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Faculty of Science and Arts - Khulais
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 Type
Dr Grade
Email
كمال عبدالنبي علي
Ali, Kmal Abdualnabi
Researcher
Doctorate
Files
File Name
Type
Description
28375.pdf
pdf
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