Influence of Ordering in Porous TiO2 Layers on Electron Diffusion

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• 作者：Shay Tirosh ; Thomas Dittrich ; Ashi Ofir ; Larisa Grinis ; Arie Zaban
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：August 24, 2006
• 年：2006
• 卷：110
• 期：33
• 页码：16165 - 16168
• 全文大小：170K
• 年卷期：v.110,no.33(August 24, 2006)
• ISSN：1520-5207

文摘

Layers of porous TiO₂ fabricated by electrophoretic deposition at different temperatures with subsequentsintering in air were investigated by transient photocurrent measurements in aqueous electrolyte. The effectivediffusion coefficient of excess electrons changed between 1.6 × 10^-5 and 1.4 × 10^-4 cm²/s depending stronglyon the solution temperature during the TiO₂ layer deposition. Characterization, in terms of average degree ofpreferred orientation, shows that low deposition temperature results in orientation of the nanocrystals formingthe porous film. Consequently, the increase of effective diffusion coefficient is attributed to a higher degreeof ordering in the nanoporous TiO₂ layer.