Authors : J.A. Amusan
Abstract: Thin films of Lead Sulphide have been grown by a chemical bath deposition method, using tri-ethanol amine as complexing agent. The films were deposited on both surfaces of the glass substrates at various deposition times of 3-5 h. Some samples were kept as prepared while some were annealed at different temperatures of 100, 150 and 200°C in an electric oven. Visible/Ultra-Violet Spectrophotometer, model 6405 was utilized to measure the absorbance of each sample at various wavelengths. The effect of annealed temperatures on absorptivity of chemically deposited Lead Sulphide thin film is then studied. It is observed that high values of absorptivity are obtained from annealed samples when compared with the as prepared samples. And also, the critical annealed temperature at which optimum absorptivity occurs shifted forward in trend from samples annealed at 100°C to samples annealed at 150 and then samples annealed at 200°C as deposition time increases from 3-5 h, respectively i.e., increasing the deposition time increases the critical annealed temperature at which maximum absorptivity occurs for chemically deposited Lead Sulphide thin film. These could be attributed to the modified grain boundaries and increase in grain size of Lead sulphide crystal after annealing. Hence, the study reveals that the annealed temperature has effect on the rate of absorptivity of lead Sulphide thin film and consequently influence the electrical and optical characterizations of chemically deposited Lead Sulphide.
J.A. Amusan , 2008. Effect of Annealed Temperature on Absorptivity of Chemically Deposited Lead Sulphide Thin Film. Research Journal of Applied Sciences, 3: 1-4.