Organic Photovoltaics Based on Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s (第57回論文特集号 有機系および有機 : 無機太陽電池の現状と課題) Organic Photovoltaics Based on Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s

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Author(s)

    • YASUDA Takeshi 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 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

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:PC<sub>70</sub>BM exhibited a short-circuit current density (<i>J</i><sub>sc</sub>) of 3.30 mA cm<sup>−2</sup>, an open-circuit voltage (<i>V</i><sub>oc</sub>) of 0.52 V, and a power conversion efficiency of 0.91%, as compared to 1.62 mA cm<sup>−2</sup>, 0.68 V, and 0.45%, respectively, for OPVs using PPhDOTFV:PC<sub>70</sub>BM. The <i>J</i><sub>sc</sub> value of PPhDOTV-based OPVs was higher than that of PPhDOTFV-based OPVs because of a large LUMO energy offset between PPhDOTV and PC<sub>70</sub>BM. On the other hand, the <i>V</i><sub>oc</sub> 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 PC<sub>70</sub>BM.

Journal

  • Electrochemistry

    Electrochemistry 85(5), 241-244, 2017

    The Electrochemical Society of Japan

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