Molecular Design of Coumarin Dyes for Efficient Dye-Sensitized Solar Cells

  title={Molecular Design of Coumarin Dyes for Efficient Dye-Sensitized Solar Cells},
  author={Kohjiro Hara and Tadatake Sato and Ryuzi Katoh and Akihiro Furube and Yasuyo Ohga and Akira Shinpo and Sadaharu Suga and Kazuhiro Sayama and Hideki Sugihara and Hironori Arakawa}
We have developed novel coumarin dyes for use in dye-sensitized nanocrystalline TiO 2 solar cells (DSSCs). The absorption spectra of these novel coumarin dyes are red-shifted remarkably in the visible region relative to the spectrum of C343, a conventional coumarin dye. Introduction of a methine unit ( -CHdCH-) connecting both the cyano ( -CN) and carboxyl ( -COOH) groups into the coumarin framework expanded the π conjugation in the dye and thus resulted in a wide absorption in the visible… CONTINUE READING
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