JP7237150B2 - 透明導電性フィルム - Google Patents
透明導電性フィルム Download PDFInfo
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- JP7237150B2 JP7237150B2 JP2021517066A JP2021517066A JP7237150B2 JP 7237150 B2 JP7237150 B2 JP 7237150B2 JP 2021517066 A JP2021517066 A JP 2021517066A JP 2021517066 A JP2021517066 A JP 2021517066A JP 7237150 B2 JP7237150 B2 JP 7237150B2
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- transparent conductive
- conductive layer
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Images
Classifications
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
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Description
透明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 ZF16」,厚さ40μm,日本ゼオン社製)の一方の面に、第1硬化性組成物を塗布して第1塗膜を形成した。第1硬化性組成物は、多官能ウレタンアクリレート含有コーティング液(商品名「UNIDIC RS29-120」,DIC社製)100質量部と、架橋アクリル・スチレン樹脂粒子(商品名「SSX105」,粒子径3μm,積水樹脂社製)0.07質量部とを含有する。次に、第1塗膜を乾燥させた後、紫外線照射により、第1塗膜を硬化させてアンチブロッキング(AB)層(厚さ1μm)を形成した。次に、COPフィルムの他方の面に、第2硬化性組成物を塗布して第2塗膜を形成した。第2硬化性組成物は、架橋アクリル・スチレン樹脂粒子(商品名「SSX105」)を含有させなかったこと以外は第1硬化性組成物と同様に調整した組成物である。次に、第2塗膜を乾燥させた後、紫外線照射により、第2塗膜を硬化させてハードコート(HC)層(厚さ1μm)を形成した。以上のようにして、透明基材を作製した。
透明導電層形成工程における次のこと以外は、実施例1の透明導電性フィルムと同様にして、実施例2の透明導電性フィルムを作製した。スパッタ成膜のDC電源出力を25.1kWとした。形成されるITO膜の表面抵抗の値が130Ω/□になるように酸素導入量を調整しつつ、厚さ50nmの非晶質の透明導電層を形成した。
透明導電層形成工程における次のこと以外は、実施例1の透明導電性フィルムと同様にして、実施例3の透明導電性フィルムを作製した。スパッタ成膜のDC電源出力を15.8kWとした。形成されるITO膜の表面抵抗の値が220Ω/□になるように酸素導入量を調整しつつ、厚さ32nmの非晶質の透明導電層を形成した。
透明導電層形成工程における次のこと以外は、実施例1の透明導電性フィルムと同様にして、実施例4の透明導電性フィルムを作製した。透明基材を走行速度5.4m/分で走行させつつ、スパッタ成膜装置が備える第1成膜室での第1スパッタ成膜と、同装置が備える第2成膜室での第2スパッタ成膜とを、順次に実施した。第1スパッタ成膜では、透明基材上に透明導電層の第1領域(厚さ22.5nm)を形成した。第2スパッタ成膜では、第1領域上に透明導電層の第2領域(厚さ2.5nm)を形成した。
透明導電層形成工程における次のこと以外は、実施例1の透明導電性フィルムと同様にして、比較例1の透明導電性フィルムを作製した。透明基材の走行速度を5.4m/分とした。スパッタ成膜時のDC電源出力を20.8kWとした。スパッタリングガスとしてArを用いた。形成されるITO膜の表面抵抗の値が220Ω/□になるように酸素導入量を調整しつつ、厚さ32nmの非晶質の透明導電層を形成した。
透明導電層形成工程における次のこと以外は、実施例4の透明導電性フィルムと同様にして、比較例2の透明導電性フィルムを作製した。第1スパッタ成膜において、DC電源出力を18.5kWとし、スパッタリングガスとしてArを用い、形成されるITO膜の表面抵抗の値が220Ω/□になるように酸素導入量を調整しつつ厚さ28.8nmの第1領域を形成した。第2スパッタ成膜において、DC電源出力を2.3kWとし、スパッタリングガスとしてArを用い、形成されるITO膜の表面抵抗の値が220Ω/□になるように酸素導入量を調整しつつ厚さ3.2nmの第2領域を形成した。
透明導電層形成工程において、形成されるITO膜の表面抵抗の値が140Ω/□になるように酸素導入量を調整しつつ厚さ32nmの非晶質の透明導電層を形成したこと以外は、実施例1の透明導電性フィルムと同様にして、比較例3の透明導電性フィルムを作製した。比較例3の透明導電性フィルムの透明導電層(厚さ32nm)は、Kr含有の非晶質ITOからなる。
実施例1~4および比較例1~3における各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1~4および比較例1~3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1~4および比較例1~3における各透明導電層について、加熱処理後の比抵抗を調べた。加熱処理では、加熱手段として熱風オーブンを使用し、加熱温度を130℃とし、加熱時間を60分間とした。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、比抵抗(Ω・cm)を求めた。加熱処理後の比抵抗の値を表1に示す。表1には、加熱処理前の比抵抗の値も示す。
実施例1~4および比較例3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
実施例1~5および比較例1~3の各透明導電性フィルムについて、透明導電層の結晶化速度を調べた。具体的には、まず、透明導電性フィルムから測定用のサンプル(5cm×5cm)を切り出した。次に、測定装置のステージ上にサンプルをセットした。測定装置は、Accent Optical Technologies社製のホール効果測定器「HL5500PC」のステージを、ヒーター付きのステージ(商品名「JHTM-300HC-001A」,日本サーマルエンジニアリング社製」に取り換えることによって用意した。次に、この装置において、ステージを昇温速度36℃/分で130℃に昇温させた後、130℃到達時点から1分おきに20分まで、サンプルの表面抵抗を測定した(測定は、JIS K 7194(1994年)に準拠した四端子法による)。次に、測定された各抵抗値について、一つ前(1分前)の測定で得られた抵抗値を基準とする抵抗値変化率を求めた。そして、抵抗値変化率が最初に1%以下となった抵抗値にとっての基準抵抗値の測定時間を、結晶化時間とした(例えば、実施例3の透明導電性フィルムのサンプルでは、130℃到達時点から4分後の抵抗値を基準とする5分後の抵抗値の変化率が、1%以下となった最初の抵抗値変化率であったので、結晶化時間は4分である)。その結果を表1に示す。比較例3の測定用サンプルでは、130℃到達時点から20分までの間に抵抗値変化率が1%以下とはならなかった。すなわち、比較例3の透明導電性フィルムにおける透明導電層の結晶化速度は、20分超(>20分)であった。
T 厚さ方向
10 透明基材
11 樹脂フィルム
12 機能層
20,20’ 透明導電層
Claims (3)
- 透明基材と非晶質の透明導電層とを厚さ方向にこの順で備え、
前記透明導電層が、クリプトンを含有し、5.5×10-4Ω・cm以上8×10-4Ω・cm以下の比抵抗を有し、130℃で60分間の加熱処理によって結晶質に転化して2.5×10-4Ω・cm以下の比抵抗を有する、透明導電性フィルム。 - 前記透明導電層がインジウム含有導電性酸化物を含む、請求項1に記載の透明導電性フィルム。
- 前記透明導電層が20nm以上の厚さを有する、請求項1または2のいずれか一つに記載の透明導電性フィルム。
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