Document Details

Document Type : Article In Journal 
Document Title :
Optical properties of Ge–Se–Te wedge-shaped films by using only transmition spectra
لخصائص الضوئية لأغشية رقيقة بشكل الويدج من جرمانيوم سيللينيوم - تيليريوم باستخدام قياس النفاذية فقط
 
Subject : Opical propetise of (Wedge transmittance)chalcogenides 
Document Language : English 
Abstract : Amorphous Ge10Se90xTex (with x = 0, 5, 10 and 15 at.%) thin films were prepared by thermal evaporation method. The optical transmission spectra of these films were measured in the wavelength range of 500– 2500 nm in order to drive the refractive index and the absorption coefficient of these films. Applying the analytical expressions proposed by Swanepoel, enabling the calculations of optical constants of thin films with non-uniform thickness with high accuracy. Furthermore, the dispersion of the refractive index is discussed in terms of the single-oscillator Wemple and DiDomenico model. It was found that, the mechanism of the optical absorption follows the rule of the allowed non-direct transition. The optical band gab, Eg, and the oscillator energy, Eo, decrease while the dispersion energy, Ed, increases by increasing Te content. The relationship between the obtained results and the chemical compositions of the Ge10Se90xTex thin films were discussed in terms of the chemical bond approach, the excess of Se–Se homopolar bonds and the cohesive energy (CE). 
ISSN : 05-042 
Journal Name : Journal of Non-Crystalline Solids 
Volume : 355 
Issue Number : 355 
Publishing Year : 1430 AH
2009 AD 
Article Type : Article 
Added Date : Wednesday, December 29, 2010 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
كمال عبدالنبي عليAli, Kmal AbdualnabiResearcherDoctorate 

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