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IRRADIATION EFFECTS ON THE OPTICAL PROPERTIES OF a-Ge-Se-Ag THIN FILMS

S. K. Tripathi1,* , A. Thakur1, G. Singh1, J. Sharma1, V. Sharma1, K. P. Singh1, G. S. S. Saini1, N. Goyal1

Affiliation

  1. Centre of Advanced Study in Physics, Panjab University, Chandigarh-160 014, India

Abstract

The present paper reports the effect of proton irradiation on the optical properties of (Ge20Se80)0.96 Ag0.04 thin film. It has been observed that the proton irradiation changes the refractive index (n) and the oscillator strength (Ed). The data on the dispersion of the refractive index, n( ) have been calculated using the single-effective-oscillator model. We have observed an increase in Ed, static refractive index n(0), coordination number of the cation nearest neighbour of the anion Nc. Oscillator energy E0 decreases after the proton irradiation which indicate a decrease in the disorder of a-(Ge20Se80)0.96 Ag0.04 glassy alloy. The absorption coefficient ( ) has been calculated. The optical gap (Eg opt) and disorder parameter (B1/2) have been calculated from the intersection of the plot ( )1/2 vs. with the abscissa axis and the slope of the plots. The values of Eg opt and B1/2 decrease after proton irradiation. Results have been explained in terms of the structural changes due to the phase separation in thin films which are induced after the proton irradiation..

Keywords

Chalcogenide glasses, Proton irradiation, Optical properties.

Submitted at: July 4, 2005
Accepted at: July 21, 2005

Citation

S. K. Tripathi, A. Thakur, G. Singh, J. Sharma, V. Sharma, K. P. Singh, G. S. S. Saini, N. Goyal, IRRADIATION EFFECTS ON THE OPTICAL PROPERTIES OF a-Ge-Se-Ag THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 4, pp. 2095-2101 (2005)