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نوع الوثيقة : مقال في مجلة دورية 
عنوان الوثيقة :
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
 
الموضوع : فيزياء 
لغة الوثيقة : الانجليزية 
المستخلص : (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. 
ردمد : 0921-4526 
اسم الدورية : Physica B: Condensed Matter 
المجلد : 405 
العدد : 16 
سنة النشر : 1431 هـ
2010 م 
نوع المقالة : مقالة علمية 
تاريخ الاضافة على الموقع : Sunday, October 16, 2011 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
شمشاد أحمد خانKhan, Shamshad Ahmedباحثدكتوراهshamshad_phys@yahoo.com
ذيشان حسين خانKhan, Zishan Hباحثدكتوراهzishan_hk@yahoo.co.in
أحمد عبد العظيم السباعيEl-Sebaii, A Aباحثدكتوراهaasebaii@yahoo.com
فهد مسعود المرزوقيAl-Marzouki, Fahad Mباحثدكتوراهfmarzouki1@kau.edu.sa
أحمد عبدالله الغامديAl-Ghamdi, A AباحثدكتوراهAGAMDI@kau.edu.sa

الملفات

اسم الملفالنوعالوصف
 31037.pdf pdfAbstract

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