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Benzochalcogenodiazole-Based Donor–Acceptor–Acceptor Molecular Donors for Organic Solar Cells

Authors

  • Hao-Chun Ting,

    1. Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)
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  • Yi-Hong Chen,

    1. Department of Materials Science and Engineering, National Tsing Hua University, Hsin Chu 30013 (Taiwan)
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  • Dr. Li-Yen Lin,

    1. Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)
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  • Shu-Hua Chou,

    1. Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)
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  • Yi-Hung Liu,

    1. Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)
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  • Prof. Hao-Wu Lin,

    Corresponding author
    1. Department of Materials Science and Engineering, National Tsing Hua University, Hsin Chu 30013 (Taiwan)
    • Hao-Wu Lin, Department of Materials Science and Engineering, National Tsing Hua University, Hsin Chu 30013 (Taiwan)

      Ken-Tsung Wong, Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)

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  • Prof. Ken-Tsung Wong

    Corresponding author
    1. Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)
    2. Institute of Atomic and Molecular Science Academia Sinica, Taipei 10617 (Taiwan)
    • Hao-Wu Lin, Department of Materials Science and Engineering, National Tsing Hua University, Hsin Chu 30013 (Taiwan)

      Ken-Tsung Wong, Department of Chemistry, National Taiwan University, Taipei 10617 (Taiwan)

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Abstract

Four new molecules with a donor–acceptor–acceptor (D-A-A) configuration, in which 2,1,3-benzoxadiazole or 2,1,3-benzoselenodiazole were adopted as the central bridging acceptor, were synthesized as electron donors for small-molecule organic solar cells. In conjunction with two previously reported 2,1,3-benzothiadiazole-based compounds, the influences of the benzochalcogenodiazole acceptor unit and the ditolylarylamine donor moiety on the molecular structure, electrochemical behavior, and optical properties of the materials were investigated systematically to obtain a clear structure–property relationship. Vacuum-deposited hybrid planar mixed-heterojunction devices fabricated with the new donors and C70 as the acceptor showed power conversion efficiencies in the range of 2.9–4.3 % under 1 sun (100 mW cm−2) AM 1.5 G simulated solar illumination. The current density–voltage characteristics of solar cells at various light intensities were measured, which revealed a high bimolecular recombination.

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