9-Alkylidene-9H-Fluorene-Containing Polymer for High-Efficiency Polymer Solar Cells

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• 作者：Chun Du ; Cuihong Li ; Weiwei Li ; Xiong Chen ; Zhishan Bo ; Clemens Veit ; Zaifei Ma ; Uli Wuerfel ; Hongfei Zhu ; Wenping Hu ; Fengling Zhang
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：October 11, 2011
• 年：2011
• 卷：44
• 期：19
• 页码：7617-7624
• 全文大小：1020K
• 年卷期：v.44,no.19(October 11, 2011)
• ISSN：1520-5835

文摘

A novel donor鈥揳cceptor copolymer containing 9-alkylidene-9H-fluorene unit in the main chain, poly[9-(1鈥?hexylheptylidene)-2,7-fluorene-alt-5,5-(4鈥?7鈥?di-2-thienyl-5鈥?6鈥?dialkoxy-2鈥?1鈥?3鈥?benzothiadiazole)] (PAFDTBT), has been synthesized and evaluated in bulk heterojunction polymer solar cells (BHJ PSCs). The polymer possesses a low band gap of 1.84 eV, a low-lying HOMO energy level (5.32 eV), and excellent solubility in common organic solvents. PSCs based on PAFDTBT and (6,6)-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM) demonstrate a power conversion efficiency (PCE) of 6.2% with a high fill factor (FF) of 0.70, which indicates that 9-alkylidene-9H-fluorene can be a very useful building block for constructing narrow band gap conjugated polymers for high-efficiency BHJ PSCs.