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Effect of branched alkyl chains attached at sp3 silicon of donor–acceptor copolymers on their morphology and photovoltaic properties

Authors

  • Tatsuaki Nakanishi,

    1. Photovoltaic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
    2. Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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  • Yasuhiro Shirai,

    Corresponding author
    1. Photovoltaic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
    2. Global Research Center for Environment and Energy Based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
    • Photovoltaic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
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  • Takeshi Yasuda,

    1. Photovoltaic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
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  • Liyuan Han

    Corresponding author
    1. Photovoltaic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
    2. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
    • Photovoltaic Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan
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Abstract

We study the degree of π−π interactions in two copolymers composed of 2-octylbenzotriazole and dialkyldithienosiloles with linear hexyl (P1) and branched 2-ethylhexyl groups (P2). Although the branched ethyl group can be positioned above the π-plane of dithienosilole to bring disadvantage to stack among the polymers, the solid-state absorption spectra of the polymers reveal that P2 possesses stronger interchain interactions than P1. We also evaluate the photovoltaic properties of each polymer with [6,6]-phenyl-C71-butyric acid methyl ester. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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