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Synthesis and Photovoltaic Properties of a Donor-Acceptor Copolymer of Dithienosilole and 5,6-Bis(octyloxy)benzo[1,2,5]thiadiazole

Authors

  • Youguang Huang,

    1. Department of Chemistry, University of Science and Technology, Beijing 100083, China
    2. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Maojie Zhang,

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    • Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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  • Yan Jing,

    1. Department of Chemistry, University of Science and Technology, Beijing 100083, China
    2. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Huili Fan,

    Corresponding author
    1. Department of Chemistry, University of Science and Technology, Beijing 100083, China
    • Department of Chemistry, University of Science and Technology, Beijing 100083, China
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  • Xia Guo,

    1. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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  • Yongfang Li

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    • Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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Abstract

A donor-acceptor (D-A) copolymer, PDTSDOBT, based on dithienosilole and 5,6-bis(octyloxy)benzo[1,2,5]thiadiazole is synthesized by Pd-catalyzed Stille coupling reaction for application as a donor material in polymer solar cells (PSCs). The polymer shows good thermal stability, strong absorption in the visible region, and a relatively low bandgap of 1.63 eV. The hole mobility of PDTSDOBT as measured by SCLC is 5.58 × 10−4 cm2 V−1 s−1. The power conversion efficiency of a PSC based on PDTSDOBT: PC70BM (1:2 w/w) is 3.51% with a short-circuit current density of 8.96 mA cm−2, an open-circuit voltage of 0.69 V, and a fill factor of 0.568, under the 100 mW cm−2 AM1.5G illumination.

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