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Title of Journal: Indian J Phys

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Abbravation: Indian Journal of Physics

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Springer India

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DOI

10.1016/0165-0270(89)90078-2

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0974-9845

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Laser induced Te diffusion in amorphous AsSubscri

Authors: Mukta Behera Rozalin Panda Ramakanta Naik
Publish Date: 2017/01/18
Volume: 91, Issue: 5, Pages: 555-562
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Abstract

In the present report we have demonstrated the combine effect of deposition and photo diffusion of Te into As50Se50 chalcogenide thin films The influence of Te deposition onto As50Se50 layer has modified the optical parameters The thermally evaporated Te/As50Se50 bilayer film is irradiated with near bandgap laser light The optical and structural property of Te/As50Se50 bilayer film under the influence of laser irradiation has been investigated by Xray photo electron spectroscopy and Fourier transform infrared spectroscopy The As3d Se3d and Te4d core level peaks of the photo diffused film show significant changes in shape and position in comparisons with those obtained for non irradiated films The extensive analysis by deconvoluting the spectra shows the Te diffusion into As50Se50 matrix by forming Te–As–Se layer The optical band gap of the diffused region is found to be decreased with the increase of density of states in the band edge The change in transmissivity and absorption coefficient modified the optical constants which is discussed in the light of the present resultThe authors thank Department of Science and Technology DST Govt of India for DSTINSPIRE Research grant and using the National Facility for Optical Spectrometry at Department of Physics and Surface Science facility Indian Institute of Science IISc for XPS measurement

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