Improved Carrier Dynamics and High Solar Cell Performance in Postadditive-Soaked PTB7:PC71BM Bulk Heterojunction Materials

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• 作者：In-Wook Hwang ; Jaemin Kong ; Hyung Keun Yoo ; Kwanghee Lee
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：June 11, 2015
• 年：2015
• 卷：119
• 期：23
• 页码：12896-12903
• 全文大小：546K
• ISSN：1932-7455

文摘

Improved performance of polymer-based solar cells based on PTB7:PC₇₁BM composites has been obtained by using additive-soaking treatments on pristine bulk-heterojunction (BHJ) films. From analyses of the nanoscale morphologies, solar-cell-device performance, and photoluminescence (PL) characteristics, we found that the best performance predominantly resulted from improved exciton dissociation and enhanced electron transport after photoexcitation of the PC₇₁BM phases. Our analyses showed that thinner PC₇₁BM networks with high electron mobilities, which are ideal for polymer-based solar cells, could be fabricated by using postadditive-soaking treatments. Improved film morphologies and carrier dynamics of the additive-soaked BHJ films also led to increased device lifetimes.