Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10249309 | Solar Energy Materials and Solar Cells | 2005 | 10 Pages |
Abstract
We have investigated the influence of electrolyte composition on the photovoltaic performance of a dye-sensitized nanocrystalline TiO2 solar cell (DSSC) based on a Ru(II) terpyridyl complex photosensitizer (the black dye). We have also spectroscopically investigated the interaction between the electrolyte components and the adsorbed dye. The absorption peaks attributed to the metal-to-ligand charge transfer transitions of the black dye in solution and adsorbed on a TiO2 film, were red-shifted in the presence of Li cations, which led to an expansion of the spectral response of the solar cell toward the near-IR region. The photovoltaic performance of the DSSC based on the black dye depended remarkably on the electrolyte composition. We developed a novel efficient organic liquid electrolyte containing an imidazolium iodide such as 1,2-dimethyl-3-n-propylimidazolium iodide or 1-ethyl-3-methylimidazolium iodide (EMImI) for a DSSC based on the black dye. A high solar energy-to-electricity conversion efficiency of 9.2% (Jsc=19.0Â mAÂ cmâ2, Voc=0.67Â V, and FF=0.72) was attained under AM 1.5 irradiation (100Â mWÂ cmâ2) using a novel electrolyte consisting of 1.5Â M EMImI, 0.05Â M iodine, and acetonitrile as a solvent with an antireflection film.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Kohjiro Hara, Takeshi Nishikawa, Mitsuhiko Kurashige, Hiroshi Kawauchi, Takeo Kashima, Kazuhiro Sayama, Kenichi Aika, Hironori Arakawa,