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Research Journal of Applied Sciences
Year: 2007  |  Volume: 2  |  Issue: 9  |  Page No.: 931 - 934

Deposition Time Dependence on Absorptivity of Chemically Deposited Lead Lead Sulphide Thin Film

J.A. Amusan, G.R. Fajinmi and Y.K. Sanusi    

Abstract: Lead Sulphide (PbS) thin films were deposited on glass substrates using chemical bath deposition technique. The prepared PbS samples were grouped into two: The `as-grown`` and the ``annealed`` samples. We deposited our PbS samples, both as-grown and annealed, at various deposition time of 3, 4 and 5 (i.e 3, 4, 5 h for as-grown, 3, 4, 5 h samples annealed at 100C, 3, 4, 5 h samples annealed at 150C and 3, 4, 5 h samples annealed at 200C. Absorbance of each sample was measured and recorded at various wavelengths using Visible/Ultra-violet Spectro-photometer model 6405. The result shows non-linear relationship between the deposition time and absorbance of chemically deposited PbS thin film. Absorptivity increases in the initial process of growth with deposition time but beyond a specific time, the absorbance decreases as deposition time increases. The optimum absorptivity of the PbS samples occurs at a specific deposition time after which the absorptivity decreases as deposition time increases. This optimum absorptivity is obtained between 220 and 250 min deposition time after which the absorptivity decreases with further increase in deposition time for all samples under investigation. Thus, the optical and electrical properties of PbS thin film are deposition time dependent.

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