Simple oligothiophene-based dyes for dye-sensitized solar cells (DSSCs): Anchoring group effects on molecular properties and solar cell performance

Eigo Miyazaki, Takashi Okanishi, Yuki Suzuki, Nozomi Ishine, Hiroki Mori, Kazuo Takimiya, Yutaka Harima

研究成果: Article査読

18 被引用数 (Scopus)

抄録

Simple oligothiophene-based dyes with a cyanoacrylic acid anchor were synthesized and evaluated as a photosensitizer for dye-sensitized solar cells (DSSCs). Although the molecular properties of the dyes at a glance are quite similar to those of related oligothiophene dyes with a carboxylic acid anchor, the DSSC performance of the former (up to η = 4.8%) is fairly improved over the latter (1.2%). Absorption spectra of the oligothiophene dyes with the cyanoacrylic acid are red-shifted compared to those with the carboxylic acid, resulting in the improved photocurrent conversion efficiency at above 600nm in the DSSCs. With the aid of theoretical calculations, electronic properties of the oligothiophene dyes were investigated, and it turned out that the excited states of the dyes are significantly affected by the anchoring groups. The cyanoacrylic acid anchor brings about a stabilized LUMO with localized electron density on the cyanoacrylic acid moiety, whereas the carboxylic acid dye has relatively a high-lying LUMO with delocalized electron density over the oligothiophene moiety. Thus, the difference in the DSSC performance is rationalized by the different electronic structure at the excited states caused by the anchoring groups on the oligothiophene cores.

本文言語English
ページ(範囲)459-465
ページ数7
ジャーナルBulletin of the Chemical Society of Japan
84
5
DOI
出版ステータスPublished - 2011
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)

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