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A Solution Processable D-A-D Molecule based on Thiazolothiazole for High Performance Organic Solar Cells

Authors

  • Qinqin Shi,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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  • Pei Cheng,

    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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  • Yongfang Li,

    Corresponding author
    1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
    • Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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  • Xiaowei Zhan

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

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A new linear, D-A-D small molecule based on thiazolothiazole has been synthesized. It exhibits excellent thermal stability and relatively low HOMO level. By tuning donor to acceptor ratio and thermal annealing, photovoltaic devices based on the blend of this compound and PC71BM exhibited perfect phase separation sizes (10–20 nm) and balanced charge transport (electron mobility/hole mobility = 2:1), which leads to power conversion efficiencies as high as 3.73%, among the top reported for solution processed organic solar cells based on small molecules.

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