JPWO2011158892A1 - 色素増感太陽電池用電極及びその製造方法、並びに色素増感太陽電池 - Google Patents
色素増感太陽電池用電極及びその製造方法、並びに色素増感太陽電池 Download PDFInfo
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- JPWO2011158892A1 JPWO2011158892A1 JP2012520485A JP2012520485A JPWO2011158892A1 JP WO2011158892 A1 JPWO2011158892 A1 JP WO2011158892A1 JP 2012520485 A JP2012520485 A JP 2012520485A JP 2012520485 A JP2012520485 A JP 2012520485A JP WO2011158892 A1 JPWO2011158892 A1 JP WO2011158892A1
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- H—ELECTRICITY
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- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
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- H10K30/80—Constructional details
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- H10K30/83—Transparent electrodes, e.g. indium tin oxide [ITO] electrodes comprising arrangements for extracting the current from the cell, e.g. metal finger grid systems to reduce the serial resistance of transparent electrodes
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Abstract
Description
ここで、作用極は、多孔質酸化物半導体層で得られた電気を効率よく外部に引き出すため、透明導電膜上に集電配線を有するのが一般的である。さらに電解質による集電配線の腐食を防止するため、集電配線が配線保護層で被覆されるのが一般的である。
まず作用極20及び対極2を準備する。
作用極20は、以下のようにして得ることができる。
Pyrolysis Deposition)及びCVD法などが用いられる。これらのうちスプレー熱分解法が装置コストの点から好ましい。
一方、対極2は、以下のようにして得ることができる。
次に、作用極20上に封止部を形成する。封止部としては、酸変性ポリオレフィン系熱可塑性樹脂が好ましく用いられる。酸変性ポリオレフィン系熱可塑性樹脂としては、例えば酸変性ポリエチレン系熱可塑性樹脂、酸変性プロピレン系熱可塑性樹脂などが挙げられる。中でも酸変性ポリエチレン系熱可塑性樹脂が好ましい。酸変性ポリエチレン系熱可塑性樹脂は、それ以外の酸変性ポリオレフィン系熱可塑性樹脂を用いる場合に比べて、比較的融点が低い。このため、酸変性ポリオレフィン系熱可塑性樹脂として酸変性ポリエチレン系熱可塑性樹脂を用いると、それ以外の酸変性ポリオレフィン系熱可塑性樹脂を用いる場合に比べて、作用極20又は対極2の表面への熱溶融による接着が容易となる。ここで、ポリエチレン系熱可塑性樹脂とは、エチレンを構成単位に含む熱可塑性樹脂のことを言う。
次に、作用極20の多孔質酸化物半導体層8に光増感色素を担持させる。このためには、作用極20を、光増感色素を含有する溶液の中に浸漬させ、その色素を多孔質酸化物半導体層8に吸着させた後に上記溶液の溶媒成分で余分な色素を洗い流し、乾燥させることで、光増感色素を多孔質酸化物半導体層8に吸着させればよい。但し、光増感色素を含有する溶液を多孔質酸化物半導体層8に塗布した後、乾燥させることによって光増感色素を多孔質酸化物半導体多孔層8に吸着させても、光増感色素を多孔質酸化物半導体層8に担持させることが可能である。
次に、作用極20上であって封止部の内側に電解質3を配置する。電解質3は、作用極20上であって封止部の内側に注入したり、印刷したりすることによって得ることができる。
次に、大気圧下で、作用極20と対極2とを対向させる。そして、大気圧下で、封止部を加圧しながら溶融させることによって封止部と対極2とを接着させる。即ち、作用極20と対極2と封止部とによって電解質3を封止する。こうして、封止部によって作用極20と対極2とを連結させる。
はじめに、10cm×10cm×4mmのFTO基板を準備した。続いて、FTO基板の上に、ドクターブレード法によって酸化チタンペースト(Solaronix社製、Ti nanoixide T/sp)を、その厚さが10μmとなるように塗布した後、150℃で3時間焼成し、FTO基板上に多孔質酸化物半導体層を形成した。
第3熱可塑性配線保護層を形成しなかったこと以外は実施例1と同様にして作用極を作製した。従って、第1熱可塑性配線保護層及び第2熱可塑性配線保護層の熱処理温度及び軟化点は、表1に示す通り、実施例1と同様である。
第1〜第2熱可塑性配線保護層の軟化点、及び、第1〜第2熱可塑性配線保護層の形成時の熱処理温度を表1に示す通りとしたこと以外は実施例2と同様にして作用極を作製した。
第1〜第2熱可塑性配線保護層を構成する材料として、エチレン−ビニル酢酸無水物共重合体(商品名:バイネル、デュポン社製)からなる酸変性ポリオレフィン系熱可塑性樹脂を用い、第1〜第2熱可塑性配線保護層の軟化点、及び、第1〜第2熱可塑性配線保護層の形成時の熱処理温度を表1に示す通りとしたこと以外は実施例2と同様にして作用極を作製した。
第1〜第2熱可塑性配線保護層を構成する材料として、エチレン−メタクリル酸共重合体(商品名:ニュクレル、三井・デュポンポリケミカル社製)からなる酸変性ポリオレフィン系熱可塑性樹脂を用い、第1〜第2熱可塑性配線保護層の軟化点、及び、第1〜第2熱可塑性配線保護層の形成時の熱処理温度を表1に示す通りとしたこと以外は実施例2と同様にして作用極を作製した。
第2熱可塑性配線保護層を形成する際に、第1熱可塑性配線保護層を溶融させるとともに、第3熱可塑性配線保護層を形成する際に、第2熱可塑性配線保護層を溶融させたこと以外は実施例1と同様にして作用極を得た。なお、第2熱可塑性配線保護層及び第3熱可塑性配線保護層の熱処理温度及び軟化点は、表1に示す通りとした。
実施例1〜14及び比較例1の作用極をそれぞれ20ピースずつ用意した。そして、これらの作用極を、アセトニトリルからなる揮発性溶媒を主溶媒とし、ヨウ化リチウムを0.05M、ヨウ化リチウムを0.1M、1,2−ジメチルー3−プロピルイミダゾリウムアイオダイド(DMPII)を0.6M、及び、4−tert−ブチルピリジンを0.5M含む85℃の電解質中に浸して1000時間保持した後、電解質から取り出した。そして、集電配線が腐食している作用極の数を測定し、集電配線が腐食している作用極の割合を算出した。結果を表1に示す。なお、集電配線が腐食したかどうかは、集電配線について光学顕微鏡観察を行い、集電配線が電解質への浸漬前と同様に存在しているかどうかで判断した。
3…電解質
4a,4b,4c…熱可塑性配線保護層
5…集電配線
6…透明基板
7…透明導電膜
8…多孔質酸化物半導体層
12…導電性基板
13…絶縁性樹脂層
20…作用極(電極)
100…色素増感太陽電池
Claims (14)
- 導電性基板上に集電配線を設ける第1工程と、
前記集電配線に、複数の熱可塑性配線保護層を、前記集電配線から遠ざかるにつれて軟化点が低くなるように且つ前記集電配線から2層目以降の前記熱可塑性配線保護層を、直前に形成した前記熱可塑性配線保護層の軟化点未満の熱処理温度で熱処理して順次形成することによって色素増感太陽電池用電極を製造する第2工程とを含む、色素増感太陽電池用電極の製造方法。 - 前記複数の熱可塑性配線保護層が、主成分が同一の材料で構成される熱可塑性配線保護層を少なくとも2層有し、これら熱可塑性配線保護層が互いに隣り合っている、請求項1に記載の色素増感太陽電池用電極の製造方法。
- 前記複数の熱可塑性配線保護層が、主成分がガラス成分で構成される熱可塑性配線保護層を少なくとも2層有し、これら熱可塑性配線保護層が互いに隣り合っている、請求項1に記載の色素増感太陽電池用電極の製造方法。
- 前記第2工程が、前記複数の熱可塑性配線保護層を形成した後、前記複数の熱可塑性配線保護層を絶縁性樹脂層で被覆して前記電極を得る工程を含む、請求項1〜3のいずれか一項に記載の色素増感太陽電池用電極の製造方法。
- 前記集電配線から1層目の前記熱可塑性配線保護層の軟化点が420〜590℃である、請求項1〜4のいずれか一項に記載の色素増感太陽電池用電極の製造方法。
- 隣り合う前記熱可塑性配線保護層同士間の軟化点の差が10〜100℃である、請求項1〜5のいずれか一項に記載の色素増感太陽電池用電極の製造方法。
- 請求項1〜6のいずれか一項に記載の色素増感太陽電池用電極の製造方法によって得られる色素増感太陽電池用電極。
- 導電性基板と、
前記導電性基板上に設けられた集電配線と、
前記集電配線の上に設けられる複数の熱可塑性配線保護層とを備え、
前記複数の熱可塑性配線保護層では、前記熱可塑性配線保護層の軟化点が、前記集電配線から遠ざかるにつれて低くなっている、色素増感太陽電池用電極。 - 前記複数の熱可塑性配線保護層が、主成分が同一の材料で構成される熱可塑性配線保護層を少なくとも2層有し、これら熱可塑性配線保護層が互いに隣り合っている、請求項8に記載の色素増感太陽電池用電極。
- 前記複数の熱可塑性配線保護層が、主成分がガラス成分で構成される熱可塑性配線保護層を少なくとも2層有し、これら熱可塑性配線保護層が互いに隣り合っている、請求項8に記載の色素増感太陽電池用電極。
- 複数の熱可塑性配線保護層を被覆する絶縁性樹脂層を更に備える請求項7〜10のいずれか一項に記載の色素増感太陽電池用電極。
- 前記集電配線から1層目の前記熱可塑性配線保護層の軟化点が420〜590℃である、請求項7〜11のいずれか一項に記載の色素増感太陽電池用電極。
- 隣り合う前記熱可塑性配線保護層同士間の軟化点の差が10〜100℃である、請求項7〜12のいずれか一項に記載の色素増感太陽電池用電極。
- 一対の電極と、
前記一対の電極の間に設けられる電解質とを備え、
前記一対の電極の一方が、請求項7〜13のいずれか一項に記載の色素増感太陽電池用電極である、色素増感太陽電池。
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