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Optical properties of silver doped amorphous films of composition Ge28S72 and Ge22Ga6S72

M. BARTOS1,* , T. WAGNER1, S. VALKOVA1, M. PAVLISTA1, M. VLCEK2, L. BENEŠ3, M. FRUMAR1

Affiliation

  1. University of Pardubice, Faculty of Chemical Technology, Department of General and Inorganic Chemistry, Legions’ sq. 565, 53210 Pardubice, Czech Republic
  2. Institute of Macromolecular Chemistry of Academy of Sciences of Czech Rep. v.v.i. and University of Pardubice, Studentská 84, 53210 Pardubice, Czech Republic
  3. University of Pardubice, Faculty of Chemical Technology, Joint Laboratory of Solid State Chemistry, Studentska 95, 53210 Pardubice, Czech Republic

Abstract

Thin films of Ge28S72 and Ge22Ga6S72 prepared by pulsed laser deposition were doped with silver in three steps. Each step includes deposition of a 10 nm thick silver thin film by thermal evaporation and its dissolution into chalcogenide thin films by photodiffusion. Undoped and doped thin films were characterized by using a Spectral ellipsometer VASE, a UV/VIS spectrometer, X-Ray diffraction analysis and Energy dispersive X-Ray analysis but only optical characterization is present in this paper. Substitution of Ge by atoms Ga leads into increasing of the refractive index and the red shift of short-wavelength cut-off edge. Adding silver leads to another increase of the refractive index and the red shift of short-wavelength cut-off edge. Due to high thickness of chalcogenide thin films (at least 500 nm) such amount of silver was not sufficient for creating homogenous thin films and thin films with a graded refractive index were created..

Keywords

Ge-S, Optical properties, Ag-doped.

Submitted at: June 10, 2011
Accepted at: Nov. 23, 2011

Citation

M. BARTOS, T. WAGNER, S. VALKOVA, M. PAVLISTA, M. VLCEK, L. BENEŠ, M. FRUMAR, Optical properties of silver doped amorphous films of composition Ge28S72 and Ge22Ga6S72, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 11-12, pp. 1442-1446 (2011)