Document Details

Document Type : Article In Journal 
Document Title :
Structural, optical and electrical properties of cadmium-doped lead chalcogenide (PbSe) thin films
Structural, optical and electrical properties of cadmium-doped lead chalcogenide (PbSe) thin films
 
Subject : Physics 
Document Language : English 
Abstract : (PbSe)100-xCdx thin films of thickness 3000 with variable concentrations of Cd (x=5, 10, 15 and 20) were prepared by thermal evaporation on glass substrates at room temperature at a base pressure of 10-6 Torr. The structural, optical and electrical properties of these films were studied. X-ray diffraction patterns were used to determine the crystal structure of the films. Films were of polycrystalline texture over the whole range of study. Optical constants of all films were determined by absorbance and reflection measurements in a wavelength range 4001200 nm. Analysis of the optical absorption data showed that the rule of direct transitions predominates. The values of the absorption coefficient (α), extinction coefficient (k) and imaginary part of the dielectric constant were found to increase with increasing Cd content in lead chalcogenides while the refractive index (n) and real part of dielectric constant were increased with increasing Cd concentration up to 15% and then they decreased with 20% of Cd content in PbSe. These results were interpreted in terms of the change in concentration of localized states due to the shift in Fermi level. The dc conductivities and activation energies of the films were measured in the temperature range 298398 K. It was observed that the dc conductivity increases at all temperatures with the increase of Cd content in lead chalcogenide system. The experimental data suggests that the conduction is due to the thermally assisted tunneling of the carriers in the localized states near the band edges. The activation energy and optical band gap were found to decrease with increasing Cd concentration in lead chalcogenide. 
ISSN : 0921-4526 
Journal Name : Physica B: Condensed Matter 
Volume : 405 
Issue Number : 16 
Publishing Year : 1431 AH
2010 AD 
Article Type : Article 
Added Date : Sunday, October 16, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
شمشاد أحمد خانKhan, Shamshad AhmedResearcherDoctorateshamshad_phys@yahoo.com
ذيشان حسين خانKhan, Zishan HResearcherDoctoratezishan_hk@yahoo.co.in
أحمد عبد العظيم السباعيEl-Sebaii, A AResearcherDoctorateaasebaii@yahoo.com
فهد مسعود المرزوقيAl-Marzouki, Fahad MResearcherDoctoratefmarzouki1@kau.edu.sa
أحمد عبدالله الغامديAl-Ghamdi, A AResearcherDoctorateAGAMDI@kau.edu.sa

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