Document Details

Document Type : Article In Journal 
Document Title :
Effect of heat treatment on the optical and electrical transport propertiesof Ge15Sb10Se75 and Ge25Sb10Se65 thin films
تأثير المعالجة الحرارية على الخصائص الضوئية والكهروضوئية للغشائين الرقيقن المكونيين من جرمانيوم أنتيمون سيلينيوم
 
Subject : Heat treatment 
Document Language : English 
Abstract : The effect of heat treatment on the optical and electrical properties of Ge15Sb10Se75 and Ge25Sb10Se65 thin films in the range of annealing temperature 373–723 K has been investigated. Analysis of the optical absorption data indicates that Tauc’s relation for the allowed non-direct transition successfully describes the optical processes in these films. The optical band gap (Eg opt.) as well as the activation energy for the electrical conduction (DE) increase with the increase of annealing temperature (Ta) up to the glass transition temperature (Tg). Then a remarkable decrease in both the Eg opt. and DE values occurred with a further increase of the annealing temperature (Ta4Tg). The obtained results were explained in terms of the Mott and Davis model for amorphous materials and amorphous to crystalline structure transformations. Furthermore, the deduced value of Eg opt. for the Ge25Sb10Se65 thin film is higher than that observed for the Ge15Sb10Se75 thin film. This behavior was discussed on the basis of the chemical ordered network model (CONM) and the average value for the overall mean bond energy /ES of the amorphous system GexSb10Se90x with x ¼ 15 and 25 at%. The annealing process at Ta4Tg results in the formation of some crystalline phases GeSe, GeSe2 and Sb2Se3 as revealed in XRD patterns, which confirms our discussion of the obtained results. 
ISSN : 10-1016 
Journal Name : Journal of Physics and Chemistry of Solids 
Volume : 69 
Issue Number : 69 
Publishing Year : 1429 AH
2008 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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