Influence of sintering temperature, pressing, and conformal coatings on electron diffusion in electrophoretically deposited porous TiO2

A. Ofir, Th Dittrich, S. Tirosh, L. Grinis, A. Zaban

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Abstract

The electrophoretic deposition of nanoporous Ti O2 layers allows us to investigate separately the influence of sintering temperature, porosity, and conformal surface coatings on the effective diffusion coefficient (Deff) of excess electrons in porous layers. Photocurrent transients were measured to obtain Deff in nanoporous Ti O2 layers immersed in aqueous electrolyte. The applied treatments control parameters such as the contact between interconnected nanoparticles, the coordination of nanoparticles in the porous network, and the surface passivation of Ti O2 nanoparticles. The hierarchy of the different factors for transport optimization in porous Ti O2 is discussed. Under fixed geometry of the nanoporous network, trapping on surface states can strongly limit electron diffusion in porous Ti O2.

Original languageEnglish
Article number074317
JournalJournal of Applied Physics
Volume100
Issue number7
DOIs
StatePublished - 2006

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