مشخصات پژوهش

صفحه نخست /Effect of substrate and ...
عنوان
Effect of substrate and post-deposition annealing on nanostructure and optical properties of CdTe thin films
نوع پژوهش مقاله چاپ‌شده
کلیدواژه‌ها
thermal evaporation, cadmium telluride, crystalline plane, amorphous, optical band gap
چکیده
Abstract Thermal evaporation is one of the promising methods for depositing CdTe thin films, which can obtain the thin films with the small thickness. In this work, CdTe nanoparticles have deposited on SiO2 substrates such as quartz (crystal) and glass (amorphous) at a temperature (Ts) of 150 °Cunder a vacuum pressure of 2×10−5 mbar. The thickness of CdTe thin films prepared under vacuum pressure is 100 nm. X-ray diffraction analysis (XRD) results showed the formation of CdTe cubic phase with a strong preferential orientation of (111) crystalline plane on both substrates. The grain size (D) in this orientation obtained about 7.41 and 5.48 nmfor quartz and glass respectively. Ultravioletvisible spectroscopy (UV–vis) measurements indicated the optical band gap about 1.5 and 1.52 eV for CdTe thin films deposited on quartz and glass respectively. Furthermore, to show the effect of annealing temperature on structure and optical properties of CdTe thin films on quartz and glass substrates, the thin films have been annealed at temperatures 50 and 70 °Cfor one hour. The results of this work indicate that the structure’s parameters and optical properties of CdTe thin films change due to increase in annealing temperature.
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