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THEORETICAL INVESTIGATION OF THE OPTICAL PROPERTIES OF Ge20Se80-XBiX THIN FILMS

P. Sharma1,* , M. Vashistha2, I. P. Jain3

Affiliation

  1. Govt. Girls (PG) College, Sri Ganganagar–335001, Rajasthan, India
  2. P.N.D. College, Gajsinghpur, Sri Ganganagar, Rajasthan, India
  3. Centre for non-conventional energy resources, University of Rajasthan, Jaipur-302004, India

Abstract

The structure of the glassy Ge20Se80-xBix glassy alloys has been examined theoretically. The experimentally observed and the theoretically calculated optical band gap Eg in the amorphous Ge20Se80-xBix system prepared in vacuum with x = 0, 4, 6, 8, 10, 12. were found to be in good agreement. Besides all these a relationship between the glass transition temperature and Eg has been established. The effective coordination number, number of constraints, number of excess Se-Se bonds , the cohesive energies of the bonds, average heat of atomization, theoretical optical band gap and the band gap and dispersion energy based on WDD model has been calculated for the Ge20Se80-xBix system..

Keywords

Chalcogenides, Optical band gap, Germanium selenide, Heat of atomization, Glass transition temperature, Chemical bond approach.

Submitted at: Nov. 11, 2005
Accepted at: Nov. 24, 2005

Citation

P. Sharma, M. Vashistha, I. P. Jain, THEORETICAL INVESTIGATION OF THE OPTICAL PROPERTIES OF Ge20Se80-XBiX THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 6, pp. 2963-2969 (2005)