JP7240514B2 - 透明導電性フィルム - Google Patents
透明導電性フィルム Download PDFInfo
- Publication number
- JP7240514B2 JP7240514B2 JP2021545486A JP2021545486A JP7240514B2 JP 7240514 B2 JP7240514 B2 JP 7240514B2 JP 2021545486 A JP2021545486 A JP 2021545486A JP 2021545486 A JP2021545486 A JP 2021545486A JP 7240514 B2 JP7240514 B2 JP 7240514B2
- Authority
- JP
- Japan
- Prior art keywords
- transparent conductive
- conductive layer
- krypton
- layer
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 119
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- 239000010410 layer Substances 0.000 description 335
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Images
Classifications
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Description
図1に示すように、透明導電性フィルム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。透明導電性フィルム1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1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1の機械強度を確保するための透明な基材である。
基材層2は、フィルム形状を有する。基材層2は、透明導電層3の下面に接触するように、透明導電層3の下面全面に、配置されている。
透明樹脂基材21は、フィルム形状を有し、可撓性を有する。
機能層22は、透明樹脂基材21の厚み方向一方面に配置されている。機能層22は、フィルム形状を有する。機能層22として、例えば、ハードコート層、および、光学調整層が挙げられる。
透明導電層3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3は、厚み方向と直交する面方向に延びる。透明導電層3は、平坦な上面および平坦な下面を有する。透明導電層3は、機能層22の上面(厚み方向一方面)に配置されており、機能層22に対して透明樹脂基材21の反対側に位置する。換言すれば、透明導電性フィルム1は、透明樹脂基材21と、機能層22と、透明導電層3とを厚み方向一方側に向かって順に備える。
クリプトン含有透明導電層31は、金属酸化物と、微量のクリプトン原子とを含む。クリプトン含有透明導電層31は、好ましくは、金属酸化物と、微量のクリプトン原子とからなる。具体的には、クリプトン含有透明導電層31では、金属酸化物マトリックス中に、微量のクリプトン原子が存在する。
透明導電層3がクリプトン不含透明導電層32を備える場合、透明導電性フィルム1は、基材層2と、クリプトン含有透明導電層31と、クリプトン不含透明導電層32とを厚み方向一方側に向かって順に備える。具体的には、クリプトン不含透明導電層32は、クリプトン含有透明導電層31の上面(厚み方向一方面)に配置される。
図2A~図2Eに示すように、透明導電性フィルム1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3を配置する第2工程と、透明導電層3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。
図2Aおよび図2Bに示すように、第1工程では、基材層2を準備する。
図2C~図2Dに示すように、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3を配置する。まず、基材層2の厚み方向一方面に、クリプトン含有透明導電層31を配置する。
図2Eに示すように、第3工程では、非晶質の透明導電層3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3を加熱する。
透明導電層3は、クリプトン原子を含み、かつ、透明導電層3(クリプトン含有透明導電層31)のホール移動度が、20.5cm2/V・s以上である。そのため、透明導電層3の比抵抗を低くできながら、透明導電層3の耐酸性の向上を図ることができる。
図4に示すように、透明導電性フィルム1を、物品4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41を得ることもできる。透明導電層フィルム付き物品41は、例えば、物品4と、透明導電性フィルム1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1は、物品に対して貼り合わされ、且つ必要に応じて透明導電層3がパターニングされた状態で、利用される。透明導電性フィルム1は、例えば固着機能層(図示略)を介して、物品4に対して貼り合わされる。透明導電性フィルム付き物品41は、透明導電性フィルム1を備える。そのため、透明導電層3の比抵抗を低くできる。
変形例は、特記する以外、上記した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、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。
上記した実施形態では、透明導電性フィルム1は、基材層2と、クリプトン含有透明導電層31と、クリプトン不含透明導電層32とを厚み方向一方側に向かって順に備える。一方、クリプトン含有透明導電層31と、クリプトン不含透明導電層32との順番は特に限定されない。詳しくは、透明導電性フィルム1は、基材層2と、クリプトン不含透明導電層32と、クリプトン含有透明導電層31とを厚み方向一方側に向かって順に備えることもできる。
<第1工程>
透明樹脂基材としての長尺のシクロオレフィンポリマー(COP)フィルム(商品名「ゼオノア」,厚さ40μm,ゼオン社製)の一方の面に、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組成物)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1μm)を形成した。
次に、反応性スパッタリング法により、透明基材における光学調整層上に、厚さ56nmの非晶質の透明導電層(クリプトン含有透明導電層)を形成した。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。
次に、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。本工程において、加熱温度は130℃とし、加熱時間は1.5時間とした。
以下のこと以外は、実施例1の透明導電性フィルムと同様にして、実施例2、3および比較例1の各透明導電性フィルムを作製した。
以下のこと以外は、実施例1の透明導電性フィルムと同様にして、比較例2~4の各透明導電性フィルムを作製した。
実施例1~3および比較例1~5の各透明導電性フィルムにおける透明導電層の厚さを、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、実施例1~3および比較例1~5における各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。
実施例1~3および比較例1~5の各透明導電性フィルムについて、透明導電層のホール移動度を測定した。本測定には、ホール効果測定システム(商品名「HL5500PC」,バイオラッド社製)を使用した。本測定により得られたホール移動度(cm2/V・s)の値を表1に示す。
実施例1~3および比較例1~5の各透明導電性フィルムについて、加熱処理後の透明導電層の比抵抗を調べた。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、透明導電層の比抵抗(Ω・cm)を求めた。その結果を表1に示す。
実施例1~3および比較例1~5の各透明導電性フィルムについて、透明導電層のエッチングレート[sec/nm]を調べた。具体的には、透明導電性フィルムについて、次のような第1ステップ、第2ステップ、および第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(第3ステップにおいて、後記の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)。
実施例1~3および比較例1における各透明導電層がクリプトン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。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
21 透明樹脂基材
3 透明導電層
Claims (2)
- 透明樹脂基材と透明導電層とを厚さ方向一方側に向かって順に備え、
前記透明導電層が、インジウムスズ複合酸化物を含み、
前記透明導電層が、クリプトンを含有し且つ結晶質であり、
前記透明導電層のホール移動度が、20.5cm2/V・s以上であり、
前記透明導電層の比抵抗が、2.2×10-4Ω・cm未満である、透明導電性フィルム。 - 前記透明導電層が、パターン形状を有する、請求項1に記載の透明導電性フィルム。
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