Document Details

Document Type : Article In Journal 
Document Title :
Laser-induced changes on optical band gap of amorphous and crystallized thin films of Se75S25-xAGx
Laser-induced changes on optical band gap of amorphous and crystallized thin films of Se75S25-xAGx
 
Subject : Physics 
Document Language : English 
Abstract : Optical band gap of amorphous, crystallized, laser induced amorphous and laser induced crystallized films of Se75S25-xAgx (x=4, 6 and 8) glassy alloys was studied from absorption spectra. The amorphous and crystallized films were induced by pulse laser for 10 min. After laser irradiation on amorphous and crystalline films, optical band gap was measured. It has been found that the mechanism of the optical absorption follows the rule of indirect transition. The amorphous thin films show an increase in the optical band gap, while the crystallized (thermally annealed) thin films show a decrease in the optical band gap by inducing laser irradiation. Crystallization and amorphization of chalcogenide films were accompanied with the change in the optical band gap. The change in optical energy gap could be determined by identification of the transformed phase. These results are interpreted in terms of concentration of localized states due to shift in Fermi level. 
ISSN : 0921-4526 
Journal Name : Physica B: Condensed Matter 
Volume : 404 
Issue Number : 21 
Publishing Year : 1430 AH
2009 AD 
Article Type : Article 
Added Date : Wednesday, December 21, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أحمد عبدالله الغامديAl-Ghamdi, Ahmad AResearcherDoctorateAGAMDI@kau.edu.sa
شمشاد أحمد خانKhan, Shamshad AhmedResearcherDoctorateshamshad_phys@yahoo.com

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