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EXCIMER LASER INDUCED PHOTO-THERMAL CHANGES OF SOL-GEL TiO2 THIN FILMS

V. Yordanova1,* , K. Starbova1, W. Hintz2, J. Tomas2, U. Wendt3

Affiliation

  1. Central Laboratory of Photoprocesses, Academy of Sciences, 1040 Sofia, Bulgaria
  2. Mechanical Process Engineering, Otto-von-Guericke University, 39106 Magdeburg, Germany
  3. Laboratory of Scanning Microscopy and Stereology, Otto-von-Guericke University, 39106 Magdeburg, Germany

Abstract

Nanostructured sol-gel TiO2 thin films spin coated on Na-Ca silicate glass plates are investigated. The films are irradiated by means of excimer (KrF*) pulsed laser irradiation with different pulse number at a constant laser energy density. The surface morphology of the virgin and laser processed films are followed applying electron optical imaging and atomic force microscopy. The evolution of the surface roughness and pore formation as a result of the laser absorption is demonstrated. The changes in the morphology of laser irradiated samples are found to be accompanied by an optical absorption edge shift to the infrared wavelength range as evidenced by optical spectrophotometric measurements. Conventional X-ray diffraction analysis is applied in order to obtain information on the structure and phase composition. It is established that an intense peak position of anatase phase of the nonirradiated sol-gel films is shifted to lower 2q range thus evidencing the occurrence of phase transition during the laser modification. The results obtained reveal a new laser stimulated processing route for designing sol-gel titania films with high surface roughness degree and extended, infrared spectral sensitivity..

Keywords

Titania, sol-gel thin films, Excimer laser modification.

Submitted at: Aug. 25, 2005
Accepted at: Sept. 22, 2005

Citation

V. Yordanova, K. Starbova, W. Hintz, J. Tomas, U. Wendt, EXCIMER LASER INDUCED PHOTO-THERMAL CHANGES OF SOL-GEL TiO2 THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2601-2606 (2005)