Study of the physical properties of CdTe (۲۰۰): synthesized nanoparticles and grown thin film

In this work, cadmium telluride nanoparticles were synthesized by sonochemical method and then thin films with the thicknesses about of ۱۰۰ nm were deposited on glass substrates using thermal evaporation technique at a substrate temperature of ۲۰۰ °C and vacuum pressure of ۲×۱۰-۵ mbar. Sonochemical method is one of the best methods for synthesizing nanomaterials with very small particle sizes. After synthesis and deposition, the prepared films were subjected to x-ray diffraction, ultraviolet-visible spectroscopy and scanning electron microscopy to study the structure, optical properties and morphology of the films. XRD patterns indicated that the grown films were polycrystalline with a cubic structure on the preferred orientation (۲۰۰).The size of the synthesized nanoparticles and crystallite size of the thin film grown on glass in the preferred orientation (۲۰۰) were ۱۶ nm &۱۰.۶۵ nm, respectively. Light absorbance spectra of nanoparticle and thin film obtained by UV-Vis spectroscopy at the wavelength range ۶۰۰-۱۶۰۰ nm showed the increase of light absorption after deposition. The optical energy band gap was increased from ۱.۴۸ for nanoparticles to ۱.۵۱ for the deposited films. The SEM taken on the scale of ۵۰۰ nm from nanoparticles and thin films showed the homogeneity and uniformity of both of them

کلیدواژه ها:

Cadmium Telluride ، Sonochemical ، Thermal evaporation deposition ، Crystallite size ، Extinction coefficient