JP7451505B2 - 透明導電性フィルムの製造方法 - Google Patents
透明導電性フィルムの製造方法 Download PDFInfo
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- JP7451505B2 JP7451505B2 JP2021517064A JP2021517064A JP7451505B2 JP 7451505 B2 JP7451505 B2 JP 7451505B2 JP 2021517064 A JP2021517064 A JP 2021517064A JP 2021517064 A JP2021517064 A JP 2021517064A JP 7451505 B2 JP7451505 B2 JP 7451505B2
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- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
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Description
透明樹脂フィルムとしての長尺のPETフィルム(厚さ50μm,三菱ケミカル社製)の一方の面に、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当該塗膜を硬化させてハードコート層(厚さ2μm)を形成した。このようにして、透明樹脂フィルムと機能層としてのハードコート層とを備える透明基材を作製した。
第1および第2スパッタ成膜において、各成膜室内の気圧を0.1Paに代えて0.2Pa(実施例2)、0.4Pa(実施例3)、0.6Pa(実施例4)、または0.8Pa(実施例5)としたこと以外は、実施例1の透明導電性フィルムと同様にして、実施例2~5の各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、気圧を0.1Paに代えて0.2Paとし、且つ、形成される第1領域の厚さを95nmに代えて142nmとしたこと、および、第2スパッタ成膜において、気圧を0.1Paに代えて0.2Paとし、且つ、形成される第2領域の厚さを5nmに代えて8nmとしたこと以外は、実施例1の透明導電性フィルムと同様にして、実施例6の透明導電性フィルムを作製した。この透明導電性フィルムの光透過性導電層の総厚さは、150nmである。
第1スパッタ成膜において、気圧を0.1Paに代えて0.2Paとし、且つ、形成される第1領域の厚さを95nmに代えて38nmとしたこと、および、第2スパッタ成膜において、気圧を0.1Paに代えて0.2Paとし、且つ、形成される第2領域の厚さを5nmに代えて2nmとしたこと以外は、実施例1の透明導電性フィルムと同様にして、実施例7の透明導電性フィルムを作製した。この透明導電性フィルムの光透過性導電層の総厚さは、40nmである。
第2スパッタ成膜において、スパッタリングガスとしてKrに代えてArを用いたこと、第2ターゲットに代えて上記の第1ターゲット(酸化スズ濃度10質量%のITO)を用いたこと以外は、実施例2の透明導電性フィルムと同様にして、実施例8の透明導電性フィルムを作製した。
第1および第2スパッタ成膜において、スパッタリングガスとしてKrに代えて、KrとArの混合ガス(混合ガスの体積比は、Kr:Ar=95:5)を用いたこと以外は、実施例2の透明導電性フィルムと同様にして、実施例9の透明導電性フィルムを作製した。
第1および第2スパッタ成膜において、各成膜室内の気圧を0.1Paに代えて1.0Paとしたこと以外は、実施例1の透明導電性フィルムと同様にして、比較例1の透明導電性フィルムを作製した。
第1および第2スパッタ成膜において、スパッタリングガスとしてKrに代えてArを用いたこと以外は、実施例2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、実施例5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、比較例1の透明導電性フィルムと同様にして比較例4の透明導電性フィルムを作製した。
実施例1~9および比較例1~4における各光透過性導電層の厚さを、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1~9および比較例1~4における各光透過性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光透過性導電層の厚さを、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1~9および比較例1~4における各光透過性導電層について、熱風オーブン内での加熱処理の後の比抵抗を調べた。加熱処理において、加熱温度は155℃とし、加熱時間は1時間とした。JIS K 7194(1994年)に準拠した四端子法により、光透過性導電層の表面抵抗(表面抵抗R1)を測定した後、表面抵抗値と光透過性導電層の総厚さとを乗じることにより、比抵抗(比抵抗R2)を求めた。各光透過性導電層の表面抵抗R1(Ω/□)および比抵抗R2(Ω・cm)の値を、表1に掲げる(比較例1における光透過性導電層については、多数のクラックが発生しているために正確な抵抗値を求められなかった)。
実施例1~9および比較例1~4の各透明導電性フィルムについて、加熱処理を経た場合に光透過性導電層にクラックが発生する程度を調べた。具体的には、まず、長辺50cm×短辺5cmのサイズの透明導電性フィルムを3枚用意し、各フィルムの両短辺を、耐熱テープによって鉄板表面に固定した。次に、熱風オーブン内で鉄板上の各透明導電性フィルムを加熱処理した。加熱処理において、加熱温度は140℃とし、加熱時間は1時間とした。次に、加熱処理を経た透明導電性フィルムを5cm×5cmのサイズに細分化し、30枚の観察用のサンプルを得た。次に、サンプルごとに、光学顕微鏡によって観察してクラックの有無を調べた。そして、透明導電性フィルムにおけるクラックの発生の抑制に関し、光透過性導電層にクラックが確認されたサンプルの数が、15枚以下である場合を“○”と評価し、16~25枚である場合を“△”と評価し、26枚以上である場合を“×”と評価した。加熱処理における加熱温度を140℃に代えて155℃または165℃としたこと以外は、以上の操作および評価と同様の操作および評価を実施した。これら評価結果を表1に掲げる。
実施例1~9および比較例1~4における各光透過性導電層がKr原子およびAr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、光透過性導電層に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
D 厚さ方向
10 透明基材
11 透明樹脂フィルム
12 機能層
20 光透過性導電層
21 第1領域
22 第2領域
Claims (6)
- 透明基材を用意する用意工程と、
前記透明基材上に、スパッタリング法により光透過性導電材料を成膜して、比抵抗4.5×10 -4 Ω・cm以上12×10 -4 Ω・cm以下の非晶質の光透過性導電層を形成する成膜工程と、を含み、
前記成膜工程の前記スパッタリング法では、アルゴンより原子番号が大きな希ガスを含むスパッタリングガスと、反応性ガスとを用い、反応性ガス割合が15流量%以下で且つ成膜気圧が0.04Pa以上0.9Pa以下の条件で、前記光透過性導電材料を成膜する、透明導電性フィルムの製造方法。 - 前記希ガスが、クリプトンおよび/またはキセノンである、請求項1に記載の透明導電性フィルムの製造方法。
- 前記スパッタリングガスにおけるクリプトンの含有割合が、50体積%以上である、請求項1または2に記載の透明導電性フィルムの製造方法。
- 前記光透過性導電層が、155℃で1時間の加熱処理の後に2.2×10-4Ω・cm以下の比抵抗を有する、請求項1から3のいずれか一つに記載の透明導電性フィルムの製造方法。
- 前記光透過性導電層を加熱して結晶化させる工程を更に含む、請求項1から4のいずれか一つに記載の透明導電性フィルムの製造方法。
- 前記光透過性導電層をパターニングする工程を更に含む、請求項1から5のいずれか一つに記載の透明導電性フィルムの製造方法。
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