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Asian Journal of Applied Sciences

Year: 2014  |  Volume: 7  |  Issue: 7  |  Page No.: 607 - 620

Synthesis and Characterization of Zn1-xCdxS Thin Films Prepared by the Spray Pyrolysis Technique

M. Kamruzzaman, Kamal Uddin Azad and Jiban Podder

Abstract

The Zn1-xCdxS (0≤×≤1) thin films have been prepared using a low cost and simple spray pyrolysis technique onto preheated glass substrates at temperature 523 K. The surface morphology, structural, optical and electrical properties of the as-deposited and annealed Zn0.20Cd0.80S films were studied by optical microscopy, Energy Dispersive X-ray (EDX), X-Ray Diffraction (XRD), UV-visible spectroscopy and Vander Pauw method, respectively. The films are shown inhomogeneous surfaces, less defined grain boundaries. The elemental analysis (EDX) revealed that the deposited films are of Zn, Cd and S compositions. X-ray diffraction patterns indicated that the as-deposited films are amorphous in nature and the annealed film is found to be crystalline structure. The average grain size of the annealed film is found to be 8-47 nm and its value increases with the increase of annealing temperature. Various optical constants viz., optical band gap, extinction coefficient, refractive index and dielectric constant have been studied. The direct optical band gap energy of the as-deposited and annealed films is varied from 3.64-2.40 eV and 2.62-2.1 eV, respectively. The dc electrical conductivity increases with the increase of temperature and also with Cd doping.

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