Photocurrents Generated under Forward Biases in Organic Thin-Film Solar Cells with Organic Heterojunction Structure
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概要
- 論文の詳細を見る
The mechanism of photocurrent generation for organic solar cells with a heterojunction formed between metal phthalocyanine and C60 (or a perylene derivative) was studied. Photocurrent was observed under both reverse and forward biases. Under reverse biases, photocurrent action spectra showed that excitons generated in both organic layers contribute to photocurrent, whereas under forward biases, the excitons generated in only one of them contributed to photocurrent. Forward photocurrent was attributed to the electron transfer reaction between excitons and charge carriers accumulated at the organic/organic junction, the charge carriers depending on the rate of carrier injection from the electrodes. Forward photocurrent showed quantum efficiencies higher than 100% under very weak irradiation, and was attributed to current multiplication at the organic/electrode interface. Since this phenomenon is closely associated with the interfacial structure, it can be used as a measure of interface quality.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-04-30
著者
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Yamamoto Shuhei
Research Center For Solar Energy Chemistry Osaka University
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Osasa Takahiro
Research Center For Solar Energy Chemistry Osaka University
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Matsumura Michio
Research Center For Photoenergetics Of Organic Materials Osaka University
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Yamamoto Shuhei
Research Center for Solar Energy Chemistry, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
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