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Optical properties of multi-component arsenic-containing chalcogenide thin films

J. TASSEVA1,* , R. TODOROV1, D. TSANKOV2, K. PETKOV1

Affiliation

  1. Central Laboratory of Photoprocesses, Bulgarian Academy of Sciences, Acad. G. Bonchev St., bl 109, 1113 Sofia, Bulgaria
  2. Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev St., bl 9, 1113 Sofia, Bulgaria

Abstract

Results from investigations on multi-component vacuum evaporated thin As40S60-xSex (0<x<60) films are presented. The compositional dependence of the refractive index n and the absorption coefficient, α, have been studied. Linear dependences of n and the optical band gap, Eg, on the Se-content have been observed. In addition, in order to clarify the structure and to determine the interactions between the separate structural units, we have applied the single-oscillator model, proposed by Wemple and Di Domenico. Thus, the dispersion energy, Ed, single-oscillator energy, E0, and effective coordination number per cation, Nc, have been calculated. In agreement with other publications, we have observed Ed and Nc increasing with Se-content. The influence of light on the dispersion parameters has been demonstrated. Some conclusions on the photo-induced changes in the optical properties and the structure of As-S-Se films have been drawn from IR spectra..

Keywords

Chalcogenide glasses, Thin films, Optical properties.

Submitted at: Nov. 1, 2006
Accepted at: Feb. 15, 2007

Citation

J. TASSEVA, R. TODOROV, D. TSANKOV, K. PETKOV, Optical properties of multi-component arsenic-containing chalcogenide thin films, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 2, pp. 344-347 (2007)