Influence of the porosity on diffusion and lifetime in porous TiO 2 layers

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

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Photocurrent transients were investigated on pressed and sintered porous Ti O2 layers which were immersed in electrolyte during the measurements. Unpressed porous Ti O2 layers were prepared by electrophoretic deposition. The porosity of the layers was changed systematically by pressing. The surfaces of the Ti O2 nanoparticles and the intimate contact between them were identically conditioned by sintering in air at 450 °C after pressing. With decreasing porosity, the diffusion coefficient increased while the electron lifetime decreased. The results are discussed on the base of the change of the mean coordination number between Ti O2 nanoparticles.

Original languageEnglish
Article number182110
JournalApplied Physics Letters
Issue number18
StatePublished - 1 May 2006

Bibliographical note

Funding Information:
The authors are grateful to S. Dube and S. Bönisch from the Hahn-Meitner-Institute for implementing a system for logarithmic transient measurements. One of the authors (A.Z.) acknowledges the financial support provided by the Israel Science Foundation founded by The Israel Academy of Science and Humanities.


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