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Time Evolution of Photoconductivity in TiO2 Electrodes Fabricated by a Sol Gel Method

Published online by Cambridge University Press:  01 February 2011

Zhibin Xie ,
Victor M Burlakov ,
Bernard M. Henry ,
Kiril R. Kirov ,
Christopher R. M. Grovenor ,
Hazel E. Assender ,
G. Andrew ,
D. Briggs ,
Mitsuru Kano  and
Yusuke Tsukahara
Zhibin Xie*
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Victor M Burlakov
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Bernard M. Henry
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Kiril R. Kirov
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Christopher R. M. Grovenor
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Hazel E. Assender
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
G. Andrew
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
D. Briggs
Affiliation:
: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Mitsuru Kano
Affiliation:
: Technical Research Institute, Toppan Printing Co., Ltd., Takanodai-Minami 4–2–3, Sugito-machi, Kitakatsushika-gun, Saitama 345, Japan
Yusuke Tsukahara
Affiliation:
: Technical Research Institute, Toppan Printing Co., Ltd., Takanodai-Minami 4–2–3, Sugito-machi, Kitakatsushika-gun, Saitama 345, Japan
*
(1): Corresponding author Email: [email protected] Tel: +44 1865 273699 Fax: +44 1865 273789
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Abstract

We report here on the time evolution of photoconductivity under continuous illumination in nanocrystalline TiO2 samples prepared by a sol gel method, and also on the conductivity decay once the illumination is switched off. We observe strong dependence of the photoconductivity on the illumination intensity for both processes. It is found that the conductivity decay after high-intensity illumination is slower than after low-intensity illumination, and we have attempted to explain these experimental results using a model involving hole trapping-detrapping processes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 836: Symposium L – Materials for Photovoltaics , 2004 , L2.4
Copyright
Copyright © Materials Research Society 2005

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References

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