OPTICAL AND STRUCTURAL PROPERTIES OF CADMIUM TELLURIDE THIN FILMS BY CHEMICAL BATH DEPOSITION METHOD

Crystalline cadmium telluride thin films has been deposited using appropriate precursor solution containing
cadmium sulphate, triethanolamine, sodium hydroxide, Ammonia and Sodium telluro sulphate in aqueous
alkaline medium at 62 ±20C. The films were characterized by X-ray diffraction (XRD), scanning electron
microscopy, Atomic absorption spectroscopy (AAS), optical absorption spectra and electrical measurements. The
colour of formed film was found to be light gray. The crystalline phase of the deposited sample was cubic type.
Optical absorption spectra showed the presence of direct transition with band gap energy 1.78 eV. The electrical
resistivity of CdTe thin film was found to the order of 10-6 (Ώ.cm)-1. Thermoelectric power (TEP) measurement
showed n-type electrical conduction.