Influence of Complexing Agent (TEA) On the Optical Properties of Bismuth Sulphide Thin Films Deposited By Chemical Bath Deposition Technique

Thin films of Bismuth Sulphide were successfully deposited on glass substrate using chemical bath deposition technique at different concentrations of complexing agent (TEA) and at room temperature (300K). The deposited films were optically characterized using M501 Single Beam Scanning UV/VIS Spectrophotometer. The results show that the deposited films were generally affected by the concentration of complexing agent (TEA) in the reaction bath. The film deposited at 10ml concentration was found to possess highest values in the following optical properties ; absorbance (16.7%), reflectance (15.39%), refractive index (2.29), optical conductivity (2.52 x 1013S-1), extinction coefficient (0.013528), real part dielectric function (5.249506) and imaginary part dielectric function (0.061992). The film deposited at 2ml concentration of TEA was found to have highest transmittance value of 90.36% at wavelength value of 300nm. And the film deposited at 6ml TEA concentration exhibited highest band gap energy value of 2.60eV.