論文

2020年10月

The effect of a two-dimensional structure on the dielectric constant and photovoltaic characteristics

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
  • Kenji Mishima
  • ,
  • Taishi Sakai
  • ,
  • Kazumichi Yokota
  • ,
  • Masateru Taniguchi
  • ,
  • Yoshio Aso
  • ,
  • Yutaka Ie
  • ,
  • Koichi Yamashita

401
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jphotochem.2020.112756
出版者・発行元
ELSEVIER SCIENCE SA

Along with the recent intensive studies on improvements in organic solar cell efficiency, a new material design concept of organic semiconductors has become important for the practical realization of solar cells. Donor materials with a high dielectric constant that markedly boost the efficiency have been proposed, but theoretical material designs and/or experimental results are still scarce. In this paper, we report on a combined theoretical and experimental result of donors with high dielectric constants. Our design guidelines were to bind a conventional one-dimensional thiophene-based donor molecule in a two-dimensional (2D) manner, which would lead to extended pi-conjugation and a large dielectric constant. Impedance spectroscopy measurements showed that the relative dielectric constant increased unilaterally with extending the 2D structure. Organic solar cells based on these materials in the combination of [6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM) show that an increase in power-conversion efficiency was observed experimentally with increasing the extension of the molecular structure. These sults imply that this is a potentially promising design strategy for the 2D extension of the molecules, and it eventually leads to a high dielectric constant and to an efficient power conversion of the organic solar cell material.

リンク情報
DOI
https://doi.org/10.1016/j.jphotochem.2020.112756
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000573273600001&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.jphotochem.2020.112756
  • ISSN : 1010-6030
  • Web of Science ID : WOS:000573273600001

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