Efficiencies of Electron Injection from Excited N3 Dye into Nanocrystalline Semiconductor (ZrO2, TiO2, ZnO, Nb2O5, SnO2, In2O3) Films
The Journal of Physical Chemistry B2004Vol. 108(15), pp. 4818–4822
Citations Over TimeTop 10% of 2004 papers
Ryuzi Katoh, Akihiro Furube, Toshitada Yoshihara, Kohjiro Hara, Gaku Fujihashi, Shingo Takano, Shigeo Murata, Hironori Arakawa, M. Tachiya
Abstract
The efficiency of electron injection from excited N3 dye (cis-bis-(4,4‘-dicarboxy-2,2‘-bipyridine) dithiocyanato ruthenium(II), Ru(dcbpy)2 (NCS)2), into various nanocrystalline semiconductor (ZrO2, TiO2, ZnO, Nb2O5, SnO2, In2O3) films was studied by transient absorption spectroscopy. For TiO2, ZnO, Nb2O5, SnO2, or In2O3 films, injection efficiencies were found to be very high; for ZrO2 film, the efficiency was very low. These findings indicate that electron injection occurs efficiently if the LUMO level of N3 dye is located sufficiently far above the bottom of the conduction band of the semiconductor film. On the basis of the results, we discuss the reason TiO2 exhibits higher solar cell performance than other materials.
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