JP7073589B2 - 透明導電層および透明導電性フィルム - Google Patents
透明導電層および透明導電性フィルム Download PDFInfo
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- JP7073589B2 JP7073589B2 JP2021545488A JP2021545488A JP7073589B2 JP 7073589 B2 JP7073589 B2 JP 7073589B2 JP 2021545488 A JP2021545488 A JP 2021545488A JP 2021545488 A JP2021545488 A JP 2021545488A JP 7073589 B2 JP7073589 B2 JP 7073589B2
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- transparent conductive
- conductive layer
- krypton
- layer
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Description
また、透明導電膜の比抵抗を、より一層低くすることも要求される。
透明導電層1は、所定の厚みを有するフィルム形状(シート形状を含む)を有する。透明導電層1は、厚み方向と直交する面方向に延びる。透明導電層1は、平坦な上面および平坦な下面を有する。
透明導電層1は、図1に示すように、クリプトン含有透明導電層10と、クリプトン不含透明導電層11とを順に備える。より具体的には、透明導電層1は、クリプトン含有透明導電層10と、クリプトン含有透明導電層10の上面(厚み方向一方面)に配置されるクリプトン不含透明導電層11とを備える。好ましくは、透明導電層1は、クリプトン含有透明導電層10と、クリプトン不含透明導電層11とのみを備える。
透明導電性フィルム20は、図2に示すように、所定の厚みを有するフィルム形状(シート形状を含む)を有する。透明導電性フィルム20は、厚み方向と直交する面方向に延びる。透明導電性フィルム20は、平坦な上面および平坦な下面を有する。
基材層2は、透明導電性フィルム20の機械強度を確保するための透明な基材である。
透明基材3は、フィルム形状を有する。
機能層4は、透明基材3の厚み方向一方面に配置されている。
また、樹脂は、例えば、特開2008-88309号公報に記載の反応性希釈剤を含むことができる。具体的には、樹脂は、多官能(メタ)アクリレートを含むことができる。
透明導電層1および透明導電性フィルム20の製造方法は、基材層2を準備する第1工程と、基材層2の厚み方向一方面に、透明導電層1を配置する第2工程と、透明導電層1を加熱する第3工程とを備える。また、この製造方法では、各層を、例えば、ロールトゥロール方式で、順に配置する。
第1工程では、基材層2を準備する。
第2工程では、基材層2(ハードコート層)の厚み方向一方面に、透明導電層1を配置する。
第3工程では、非晶質の透明導電層1を加熱する。例えば、加熱装置(例えば、赤外線ヒーター、および、熱風オーブン)によって、非晶質の透明導電層1を加熱する。
<透明導電層>
透明導電層1は、図5に示すように、クリプトン含有透明導電層10からなる。
透明導電性フィルム20は、図6に示すように、基材層2と、透明導電層1(クリプトン含有透明導電層10)とを厚み方向一方側に向かって順に備える。より具体的には、透明導電性フィルム20は、基材層2と、基材層2の上面(厚み方向一方面)に配置される透明導電層1(クリプトン含有透明導電層10)とを備える。好ましくは、透明導電性フィルム20は、基材層2と、透明導電層1(クリプトン含有透明導電層10)とのみを備える。
透明導電層1および透明導電性フィルム20の製造方法は、基材層2を準備する第1工程と、基材層2の厚み方向一方面に、透明導電層1を配置する第2工程と、透明導電層1を加熱する第3工程とを備える。
第1工程では、図7Aに示すように、上記した第1実施形態と同様の方法で、基材層2を準備する。
第2工程では、基材層2(ハードコート層)の厚み方向一方面に、透明導電層1を配置する。
第3工程では、図7Cに示すように、上記した第1実施形態と同様の方法で、非晶質の透明導電層1を加熱する。これにより、非晶質の透明導電層1が結晶化され、結晶質の透明導電層1が形成される。
透明導電層1は、クリプトン原子を含み、かつ、X線回折のピークの半値幅が、(222)面において、0.31°以下である。これにより、透明導電層1の結晶粒子径を大きくできる。そうすると、耐酸性に優れ、かつ、比抵抗を低くできる。
透明導電性フィルム20を、部品31の厚み方向一方面に配置して、透明導電層フィルム付き物品30を得ることもできる。
変形例において、第1実施形態および第2実施形態と同様の部材および工程については、同一の参照符号を付し、その詳細な説明を省略する。また、変形例は、特記する以外、第1実施形態および第2実施形態と同様の作用効果を奏することができる。さらに、第1実施形態、第2実施形態およびその変形例を適宜組み合わせることができる。
実施例1
<第1工程>
透明基材としての長尺のPETフィルム(厚さ50μm、東レ社製)の厚み方向一方面に、ハードコート組成物(アクリル樹脂を含有する紫外線硬化性樹脂)を塗布して塗膜を形成した。次に、紫外線照射によって、塗膜を硬化させた。これにより、ハードコート層(厚さ2μm)を形成した。これにより、基材層を準備した。
次に、反応性スパッタリング法により、基材層(ハードコート層)の厚み方向一方面に、厚さ130nmの非晶質の透明導電層(クリプトン含有透明導電層)を配置した。反応性スパッタリング法では、ロールトゥロール方式で成膜プロセスを実施できるスパッタ成膜装置(DCマグネトロンスパッタリング装置)を使用した。
非晶質の透明導電層を、熱風オーブン内での加熱によって結晶化させた。加熱温度は165℃とし、加熱時間は1時間とした。
実施例1と同様にして、透明導電層とともに、透明導電性フィルムを得た。
<第2工程>
第2工程では、第4工程および第5工程の順に実施した。
第4工程では、実施例1の第2工程と同様にして、基材層の厚み方向一方面に、クリプトン含有透明導電層を配置した。
但し、酸素導入量は、非晶質のクリプトン含有透明導電層の比抵抗の値が6.5×10-4Ω・cmになるように調整した(クリプトンおよび酸素の合計導入量に対する酸素導入量の割合は約2.6流量%)。また、非晶質のクリプトン含有透明導電層の厚みを、表1に従って、変更した。
第5工程では、上記第2工程と同様にして、クリプトン含有透明導電層の厚み方向一方面に、クリプトン不含透明導電層(アルゴン含有透明導電層)を配置した。
実施例2と同様にして、透明導電層とともに、透明導電性フィルムを得た。
実施例2と同様にして、透明導電層とともに、透明導電性フィルムを得た。
但し、第2工程では、第5工程および第4工程の順に実施した。また、非晶質のクリプトン含有透明導電層、および、非晶質のアルゴン含有透明導電層の厚みを、表1に従って、変更した。
実施例1と同様にして、透明導電層とともに、透明導電性フィルムを得た。
但し、スパッタリングガスとして、クリプトンおよびアルゴンの混合ガス(クリプトン90体積%、アルゴン10体積%)を用い、酸素導入量は、非晶質のクリプトン含有透明導電層の比抵抗の値が5.8×10-4Ω・cmになるように調整した。また、非晶質のクリプトン含有透明導電層の厚みを、表1に従って、変更した。
実施例1と同様にして、透明導電層とともに、透明導電性フィルムを得た。
<透明導電層の厚み>
各実施例および各比較例の透明導電層の厚みを、FE-TEM観察により測定した。具体的には、まず、FIBマイクロサンプリング法により、各実施例および各比較例の透明導電層の断面観察用サンプルを作製した。FIBマイクロサンプリング法では、FIB装置(商品名「FB2200」、Hitachi製)を使用し、加速電圧を10kVとした。次に、断面観察用サンプルにおける透明導電層の厚さを、FE-TEM観察によって測定した。FE-TEM観察では、FE-TEM装置(商品名「JEM-2800」、JEOL製)を使用し、加速電圧を200kVとした。
また、実施例2および実施例3において、クリプトン含有透明導電層の厚みは、クリプトン含有透明導電層の厚み方向一方面に、アルゴン含有透明導電層を配置する前に、クリプトン含有透明導電層から、断面観察用サンプルを作製し、そのサンプルをFE-TEM観察にすることにより測定した。また、アルゴン含有透明導電層の厚みは、透明導電層の厚みから、クリプトン含有透明導電層の厚みを差し引くことにより算出した。
各実施例および各比較例の透明導電層のX線回折ピークは、水平型X線回折装置(商品名「SmartLab」、株式会社リガク製)を用いて、下記測定条件に基づいて、X線回折測定することにより取得した。また、X線ピークプロファイルは、各実施例および各比較例のPETフィルム(各実施例および各比較例の透明導電層と同条件で加熱済みのPETフィルム)由来のバックグラウンドを差し引いた値とした。その後、解析ソフトウェア(ソフト名「SmartLab StudioII」)を用いて、2θが29.5°~31.5°の範囲となるように(222)面に対応するX線回折ピークのプロファイルを作成し、X線回折ピークのフィッティング(ピーク形状;分割型PearsonVII関数、バックグラウンドタイプ;B-スプライン、フィッティング条件;自動)をすることで、222)面におけるX線回折のピークの半値幅(FWHM、単位;°)、および、結晶粒子径(結晶子サイズ、単位:Å)を求めた。その結果を表1に示す。
平行ビーム光学配置
光源:CuKα線(波長:1.54059Å)
出力:45kV、200mA
入射側スリット系:ソーラスリット5.0°
入射スリット:1.000mm
受光スリット:20.100mm
受光側スリット:パラレルスリットアナライザー(PSA)0.114deg.
検出器:多次元ピクセル検出器 Hypix-3000
試料ステージ:透明導電性フィルムの透明基材に、粘着層を介してガラスを貼り合せた検体を、試料板(4インチウェーハ試料板)に静置した。
スキャン軸:2θ/θ(Out of Plane測定)
ステップ間隔:0.02°
測定スピード:0.8°/分
測定範囲:10°~90°
各実施例および各比較例の透明導電層について、比抵抗を測定した。具体的には、JIS K 7194(1994年)に準拠した四端子法により、透明導電層の表面抵抗を測定した。その後、表面抵抗値と透明導電層の厚さとを乗じることにより、比抵抗(Ω・cm)を求めた。その結果を表1に示す。
各実施例および各比較例における透明導電性フィルムの透明導電層について、耐酸性を評価した。具体的には、透明導電性フィルムについて、下記第1ステップ、下記第2ステップ、および、下記第3ステップがこの順で実施される1サイクルを繰り返した。評価は、第3ステップにおいて、後述する基準に基づきエッチングが完了したと判定されるまで、1サイクルを繰り返した。
第2ステップ:透明導電性フィルムを、水洗し、その後に乾燥した。
第3ステップ:透明導電性フィルムの透明導電層の露出面において、表面抵抗測定テスタを使用して、離隔距離15mmの一対の端子の間の抵抗(端子間抵抗)を測定した。
各実施例における各透明導電層がKr原子を含有することは、次のようにして確認した。まず、走査型蛍光X線分析装置(商品名「ZSX PrimusIV」、リガク社製)を使用して、下記の測定条件にて蛍光X線分析測定を5回繰り返し、各走査角度の平均値を算出し、X線スペクトルを作成した。そして、作成されたX線スペクトルにおいて、走査角度28.2°近傍にピークが出ていることを確認することにより、透明導電層にKr原子が含有されることを確認した。
スペクトル;Kr-KA
測定径:30mm
雰囲気:真空
ターゲット:Rh
管電圧:50kV
管電流:60mA
1次フィルタ:Ni40
走査角度(deg):27.0~29.5
ステップ(deg):0.020
速度(deg/分):0.75
アッテネータ:1/1
スリット:S2
分光結晶:LiF(200)
検出器:SC
PHA:100~300
2 基材層
20 透明導電性フィルム
Claims (5)
- クリプトン原子を含み、
(222)面における結晶粒子径が、364Å以上である結晶子を含み、
X線回折のピークの半値幅が、(222)面において、0.31°以下である、透明導電層。 - インジウムスズ複合酸化物を含む、請求項1に記載の透明導電層。
- 比抵抗が、2.3×10-4Ω・cm未満である、請求項1または2に記載の透明導電層。
- パターン形状を有する、請求項1~3のいずれか一項に記載の透明導電層。
- 基材層と、請求項1~4のいずれか一項に記載の透明導電層とを厚み方向一方側に向かって順に備える、透明導電性フィルム。
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JP7264807B2 (ja) * | 2017-12-28 | 2023-04-25 | 日東電工株式会社 | 光透過性導電フィルム、その製造方法、調光フィルム、および、調光部材 |
CN108486550B (zh) * | 2018-04-27 | 2020-06-16 | 华南理工大学 | 一种金属氧化物透明导电薄膜的制备方法及其产品和用途 |
JP7054651B2 (ja) * | 2018-06-19 | 2022-04-14 | 日東電工株式会社 | 下地層付きフィルム、透明導電性フィルム、透明導電性フィルム積層体および画像表示装置 |
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