Organic Photovoltaics Based on Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s

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  • SHIBASAKI Kosuke
    Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba
  • YASUDA Takeshi
    Research Center for Functional Materials, National Institute for Materials Science (NIMS) Tsukuba Research Center for Interdisciplinary Materials Science, University of Tsukuba
  • KIJIMA Masashi
    Tsukuba Research Center for Interdisciplinary Materials Science, University of Tsukuba Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba

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Abstract

Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s with a fluorine substituent at the phenylene moiety (PPhDOTFV) and without the substituent (PPhDOTV) were synthesized by Stille coupling polymerization. They exhibited good solubility in common organic solvents owing to a branched alkyl chain at the phenylene moiety and a narrow optical bandgap of 1.66 eV due to an increased conjugated length caused by the vinylene bridge. Both the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of PPhDOTFV were 0.2 eV deeper than those of PPhDOTV. Organic photovoltaic cells (OPVs) using PPhDOTV:PC70BM exhibited a short-circuit current density (Jsc) of 3.30 mA cm−2, an open-circuit voltage (Voc) of 0.52 V, and a power conversion efficiency of 0.91%, as compared to 1.62 mA cm−2, 0.68 V, and 0.45%, respectively, for OPVs using PPhDOTFV:PC70BM. The Jsc value of PPhDOTV-based OPVs was higher than that of PPhDOTFV-based OPVs because of a large LUMO energy offset between PPhDOTV and PC70BM. On the other hand, the Voc value of PPhDOTV-based OPVs was lower than that of PPhDOTFV-based OPVs because of a small energy difference between the HOMO level of PPhDOTV and the LUMO level of PC70BM.

Journal

  • Electrochemistry

    Electrochemistry 85 (5), 241-244, 2017

    The Electrochemical Society of Japan

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