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INFLUENCE OF THERMAL ANNEALING IN AIR ON THE STRUCTURAL AND OPTICAL PROPERTIES OF AMORPHOUS ANTIMONY TRISULFIDE THIN FILMS

N. Tigau1,* , V. Ciupina2, G. Prodan2, G. I. Rusu3, C. Gheorghies1, E. Vasile4

Affiliation

  1. Faculty of Science, “Dunarea de Jos” University, Galati, R-6200, Romania
  2. “Ovidius” University, Constanta, R-8700, Romania
  3. Faculty of Physics, “Alexandru Ioan Cuza” University, Iasi, R-6600, Romania
  4. S.C. METAV S.A, Bucuresti, R-7200, Romania

Abstract

Amorphous antimony trisulfide films were deposited on glass using thermal vacuum evaporation technique at substrate temperatures TS = 300 K. The films were annealed in air at a temperature of 500 K for 30 minutes. The structure and chemical composition of films were determined by X-ray and electron microscopy investigations. The films are composed of an amorphous structure that includes nanocrystallites of antimony trioxide. The amorphous as deposited films transform into polycrystalline films during treatment above 500 K. Absorption coefficients of the films were determined using spectrophotometric measurements of the transmittance, T, at normal incidence in the spectral range 460-1400 nm. The optical properties of amorphous film differ substantially from those of polycrystalline films, after heat treatment the direct energy band gap decreases from 2.46 eV to 2.40 eV and the indirect band gap from 1.64 eV to 1.20 eV, respectively..

Keywords

Antimony trisulfide, Transmission electron microscopy, Optical properties.

Submitted at: May 23, 2003
Accepted at: March 15, 2004

Citation

N. Tigau, V. Ciupina, G. Prodan, G. I. Rusu, C. Gheorghies, E. Vasile, INFLUENCE OF THERMAL ANNEALING IN AIR ON THE STRUCTURAL AND OPTICAL PROPERTIES OF AMORPHOUS ANTIMONY TRISULFIDE THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 1, pp. 211-217 (2004)