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Haijun Fan, Zhiguo Zhang, Yongfang Li and Xiaowei Zhan Copolymers of fluorene and thiophene with conjugated side chain for polymer solar cells: Effect of pendant acceptors Journal of Polymer Science Part A: Polymer Chemistry 49

Version of Record online: 24 JAN 2011 | DOI: 10.1002/pola.24568

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Two new conjugated fluorene–thiophene copolymers with pendant acceptor cyanoacetate (P2) and malononitrile (P3) were synthesized. In comparison with P2, P3 exhibits stronger UV–vis absorption and higher hole mobility. Polymer solar cells based on P3:PC71BM exhibit a power conversion efficiency of 1.33% under AM 1.5, 100 mW cm−2, which is three times of that based on P2:PC71BM. The higher efficiency is attributed to the reduced phase separation scale in P3:PC71BM blend. The aggregate domain size in P3:PC71BM blend is 50 nm, much smaller than that in P2:PC71BM blend (200 nm).

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