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

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

doi:10.1063/1.2201045

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

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

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 language	English
Article number	182110
Journal	Applied Physics Letters
Volume	88
Issue number	18
DOIs	https://doi.org/10.1063/1.2201045
State	Published - 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.

Funding

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.

Funders	Funder number
Israel Academy of Sciences and Humanities
Israel Science Foundation

Access to Document

10.1063/1.2201045

Cite this

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abstract = "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.",

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AU - Zaban, A.

N1 - 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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N2 - 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.

AB - 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.

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