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Effect of substrate temperature on the structural properties of spray deposited CdTe thin films

C.H.Bhosale, D.M.Sapkal, V.M.Nikale, S.S.Shinde

The Cadmium Telluride (CdTe) thin films have been deposited onto the glass substrates using spray pyrolysis technique. The various preparative parameters such as substrate temperature, concentration, quantity and pH of solution have been optimized using photoelectrochemical (PEC) technique. Further, the films have been characterized using X-ray diffraction (XRD), optical absorption, Scanning electron microscopy (SEM), and Energy dispersive analysis by X-rays (EDAX) techniques. The PEC characterization shows that both short circuit current (Isc) and open circuit voltage (Voc) are at their optimumvalues for the optimized substrate temperature of 250°C and a solution concentration of 0.01 M. The XRD pattern shows that the films are polycrystalline with cubic structure. The optical absorption study reveals that CdTe exhibits a direct optical transition with band gap energy Eg to be 1.5 eV. The filmat optimized temperature haswell-formed grains as evidenced from SEM. The EDAX analysis reveals that material formed is almost stoichiometric at optimized preparative parameters.