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