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OPTICAL AND ELECTROCHROMIC CHARACTERIZATION OF MULTILAYERED MIXED METAL OXIDE THIN FILMS

F. Hamelmann1, K. Gesheva2,* , T. Ivanova2, A. Szekeres3, M. Abrashev4, U. Heinzmann1

Affiliation

  1. University of Bielefeld, Department of Physics, 100 131, 33501 Bielefeld, Germany
  2. Central Laboratory of Solar Energy and New Energy Sources – BAS, Sofia, Bulgaria
  3. Institute of Solid State Physics – BAS, Sofia, Bulgaria
  4. Faculty of Physics, Sofia University, Sofia, Bulgaria

Abstract

The paper presents results on the preparation and study of the structure, optical and electrochromic properties of sol-gel derived thin films of WO3, MoO3, and mixed films on based upon these. The films were deposited in a simplified sol-gel process. Raman spectra results showed that WO3 and the mixed films were predominantly amorphous, while crystallization of the MoO3 films was detected. All films showed an electrochromic effect. Color efficiencies were in the range 58 to 100 cm2/mC for a wavelength of 550 nm, reaching a value of 130 cm2/mC for the WO3 film. The results confirm that the simple sol-gel process which has been developed is promising for low cost applications in electrochromic smart windows..

Keywords

Sol-gel thin films, Raman spectra, Electrochromic properties.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

F. Hamelmann, K. Gesheva, T. Ivanova, A. Szekeres, M. Abrashev, U. Heinzmann, OPTICAL AND ELECTROCHROMIC CHARACTERIZATION OF MULTILAYERED MIXED METAL OXIDE THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 393-396 (2005)