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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)498-503
Number of pages6
JournalCrystal Research and Technology
Issue number5
Publication statusPublished - May 2007


  • Photoconduction
  • Sol-gel
  • Thermally stimulated current
  • Titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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