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Optical band gap and optical constants in amorphous Se70Te30-xAgx thin films

V. PANDEY1, S. K. TRIPATHI1, A. KUMAR2,*

Affiliation

  1. Department of Physics, Harcourt Butler Technological institute, Kanpur-208 002, India
  2. Department of Physics, Panjab University, Chandigarh-160 014, India

Abstract

This paper reports the study of optical properties of some Ag doped Se-Te chalcogenides glasses of Se70Te30-xAgx (x = 2, 6 & 8). The optical transmission spectra of maxima and minima are measured in the wavelength range 400-2000 nm. It is found that optical band gap (Eg) increases with Ag-content and refractive index (n), extinction coefficient (k), dielectric constants [real (ε) & imaginary (ε”) both] and absorption coefficient (α) decreases with Ag-content. A correlation between optical band gap (Eg) and electronegativity (Xc) of the alloys indicates that the optical band gap (Eg) increases with the decrease of electronegativity (Xc). Data are analyzed by Swanpoel method..

Keywords

Chalcogenide glasses, Optical properties and Optical band gap.

Submitted at: Feb. 9, 2006
Accepted at: March 23, 2006

Citation

V. PANDEY, S. K. TRIPATHI, A. KUMAR, Optical band gap and optical constants in amorphous Se70Te30-xAgx thin films, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 789-793 (2006)