Nongeminate Recombination in All-Polymer Solar Cells with Different Crystallinities

HANDLE Open Access
  • Kim, Hyung Do
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Horiuchi, Yuya
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Iwasaki, Shinta
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Fukuhara, Tomohiro
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University
  • Ohkita, Hideo
    Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University

Abstract

One of the most challenging issues facing the organic photovoltaic community is to realize a high fill factor (FF) even with thick active layers. This is because the thick active layer is beneficial for photon absorption but makes charge collection difficult, which is primarily restricted by nongeminate recombination in solar cells. In this work, we have studied nongeminate recombination in four kinds of polymer solar cells based on blends of donor-conjugated polymers with different crystallinities and acceptor-conjugated polymers with a naphthalene diimide unit by using transient photovoltage and photocurrent techniques. As a result, we find that nongeminate recombination is considerably suppressed with an increasing degree of crystallinity of donor polymers, leading to a high FF of more than 0.6 even with an active layer thickness of 300 nm. The origin of such a phenomenon is further discussed in terms of variations in the states of mixed phases with a cascaded energy structure between crystalline domains and amorphous domains evaluated by conductive atomic force microscopy.

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Details 詳細情報について

  • CRID
    1050574570127864960
  • ISSN
    19448252
    19448244
  • HANDLE
    2433/265049
  • Text Lang
    en
  • Article Type
    journal article
  • Data Source
    • IRDB

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