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Advanced Materials

Bithiophene Imide and Benzodithiophene Copolymers for Efficient Inverted Polymer Solar Cells

Authors

  • Nanjia Zhou,

    1. Department of Materials Science and Engineering, the Argonne-Northwestern Solar Energy Research Center, the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
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  • Xugang Guo,

    1. Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
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  • Rocio Ponce Ortiz,

    1. Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
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  • Shiqiang Li,

    1. Department of Materials Science and Engineering, the Argonne-Northwestern Solar Energy Research Center, the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
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  • Shiming Zhang,

    1. Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
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  • Robert P. H. Chang,

    Corresponding author
    1. Department of Materials Science and Engineering, the Argonne-Northwestern Solar Energy Research Center, the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
    • Department of Materials Science and Engineering, the Argonne-Northwestern Solar Energy Research Center, the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
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  • Antonio Facchetti,

    Corresponding author
    1. Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
    • Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA.
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  • Tobin J. Marks

    Corresponding author
    1. Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA
    • Department of Chemistry, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA.
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Abstract

Bithiophene imide (BTI) and benzodithiophene (BDT) copolymers are synthesized for application in organic photovoltaic (OPV) cells. The electron deficiency of the BTI units leads to polymers with a low-lying HOMOs (∼-5.6 eV). Inverted solar cells are fabricated to investigate the OPV performance of the BTI-based polymers and achieve power conversion efficiencies up to 5.5%, with substantial Vocs above 0.9 V which are among the highest Vocs reported to date for polymer/PCBM solar cells. The results indicate that the BTI is a promising building block for constructing polymer donors for OPV applications.

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