Photoelectrical properties of crystalline titanium dioxide thin films after thermo-annealing by R. Sathyamoorthy, P. Sudhagar, S. Chandramohan, and K. P. Vijayakumar

Crystal Research and Technology

Cryst. Res. Technol. 42, 498 (2007) - Abstract -

Photoelectrical properties of crystalline titanium dioxide thin films after thermo-annealing

R. Sathyamoorthy, P. Sudhagar, S. Chandramohan, and K. P. Vijayakumar*

PG and Research Department of Physics, Kongunadu Arts and Science College, Coimbatore, Tamilnadu 641029, India
*Department of Physics, Cochin University of Science and Technology (CUSAT), Cochin- 22, India

Keywords	sol-gel, titanium dioxide, thermally stimulated current, photoconduction
PACS	81.20.Fw, 73.50.Gr, 73.50.Pz
DOI	10.1002/crat.200610855

This paper reports the photoelectrical properties of sol gel derived titanium dioxide (TiO₂) thin films annealed at different temperatures (425-900°C). The structure of the as-grown film was found to be amorphous and it transforms to crystalline upon annealing. The trap levels are studied by thermally stimulated current (TSC) measurements. A single trap level with activation energy of 1.5 eV was identified. The steady state and transient photocurrent was measured and the results are discussed on the basis of structural transformation. The photocurrent was found to be maximum for the films annealed at 425°C and further it decreases with annealing at higher temperatures. The photoconduction parameters such as carrier lifetime, lifetime decay constant and photosensitivity were calculated and the results are discussed as a function of annealing temperature.

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