Abstract
The characteristics of room temperature photoluminescence of cadmium sulfide films have been studied as the crystalline structure is changed by postdeposition thermal treatments in Ar or sulfur rich Ar ambient from cubic to hexagonal phase. The films, deposited by the chemical bath technique on a glass substrate, grow with a cubic polycrystalline structure. The behavior of the luminescence spectra is correlated with X-ray diffraction and optical absorption results. The luminescence emission from these samples is the well known green emission of CdS at ∼ 550nm. A shift in the location of this peak is observed to be associated with changes in the energy band gap and with crystalline structure transition from cubic to hexagonal. It has also been found that the structural transition occurs at lower temperature and more abruptly when the thermal treatment is given in an ambient without sulfur than when sulfur is added to the annealing ambient.
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