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Optical properties change in laser-induced Te/As2Se3 chalcogenide thin films

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Abstract

In the present work, we report the change in optical parameters due to the deposition and photo-induced diffusion of Te layer into the chalcogenide As2Se3 film. The photo-diffusion creates a solid solution of As–Se–Te which has potential application in optical devices. The Te/As2Se3 bilayer films prepared by thermal evaporation technique were studied by various experimental techniques. The photo-diffusion of Te into As2Se3 matrix was done by 532-nm laser irradiation. The structure of the As2Se3, as-prepared and irradiated Te/As2Se3 films was studied by X-ray diffraction which were amorphous in nature. The presence of all the elements was checked by energy-dispersive X-ray analysis, and the optical transmission spectra were recorded by Fourier transform infrared spectrometer. The optical band gap is reduced by the deposition and diffusion of Te into As2Se3 film which is due to the increase in density of defect states in the gap region. The transmission is decreased, whereas the absorption efficiency is increased with the increase in disorderness. The X-ray photoelectron spectroscopy carried out on these films gives information about the bonding change due to the photo-diffusion process. Therefore, this is an important result which will open up new directions for the application of this material in semiconducting devices.

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Acknowledgments

The authors thank Department of Science and Technology (DST), Govt of India for DST-INSPIRE 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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  1. Department of Physics, Utkal University, Bhubaneswar, 751004, India

    Mukta Behera & Ramakanta Naik

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  1. Mukta Behera
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Correspondence to Ramakanta Naik.

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Behera, M., Naik, R. Optical properties change in laser-induced Te/As2Se3 chalcogenide thin films. Appl. Phys. A 122, 913 (2016). https://doi.org/10.1007/s00339-016-0451-7

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