International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3
255 Structural and Optical Properties of Nanostructured Bismuth Sulfide — Lead Sulfide thin Films of Variable Compositions
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- Ris (Zotero)
- Reference Manager
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  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  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.