Enhanced Performance of Organic Photovoltaic Cells Fabricated with a Methyl Thiophene-3-Carboxylate-Containing Alternating Conjugated Copolymer

Authors

  • Min Ju Cho,

    1. Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
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  • Jangwon Seo,

    1. Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
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  • Kyung Hwan Kim,

    1. Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 136-701, Korea
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  • Dong Hoon Choi,

    1. Department of Chemistry, Research Institute for Natural Sciences, Korea University, Seoul 136-701, Korea
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  • Paras N. Prasad

    Corresponding author
    1. Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
    • Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260, USA.
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Abstract

A new donor-acceptor copolymer, containing benzodithiophene (BDT) and methyl thiophene-3-carboxylate (3MT) units, is designed and synthesized for polymer solar cells (PSCs). The 3MT unit is used as an electron acceptor unit in this copolymer to provide a lower highest occupied molecular orbital (HOMO) level for obtaining polymer solar cells with a higher open-circuit voltage (VOC). The resulting bulk heterojunction PSC made of the copolymer and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) exhibits a power conversion efficiency (PCE) up to 4.52%, a short circuit current (JSC) of 10.5 mA·cm-2, and a VOC of 0.86 V.

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