Abstract
Nanocrystalline Cd0.7 Zn0.3S:Pb thin films were deposited on glass substrates by chemical bath technique (CBD) at 80±2ºC from an aqueous bath containing cadmium chloride, zinc chloride , thioureaand doped lead chloride in the presence of ammonia solution . Structural properties of the obtained films were studied by X-ray diffraction analysis. The structural parameters such as crystallite size have been evaluated. .The absorption spectra are recorded in the wavelength range 200 - 1100 nm which show Optical spectroscopy results of the films indicated that the optical band gap value decreased from 2.95 to 2.1 eV with the increasing of Pbdoping. And finally the optical constants such as refractive index,extinction coefficient, real and imaginary dielectrics were investigated.
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