Novel Silafluorene-Based Conjugated Polymers with Pendant Acceptor Groups for High Performance Solar Cells

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• 作者：Chunhui Duan ; Wanzhu Cai ; Fei Huang ; Jie Zhang ; Ming Wang ; Tingbin Yang ; Chengmei Zhong ; Xiong Gong ; Yong Cao
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：June 22, 2010
• 年：2010
• 卷：43
• 期：12
• 页码：5262-5268
• 全文大小：847K
• 年卷期：v.43,no.12(June 22, 2010)
• ISSN：1520-5835

文摘

Two low-band-gap conjugated polymers, PSiFDCN and PSiFDTA, which consist of alternating silafluorene and triphenylamine backbone and different pendant acceptor groups (malononitrile and 1,3-diethyl-2-thiobarbituric acid) with styrylthiophene as π-bridge, were synthesized and characterized. By changing the acceptor groups in side chain, the energy levels, absorption spectra, and band gaps of the resulted polymers were effectively tuned. As the strength of the acceptors increases, the band gap reduces from 1.83 eV for PSiFDCN to 1.74 eV for PSiFDTA. Bulk heterojunction solar cells with these polymers as electron donor and (6,6)-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM) as electron acceptor exhibit high V_oc (>0.85 V) and power conversion efficiency (PCE) of 2.50% and 3.15% for PSiFDCN and PSiFDTA, respectively.