Document Details

Document Type : Article In Journal 
Document Title :
Synthesis and optical characterization of nanocrystalline CdTe thin films
Synthesis and optical characterization of nanocrystalline CdTe thin films
 
Subject : Physics 
Document Language : English 
Abstract : From several years the study of binary compounds has been intensified in order to find new materials for solar photocells. The development of thin film solar cells is an active area of research at this time. Much attention has been paid to the development of low cost, high efficiency thin film solar cells. CdTe is one of the suitable candidates for the production of thin film solar cells due to its ideal band gap, high absorption coefficient. The present work deals with thickness dependent study of CdTe thin films. Nanocrystalline CdTe bulk powder was synthesized by wet chemical route at pH≈11.2 using cadmium chloride and potassium telluride as starting materials. The product sample was characterized by transmission electron microscope, X-ray diffraction and scanning electron microscope. The structural characteristics studied by X-ray diffraction showed that the films are polycrystalline in nature. CdTe thin films with thickness 40, 60, 80 and 100 nm were prepared on glass substrates by using thermal evaporation onto glass substrate under a vacuum of 10-6 Torr. The optical constants (absorption coefficient, optical band gap, refractive index, extinction coefficient, real and imaginary part of dielectric constant) of CdTe thin films was studied as a function of photon energy in the wavelength region 4002000 nm. Analysis of the optical absorption data shows that the rule of direct transitions predominates. It has been found that the absorption coefficient, refractive index (n) and extinction coefficient (k) decreases while the values of optical band gap increase with an increase in thickness from 40 to 100 nm, which can be explained qualitatively by a thickness dependence of the grain size through decrease in grain boundary barrier height with grain size. 
ISSN : 0030-3992 
Journal Name : Optics and Laser Technology 
Volume : 42 
Issue Number : 8 
Publishing Year : 1431 AH
2010 AD 
Article Type : Article 
Added Date : Monday, October 17, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أحمد عبدالله الغامديAl-Ghamdi, A AResearcherDoctorateAGAMDI@kau.edu.sa
شمشاد أحمد خانKhan, Shamshad AhmedResearcherDoctorateshamshad_phys@yahoo.com
نجاة عباسAbbas, Nagat ResearcherDoctorate 
محمود عبدالصادقAbd El-Sadek, Mahmoud ResearcherDoctorate 

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