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Effect of laser irradiation on optical properties of Ge12Sb25Se63 amorphous chalcogenide thin films

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Abstract

The change in photo-induced optical properties in thermally evaporated Ge12Sb25Se63 chalcogenide thin film under 532-nm laser illumination has been reported in this paper. The structure and composition of the film have been examined by X-ray diffraction and energy dispersive X-ray analysis, respectively. The optical properties such as refractive index, extinction coefficient and thickness of the films have been determined from the transmission spectra based on inverse synthesis method and the optical band gap has been derived from optical absorption spectra using the Tauc plot. It has been found that the mechanism of the optical absorption is due to allowed indirect transition. The optical band gap increases by 0.05 eV causing photo-bleaching mechanism, while refractive index decreases because of reduction in structural disordering. Deconvolution of Raman and X-ray photoelectron spectra into several peaks provides different structural units, which supports the optical photo-bleaching.

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Acknowledgments

The authors thank Department of Science and Technology (DST), Govt of India, for DST-INSPIRE Research grant and 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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Authors and Affiliations

  1. Department of Physics, Utkal University, Bhubaneswar, 751004, India

    R. Naik

  2. Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    S. Jena & N. K. Sahoo

  3. Department of Physics, Indian Institute of Science, Bengaluru, 560012, India

    R. Ganesan

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  1. R. Naik
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  2. S. Jena
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  4. N. K. Sahoo
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Correspondence to R. Naik.

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Naik, R., Jena, S., Ganesan, R. et al. Effect of laser irradiation on optical properties of Ge12Sb25Se63 amorphous chalcogenide thin films. Indian J Phys 89, 1031–1040 (2015). https://doi.org/10.1007/s12648-015-0678-8

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  • DOI: https://doi.org/10.1007/s12648-015-0678-8

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