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Synthesis and photovoltaic properties of alternative copolymers of benzo[1,2-b:4,5-b′]dithiophene and thiophene

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Abstract

Two conjugated polymers containing benzodithiophene (BDT) unit and the unit of thiophene or thieno[3,2-b]thiophene, P(BDT-T) and P(BDT-TT), were synthesized by Pd-catalyzed Stille coupling method. The UV–Vis absorption, thermal, and electrochemical properties of the two polymers were characterized. Photovoltaic properties of the polymers were studied by using the polymers as donor and PC70BM as acceptor with a weight ratio of polymer: PC70BM of 1:1.5. The power conversion efficiencies of the PSC devices based on P(BDT-T) reached 2.05% with an open-circuit voltage of 0.75 V, a short-circuit current of 4.5 mA cm−2, and a fill factor of 0.61, under the illumination of AM1.5, 100 mW cm−2.

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Acknowledgments

This study was supported by NSFC (Nos. 20874106, 20821120293) and Chinese Academy of Sciences.

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Authors and Affiliations

  1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Jie Min, Bo Peng, Youjun He, Maojie Zhang, Zhi-Guo Zhang, Jing Zhang, Xia Guo, Chaohua Cui, Dan Deng & Yongfang Li

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  1. Jie Min
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Correspondence to Yongfang Li.

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Min, J., Peng, B., He, Y. et al. Synthesis and photovoltaic properties of alternative copolymers of benzo[1,2-b:4,5-b′]dithiophene and thiophene. Polym. Bull. 68, 2107–2119 (2012). https://doi.org/10.1007/s00289-011-0672-z

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  • DOI: https://doi.org/10.1007/s00289-011-0672-z

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