Side-Chain Tunability via Triple Component Random Copolymerization for Better Photovoltaic Polymers

Authors

  • Wei-Hsuan Chang,

    1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
    2. California Nano Systems Institute, University of California Los Angeles, Los Angeles, CA, USA
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  • Jing Gao,

    1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
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  • Letian Dou,

    1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
    2. California Nano Systems Institute, University of California Los Angeles, Los Angeles, CA, USA
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  • Chun-Chao Chen,

    1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
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  • Yongsheng Liu,

    1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
    2. California Nano Systems Institute, University of California Los Angeles, Los Angeles, CA, USA
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  • Yang Yang

    Corresponding author
    1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
    2. California Nano Systems Institute, University of California Los Angeles, Los Angeles, CA, USA
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Abstract

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Using a triple component random copolymerization approach, the amount of triethylene glycol (TEG) side chain, which can be regarded as a stack-inducing agent, is introduced precisely into a given polymer backbone. TEG side chains result in a more favorable morphology in a polymer:fullerene blend. Based on the low-bandgap photovoltaic polymer PBDTT-DPP (PBD), this methodology can bring a 10% overall improvement in power conversion efficiency (PCE).

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