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OPTICAL PROPERTIES OF THIN Ge – S – AgI FILMS

B. Monchev1,2, P. Petkov1,* , T. Petkova3, C. Popov2

Affiliation

  1. Department of Physics, Thin Film Technology Lab,University of Chemical Technology and Metallurgy, 8 “Kl. Ohridski” blvd., 1756 Sofia, Bulgaria
  2. University of Kassel (I M A), 40 Heinrich-Plett-Str., 34109 Kassel, Germany
  3. Institute of Electrochemistry&Energy Systems, BAS, Acad. G. Bonchev str. Bl.10, 1113 Sofia, Bulgaria

Abstract

Thin films of glassy (GeS2)1-x (AgI)x system have been studied. The films have been prepared from the respective bulk glasses previously synthesized from the elements with constant Ge:S=1:2 ratio and different amount of AgI (x= 5, 10, 15,20 mol.%). The amorphous nature of the films has been proved by X-ray diffraction (XRD) and electron microscope investigation. Spectral distribution of the film transmission has been obtained. Compositional dependence of the basic optical parameters has been derived. The optical energy gap Eg Tauc has been determined from the Tauc plot ahn=B(Eg Tauc – hn)2 and Eg 04 from the relationship a = f(hn). The values of Eg calculated by both methods show decrease with increasing of silver content. The influence of the third component on the thin film structure and optical absorption has been discussed..

Keywords

Germanium chalcogenides, Optical properties, Thin films, Band gap.

Submitted at: May 19, 2005
Accepted at: May 26, 2005

Citation

B. Monchev, P. Petkov, T. Petkova, C. Popov, OPTICAL PROPERTIES OF THIN Ge – S – AgI FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1293-1297 (2005)