Enhancement of nonlinear optical parameters upon phase transition in new quaternary Ge20Ag10Te10Se60 films by annealing at various temperatures for optoelectronic applications

Das, S and Senapati, S and Alagarasan, D and Varadharajaperumal, S and Ganesan, R and Naik, R (2022) Enhancement of nonlinear optical parameters upon phase transition in new quaternary Ge20Ag10Te10Se60 films by annealing at various temperatures for optoelectronic applications. In: Journal of Alloys and Compounds, 927 .

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Abstract

The current work investigates the influence of annealing at different temperatures on new quaternary Ge20Ag10Te10Se60 films. The phase transition from amorphous to crystalline with annealing is being studied from XRD and supported by TEM analysis. The Raman study shows the change in microstructural changes in terms of vibrational modes. The particle size increased with annealing along with the growth of Ag2Te, AgTe3, GeSe2, Ag2Se phases. The compositional and morphological study is carried out by EDX analysis and FESEM study. The linear optical properties of the material have been calculated from the UV-Visible spectra. The decrease in the optical bandgap of the films upon annealing is due to phase transition and increase in the surface dangling bonds. The static refractive index and the nonlinear refractive index are found to be increased with annealing. The significant increase in 3rd order nonlinear susceptibility with annealing is useful for nonlinear optical applications. The high-frequency dielectric constant increased upon annealing. The structural and optical changes are explained on the basis of amorphous to crystalline transformation and density of defect states. Increased value of nonlinear refractive index with decreased optical electronegativity with annealing is useful for nonlinear and optoelectronic applications.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	3rd order nonlinear susceptibility; Annealing; Crystallinity; Ge20Ag10Te10Se60 films; Nonlinear refractive index; Optical properties
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	05 Oct 2022 04:51
Last Modified:	05 Oct 2022 04:51
URI:	https://eprints.iisc.ac.in/id/eprint/77008

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