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Evaluation of various optical parameters of (Ge20Se80)90Sb10 thin films by Jasmeen Kang; R.K. Kotnala; S.K. Tripathi is a Engineering article available to read on EtoBox.

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Conventional melt-quenching method is utilized in the preparation of Se-rich (Ge 20 Se 80 ) 90 Sb 10 bulk material. Thin films of (Ge 20 Se 80 ) 90 Sb 10 glassy system are prepared under 2 Â 10 À5 mbar pressure, with the help of vacuum evaporation technique. UV-VIS spectroscopy has been performed in the wavelength range 400-3300 nm at room temperature (298 K). Various optical parameters -refractive index (n), absorption coefficient (a), extinction coefficient (k), Urbach energy, optical band gap, dielectric constants, moments of spectra etc. have been evaluated using Swanepoel's method. The absorption coefficient is approximated to have values of the order 10 4 À 10 5 cm À1 . A direct bandgap of 2.65 eV is evaluated for the synthesized material. The analysis of the optical properties proves (Ge 20 Se 80 ) 90 Sb 10 glassy system to be a promising material for the optoelectronic utilizations.

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Author

Jasmeen Kang; R.K. Kotnala; S.K. Tripathi

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)