Laser Irradiation Effect on the Optical Band Gap of Se-Te-Al Thin Films
Journal: International Annals of Science (Vol.1, No. 1)Publication Date: 2016-10-01
Authors : Adam A Bahishti; Islam Uddin; M. Zulfequar;
Page : 8-14
Keywords : Laser Irradiation; Chalcogenide alloy; Thin films; Irradiation effect; optical band gap; Se-Te-Al system;
Abstract
Laser irradiation effect on the optical band gap of Se-Te-Al thin films has been studied. Optical data Analysis of thin films indicates indirect allowed transition in the Se-Te-Al system. Analysis of the result reveals that the optical band gap decreases with increasing irradiation time as well as Aluminum content. However, laser irradiation does not show a significant effect at higher Aluminum concentration. It might be due to lack of weak Se-Te bond as Te content decreases with increasing Al content. It shows that alloy with rich Al content is more stable against laser irradiation. It is also observed that absorption coefficient and extinction coefficient increases with laser irradiation time.
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