Optimization of Optical Properties of Annealed Cadmium Selenide (Cdse) Thin Films Grown by Chemical Bath Deposition Technique

Two groups of cadmium selenide thin films deposited at 250C and 740C respectively on glass substrates by chemical bath deposition method were studied. A moderately stable sodium selenosulphite (Na2SeSo3) was used as a source of Se2- ions. To prevent spontaneous precipitation and ensure ion-by-ion deposition on the substrate, TEA was used as a complexing agent. The optical characterization was centered on transmittance, reflectance for the annealed and various annealing temperature of thin film. The structural nature was obtained from X-ray diffraction (XRD) analysis. The optical properties were obtained from absorption and transmittance data within the range of 200-to-1000nm. Some of the films were found to have a good transmittance and low reflectance hence suitable for window coatings for cold climates and antireflection coatings. Key Words: - Characterization, Deposition and annealing temperature and time, optical, Chemical Bath Technique, Cadmium Selenide thin Films, annealing, transmittance, reflectance, band gap