Investigations on structural phase transition in hot wall deposited CdSexTe1−x thin films

CdSexTe1−x (0 ≤ x ≤ 1) compound has been prepared by direct reaction of elemental cadmium, selenium and tellurium and thin films of CdSexTe1−x have been deposited onto well-cleaned glass substrates by hot wall deposition technique. CdSexTe1−x thin films have been deposited using a hot wall arrangement consisting of a quartz tube of 6.5 cm length and 1 cm diameter. The composition of the deposited films has been identified using energy dispersive analysis of X-rays. X-ray diffraction studies revealed that the prepared CdSexTe1−x bulk and deposited thin films are polycrystalline in nature with cubic zinc blende or hexagonal structure or both depending on the composition. CdSexTe1−x was found to exhibit a structural phase transition as a function of composition. The micro-structural parameters such as grain size, dislocation density and strain have been evaluated and their thickness dependence has been analysed. Photoluminescence spectra of the deposited films have been studied.