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Effect of Deposition Time on the Optical Properties of Cadmium Sulphide Thin Films |
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PP: 63-67 |
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Author(s) |
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P. A. Nwofe,
P. E. Agbo,
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Abstract |
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| In this study, we report on the effect of deposition time on the optical properties of SILAR (successive ionic layer and reaction) grown cadmium sulphide thin films. The films were characterised using a UV spectrophotometer to investigate the absorbance, transmittance, and reflectance versus wavelength measurements, to enable the determination of some important optical constants. The results show that deposition time had a strong influence on the properties of the films. The optical constants such as the energy bandgap, refractive index, extinction coefficient and the dielectric constants were found to vary with the deposition time. In particular, the energy bandgap was found to increase with an increase in the deposition time. The refractive index was in the range 1.2 to 1.8 while the extinction coefficient varied between 0.010 to 0.038. The values of the refractive index and extinction coefficient were slightly higher at the lower deposition time. |
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