Structural and Optical Properties of nanostructured Bismuth Sulfide-Lead Sulfide Thin Films of Variable Compositions

Conference Paper

Elkader, Omar H. Abd . 2011

• اسم المؤتمر: International Conference on Nano and Materials Science ICNMS 2011
• عنوان المؤتمر: Dalian China
• تاريخ المؤتمر: السبت, آب (اغسطس) 27, 2011
• المنظمة الراعية: Dalian University, China

مستخلص المنشور

Nanostructures thin films of six different compositions (Bi2S3)1-x (PbS)x have been prepared by chemical bath
deposition (CBD)from solution onto glass substrates. The nominal compositions in the range [0.1 ≤ x ≤ 0.85] were
confirmed by Atomic Absorption Spectroscopy (AAS). X- Ray powder diffraction indicated different crystal
structures for thin films of different compositions, while a large amorphous component was present. X-ray
diffraction for as deposited and annealed samples showed that the crystallinity increases dramatically upon heat
treatment of the thin films. The optical transmission spectrum of thin films deposited on glass substrates has been
measured at room temperature [300 K], over the range from 300 nm to 2500 nm. The optical bandgaps [Eg]
decrease with the addition of PbS. Annealing generally lowers the bandgaps of all films. Differential Scanning
Calorimetery (DSC) showed that the major changes in the thin films started to proceed at temperatures between 570
and 750 K, depending on x.