Optical properties study in As50Se50 and As50Se40Te10 chalcogenide thin films

Amorphous As50Se50 and As50Se40Te10 thin films were prepared by thermal evaporation technique. The amorphous nature of these films were confirmed from the XRD study. The optical transmission spectra of these films were measured in the wavelength range of 400-1200 nm. The transmittance power is found...

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Bibliographic Details
Main Authors: Behera, M., Naik, Parbati, Panda, R., Naik, R.
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:Amorphous As50Se50 and As50Se40Te10 thin films were prepared by thermal evaporation technique. The amorphous nature of these films were confirmed from the XRD study. The optical transmission spectra of these films were measured in the wavelength range of 400-1200 nm. The transmittance power is found to be decreased with Te incorporation into As50Se50 while the absorption value is increased. The mechanism of the optical absorption follows the rule of allowed non-direct transition. The optical band gap value is found to be decreased while the width of localized states (urbach energy) Ee increases with Te addition. Addition of Te into As50Se50 is found to affect the refractive index and extinction coefficient. The Raman shift observed in the two films clearly supports the optical changes due to Te addition. The chemical bond approach has been applied to interpret the decrease in optical band gap.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4980444