Improved High-Efficiency Organic Solar Cells via Incorporation of a Conjugated Polyelectrolyte Interlayer

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• 作者：Jung Hwa Seo ; Andrea Gutacker ; Yanming Sun ; Hongbin Wu ; Fei Huang ; Yong Cao ; Ullrich Scherf ; Alan J. Heeger ; Guillermo C. Bazan
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：June 8, 2011
• 年：2011
• 卷：133
• 期：22
• 页码：8416-8419
• 全文大小：796K
• 年卷期：v.133,no.22(June 8, 2011)
• ISSN：1520-5126

文摘

The power conversion efficiencies of bulk heterojunction (BHJ) solar cells can be increased from 5 to 6.5% by incorporating an ultrathin conjugated polyelectrolyte (CPE) layer between the active layer and the metal cathode. Poly[N-9鈥测€?heptadecanyl-2,7-carbazole-alt-5,5-(4鈥?7鈥?di-2-thienyl-2鈥?1鈥?3鈥?benzothiadiazole)] (PCDTBT) and [6,6]-phenyl C₇₁ butyric acid methyl ester (PC₇₁BM) were chosen for the photoactive layer. CPEs with cationic polythiophenes, in both homopolymer and block copolymer configurations, were used to improve the electronic characteristics. The significant improvement in device performance and the simplicity of fabrication by solution processing suggest a promising and practical pathway for improving polymer solar cells with high efficiencies.