Effects of Pb-Doping on Phase Structural and Optical Properties of CdZnS Nano-Powders |
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| Authors: | Mahdi Ghasemifard Somayeh Tohidi Roholah Karimzadeh |
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| Affiliation: | 1.Nano Technology Lab,Esfarayen University,Esfarayen+98-585,Iran;2.Department of physics,Shahid Beheshti University,Tehran+98-21,Iran |
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| Abstract: | Cadmium zinc lead sulfide[Cd0.8(Zn1-x,Pbx)0.2S] nano-powders were prepared by an improved coprecipitation method. The effect of Pb2+ concentration at 500℃ on the phase and crystalline structure of the Cd0.8(Zn1-x,Pbx)0.2S powders were investigated by X-ray diffraction (XRD). According to the transmission electron microscopy (TEM) images, the particles size are in the range of 58 nm to 72 nm. In addition, optical band gap energy and optical constants of nano-powders were determined using the ultraviolet (UV) spectrum, Fournier transform infrared spectroscopy (FTIR), and Kramers-Kronig analysis, respectively. We calculate the refractive index n, extinction coefficient k, and dielectric function as a function of the wavenumber. The experiment results demonstrate that the amount of Pb+2 has been playing an increasingly important role on optical properties of CZPS nanocrystals. |
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| Keywords: | Coprecipitation Kramers-Kronig analysis optical constants X-ray diffraction |
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