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Advanced Materials

End-Capping Effect of a Narrow Bandgap Conjugated Polymer on Bulk Heterojunction Solar Cells

Authors

  • Jin Kuen Park,

    1. Department of Chemistry & Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, USA
    Current affiliation:
    1. J.K.P. and J.J. made equal contributions to this work (co-first author).
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  • Jang Jo,

    1. Department of Physics, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106–5090, USA
    Current affiliation:
    1. J.K.P. and J.J. made equal contributions to this work (co-first author).
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  • Jung Hwa Seo,

    1. Department of Chemistry & Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, USA
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  • Ji Sun Moon,

    1. Department of Physics, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106–5090, USA
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  • Yeong Don Park,

    1. Department of Chemistry & Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, USA
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  • Kwanghee Lee,

    1. Heeger Center for Advanced Materials, Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500–712, Korea
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  • Alan J. Heeger,

    Corresponding author
    1. Department of Physics, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106–5090, USA
    • Department of Physics, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106–5090, USA
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  • Guillermo C. Bazan

    Corresponding author
    1. Department of Chemistry & Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, USA
    • Department of Chemistry & Biochemistry, Department of Materials, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, USA.
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Abstract

Device performances of BHJ solar cells based on poly[(4,4-didodecyldithieno[3,2-b:2’,3’-d]silole)-2,6-diyl-alt-(2,1,3-benzoxadiazole)-4,7-diyl]and PC71BM improve by capping the chain ends with thiophene fragments. This structural modification yields materials that are more thermally robust and that can be used in devices with thicker films – important considerations for enabling the mass production of plastic solar cells.

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