透明材料にアルミニウム-亜鉛複合酸化物を用いて膜厚を51nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
第1の透明材料として酸化亜鉛を用いて膜厚を74nm、銀の膜厚を8nm、第2の透明材料に酸化チタンを用いて膜厚を31nmとなるように調整した以外は実施例1と同一の条件で試料を作成した。
各試料は任意のサイズに切り出した後、測定・評価を行った。表面抵抗は「JIS K-7194」に準拠して「ロレスタGP(登録商標)(株式会社ダイアインスツルメンツ製)」を用いて測定を行った。
光吸収(%)=100(%)-(透過率(%)+反射率(%)) ・・・・(1)
表1から明らかなように前述の表面抵抗30Ω/□以下、全光線透過率90%以上を保持している。また、光吸収も銀の膜厚増加に伴い微増しているものの全光線透過率に大きな影響を与えるものではなく、本発明で明らかにした光吸収を生じさせる原因の抑制が寄与している。
実施例1~6と比較して、第1の透明材料層を変えた場合の特性を示す。表1から明らかなように前述の表面抵抗30Ω/□以下、全光線透過率90%以上を保持している。すなわち、本発明で示す効果は第1の透明材料層が酸化ニオブに限定されるものではなく、亜鉛を含まない金属酸化物、具体的には酸化チタン、酸化ジルコニウム、酸化ハフニウム、五酸化タンタル、酸化タングステン、酸化モリブデンなどを用いても同様の効果を示すことが分かる。
本発明において実施例1~12までは、単層の膜として比較的低抵抗値を示す錫複合酸化物を第2の透明材料層として使用したが、本発明はそれに限定されるものではない。実施例13~15は、実施例1~6と比較して、第2の透明材料層を変えた場合の特性を示す。表1から明らかなように、実施例13~15においても、前述の表面抵抗30Ω/□以下、全光線透過率90%以上の特性を保持している。すなわち、本発明で示す効果は第2の透明材料層が亜鉛-錫複合酸化物に限定されるものではなく、亜鉛を含む透明導電体であれば同様の効果を示すことが分かる。
比較例1では、第1の透明材料層に酸化亜鉛を用いた。表1に示すように、比較例1に係る試料は、全光線透過率が銀の膜厚が同じ実施例3に比して大きく劣化しており、また光吸収も増大しており第1の透明材料層に亜鉛酸化物を用いると吸収が増大することを示している。
比較例2では、実施例1~6に示す構造とは逆に、第1の透明材料層に亜鉛-錫複合酸化物、第2の透明材料層に酸化ニオブを用いた。表1に示すように、比較例2に係る試料は、銀の膜厚が同じ実施例3と比較しても全光線透過率は低下し、光吸収は増大している。このことは第1の透明材料層と金属層(銀)との界面、金属層(銀)と第2の透明材料層の界面で生じる吸収がそれぞれ別の仕組みで生じていることを示唆している。
比較例3では、実施例1~6と構造は同じくし、金属層(銀)の膜厚を6nmとした。表1に示すように、比較例3に係る試料は、金属層(銀)の膜厚を薄くすると、本発明の効果はもはや得られなくなり、銀薄膜の連続性を維持することができず、膜中で島状の構造になるために、表面抵抗は急激に増大し、また光吸収量も著しく増大した。
比較例4では、第1の透明材料と第2の透明材料をともに酸化ニオブとした。表1に示すように、比較例4に係る試料は、全光線透過率が銀の膜厚が同じである実施例3に比して劣化しており、第2の透明材料に亜鉛を含む材料を用いることで光吸収を抑制できることを示している。また、酸化ニオブも導電性が低いため表面抵抗も上昇してしまった。
比較例5~8では、第1の透明材料層に酸化亜鉛を用いた。表1に示すように、比較例5~8に係る試料は、第2の透明材料層に亜鉛-錫複合酸化物以外を用いても、全光線透過率は改善せず低い値を示しており、第1の透明材料が亜鉛を含む酸化物である場合は第2の透明材料を任意の材料としても高透過の膜を得ることはできないことを示している。
Claims (10)
- 透明基板と、上記透明基板の少なくとも1面上に、Nb、Ti、Zr、Hf、Ta、W、Moの少なくともいずれかの一つの酸化物である第1の透明材料層、上記第1の透明材料層に接し、銀を主成分とする金属層、上記金属層に接する第2の透明材料層が、上記透明基板側からこの順に積層された導電性積層体において、
上記透明基板の厚みが20μm以上200μm以下であり、
上記第1の透明材料層が亜鉛を含まず、
上記金属層は、銀の原子比率が90%以上であり、
上記第2の透明材料層が亜鉛を含む金属酸化物で構成され、
上記第1の透明材料層の厚みが30nm以上80nm以下であり、
上記第2の透明材料層の厚みが30nmより厚く70nm以下であり、
上記第1の透明材料層と上記第2の透明材料層の材料が異なり、
上記金属層の厚みが7nm以上15nm未満であって、
上記導電性積層体全体の上記積層方向における透過率が90%以上であり、
上記第2の透明材料層が設けられた表面を測定面とする表面抵抗が30Ω/□以下である
導電性積層体。 - 上記第2の透明材料層が設けられた最表面の表面抵抗が20Ω/□以下である請求項1に記載の導電性積層体。
- 上記透明基板がガラス、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリアラミド、ポリイミド、ポリカーボネート、ポリエチレン、ポリプロピレン、トリアセチルセルロース(TAC)、ポリシクロオレフィン(COC、又はCOP)のいずれか若しくはその積層体からなることを特徴とする請求項1又は2に記載の導電性積層体。
- 請求項1~3のいずれか1項に記載の導電性積層体を少なくとも1枚用いたことを特徴とする光学装置。
- 請求項1~3のいずれか1項に記載の導電性積層体を電極の少なくとも1方の極として用いることを特徴とするタッチパネル。
- 請求項1~3のいずれか1項に記載の導電性積層体を電極の少なくとも1方の極として用いることを特徴とする調光素子。
- 請求項1~3のいずれか1項に記載の導電性積層体を電極の少なくとも1方の極として用いることを特徴とする電気泳動型光学素子。
- 請求項1~3のいずれか1項に記載の導電性積層体を電極の少なくとも1方の極として用いることを特徴とする発光素子。
- 請求項1~3のいずれか1項に記載の導電性積層体を少なくとも1枚用いたことを特徴とするアンテナ。
- 透明基板の少なくとも1面上に、Nb、Ti、Zr、Hf、Ta、W、Moの少なくともいずれかの一つの酸化物である第1の透明材料層、上記第1の透明材料層に接し、銀を主成分とする金属層、上記金属層に接する第2の透明材料層を、上記透明基板側からこの順に積層する工程を有し、
上記透明基板の厚みが20μm以上200μm以下であり、
上記第1の透明材料層が亜鉛を含まず、
上記金属層は、銀の原子比率が90%以上であり、
上記第2の透明材料層が亜鉛を含む金属酸化物で構成され、
上記第1の透明材料層の厚みが30nm以上80nm以下であり、
上記第2の透明材料層の厚みが30nmより厚く70nm以下であり、
上記第1の透明材料層と上記第2の透明材料層の材料が異なり、
上記金属層の厚みが7nm以上15nm未満であって、
上記導電性積層体全体の上記積層方向における透過率が90%以上であり、
上記第2の透明材料層が設けられた表面を測定面とする表面抵抗が30Ω/□以下である
導電性積層体の製造方法。
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