Abstract
Nanocrystalline TiO 2 colloids were prepared by hydrothermalization. The porosity and the size distribution of the particles increase with a longer hydrothermalization reaction period. The particle size decreases with lower reaction temperature. Electron transport in nanocrystalline TiO 2 film electrodes sensitized with [NBu 4] 2[Ru(Htcterpy)(NCS) 3] ([NBu 4] + = tetrabutylammonium cation; H 3tcterpy = 4,4′,4″-tricarboxy-2,4:2′,4′:2″-terpyridine) (black dye) was investigated from the standpoint of TiO 2 particle properties such as particle size, size distribution, and porosity. When the size distribution and the porosity were comparable, the electron lifetime ( τ rec) increased and the electron diffusion coefficient ( D) decreased at smaller particle sizes. The value of D decreased when the porosity increased. Large differences in the diffusion length ( L = D τ rec ) among the TiO 2 films were observed. However, J sc did not depend on L. Thus, we conclude that the J sc values were more effectively influenced by the absorption coefficient ( α) than by L.
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