Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 354, Issue 35-39, Pages 4448-4457Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2008.06.069
Keywords
conductivity; transient photoconductivity; nanocrystalline; TiO2; N-doped TiO2; sol-gel
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Several sol-gel TiO2 thin films, N-doped and undoped, were prepared using the dip-coating technique. Dark conductivity in vacuum and in air gives information on the role of the adsorbed oxygen or water and the influence of nitrogen. Transient photoconductivity in vacuum and in air was studied with illumination time for various light intensities and found to be very sensitive to the environment. The rise and decay are much faster in air than in vacuum, suggesting the predominant mechanism of conduction in each case. The role of the presence of nitrogen is also discussed. (C) 2008 Elsevier B.V. All rights reserved.
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