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Theoretical analysis of physical parameters of group VI amorphous semiconductors

ISHU SHARMA1,*

Affiliation

  1. Department of Physics, Amity University Dubai Campus, Dubai International Academic City, Dubai, UAE

Abstract

Physical properties and their correlation with optical parameters for a-Ga20Se80-xBix (x = 0, 5, 10, 15, 20) glassy alloys were discussed. It was found that increase in density accounts for the concurrent increase in refractive index values with addition of Bi. Number of atoms per unit volume (N) was calculated and was found to increase with Bi concentration. This increase in N accounts for the subsequent decrease in optical band gap. A linear relation was found between cohesive energy and optical band gap (calculated experimentally and theoretically). Decrease of electro-negativity also supported the decrease of optical band gap. The relationship between the optical band gap and chemical composition in a-Ga-Se-Bi glasses was also examined. Mean bond energy and glass transition temperature exhibited relatively sharp maxima at chemical threshold and thereby shows the stability of the system..

Keywords

Chalcogenide glasses, Density, Structure compactness, Cohesive energy, Theoretical band gap.

Submitted at: March 21, 2012
Accepted at: June 6, 2012

Citation

ISHU SHARMA, Theoretical analysis of physical parameters of group VI amorphous semiconductors, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 5-6, pp. 483-490 (2012)