Photoluminescence properties of ZnSe1−x Te x thin films on GaAs/ITO substrates by electron beam evaporation technique

Abstract

Zinc chalcogenide which includes zinc selenide, zinc sulphide, zinc telluride and mixed crystals of these shows a great potential as an optoelectronic device material. Zinc selenotelluride is a suitable material for visible light emitting devices which are expected to cover the spectral range from yellow to blue. In our present study the composition controlled ZnSe 1-x Te x films with different Te content x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0 were deposited by electron beam (EB) evaporation technique. GaAs films were deposited by vacuum evaporation route on indium tin oxide (ITO) substrates which were used as base for depositing the ZnSe 1-x Te x film. The band-gap energy change in the entire composition range was determined at room temperature by photoluminescence (PL) spectroscopy. The peak observed at about 2.56 eV shows the effect of solid solution formation between ZnSe and ZnTe which modifies the lattice and consequently the band edge emission characteristics. The heterostructures showed three peaks in the visible region of white light spectrum. semiconducting II-VI materials, ZnSeTe, electron beam evaporation, photoluminescence Citation: Suthagar J, Suthan kissinger N J, Balasubramaniam M, et al. Photoluminescence properties of ZnSe 1-x Te x thin films on GaAs/ITO substrates by electron beam evaporation technique.

Hybrid Density Functional Theory Study on Structural and Optoelectronic Properties of ZnSe1–xTex for the Photocatalytic Applications

“…The bandgap of ZnSe can be easily tuned from 2.25 to 2.70 eV by making solid solutions from ZnSe and ZnTe. − Shaaban et al determined that the bandgap value of ZnSe 1– x Te x solid solutions is reduced from 2.59 to 2.16 eV with the increase of Te content. Accordingly, the ZnSe 1– x Te x thin films were used as the photovoltaic active materials for light harvesting, which were experimentally prepared by using various techniques like molecular beam epitaxy, electron beam evaporation, high vacuum evaporation, spray pyrolysis, and metal organic chemical vapor deposition . However, so far there is no report on the applications of ZnSe 1– x Te x solid solutions in photocatalysis like solar fuel production, neither experimentally nor theoretically.…”