Effect of deposition time on optical, structural and photoluminescence properties of Cd_(0.6)Co_(0.4)S thin films by chemical bath deposition method

摘要

Cd_(0.6)Co_(0.4)S thin films have been deposited successfully on glass plates using chemical bath deposition method at 80° C by changing the time of deposition as a controlling parameter from 10 to 30 h. X-ray diffraction measurement shows the Co substitution of cadmium sulphide (CdS) system with hexagonal structure having the average crystalline between 1.79 and 2.13 nm. Energy dispersive X-ray spectrum reveals the presence of Co in the Cd-S lattice. The change in lattice parameters is demonstrated by the crystal size, bond length, micro-strain and the quantum confinement effect. The band gap energy is varied from 2.44 to 2.66 eV by changing the deposition times from 10 to 30 h which is useful to design a suitable window material in fabrication for solar cells. The presence of functional groups and the chemical bonding is confirmed by Fourier transform infrared spectra. The presence and the major blue shift of strong blue and red bands were demonstrated by photoluminescence spectra. The intensive emission properties of the Cd_(0.6)Co_(0.4)S thin films show a great potential for use as nano-scaled optoelectronic intensive light emitters under different deposition time.