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Photoconductivity in sol-gel TiO2 thin films with and without ammonia treatment

Vomvas A., Pomoni K., Trapalis C., Todorova N.

Materials Science Poland

2007

Vol. 25, No. 3

809--816

Thin TiO2 sol-gel films, with and without ammonia treatment, were prepared using the dip-coating technique and then heat treated at 500 oC. The time dependences of the photoconductivity at various light intensities were studied in vacuum and in air at 27 oC. The transient photoconductivity is very sensitive to the environment and dramatically higher than the dark one for samples both in vacuum and in air. The results are discussed in terms of the competition of the photogeneration, recombination, thermal release, and the influence of NH3 treatment.