Abstract
Glassy substrates TeSeSn thin films were thermally evaporated onto chemically cleaned glass. The as-deposited (as-prepared) and annealed thin films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and optical transmission. The optical absorption of the as-prepared and annealed TeSeSn thin films is studied in the wavelength range of 300 nm - 900 nm. The direct optical energy gap (Eg) increases from 1.989 to 2.143 eV with increasing the thickness of the as-prepared films from 100 to 200 nm. The annealed TeSeSn films showed a decrease in the optical energy gap with increasing the annealing temperature. The effect of heat treatment on the lattice dielectric constant (eL) and carrier concentration (N) are also studied.
Highlights
Chalcogenide glasses are used as photographic materials and have gained much importance recently
We report the study of the dependence of the optical properties of the TeSeSn thin films on annealing temperature
The microstructure obtained for the as-prepared TeSeSn composition is shown in Figure 1(a), it is clear that the crystalline phase is embedded in the amorphous matrix
Summary
Chalcogenide glasses are used as photographic materials and have gained much importance recently. (2015) Investigation of the Effect of Film Thickness and Heat Treatment on the Optical Properties of TeSeSn Thin Films. The recording is carried out by making use of changes in the optical properties associated with improve of crystalline phase of these films resulting from annealing temperature. TeSeSn thin films have been prepared by various techniques such as thermal evaporation under vacuum [6], radio frequency sputtering [8] and pulsed laser evaporation [9]. The structural, electrical and optical properties of thin films are very sensitive to deposition conditions and post-deposition heat treatments [10]. The present work deals with some experimental observation on the effect of heat treatment on structure and optical properties of TeSeSn films. We report the study of the dependence of the optical properties of the TeSeSn thin films on annealing temperature
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