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Optical Properties of Zinc Sulphide Thin Films Fabricated using Chemical Bath Deposition Technique

Author Affiliations

  • 1Department of Physics and Industrial Physics, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria

Res. J. Recent Sci., Volume 5, Issue (4), Pages 12-18, April,2 (2016)

Abstract

Thin films of Zinc Sulphide were deposited on glass substrate using Chemical Bath Deposition Technique. The optical properties of the deposited films were determined using M501 Single Beam Scanning UV/VIS Spectrophotometer at normal incidence of light in the wavelength range of 380nm-700nm. The results show that films exhibited poor absorbance value of 0.001-0.027 and reflectance value of 0.001-0.033 within this region of electromagnetic spectrum. In this same region, the transmittance of the incident radiation was found to be very high with value range of 0.939-0.998. Other calculated properties such as absorption coefficient and optical conductivity were found to be high with respective values of 0.154 x104m-1 – 7.105 x104m-1 and 0.0395 x1012 S-1 – 2.45 x1012 S-1. The refractive index of the films was observed to have a value range of 1.10-1.45 with extinction coefficient recording a value range of 0.0000796 – 0.00016. The computed values of real part dielectric function were found to be within the range 1.155-2.092 with imaginary part dielectric function having a value range of 0.000171 -0.00621. The films were found to exhibit band gap energy of 3.18eV -3.20eV. All these desirable properties made thin films of Zinc Sulphide to be a good candidate for fabrication of opto-electronics and photovoltaic devices.

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