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Composition-tuned band gap energy and refractive index in GaSxSe1-x layered mixed crystals
Date
2017-04-01
Author
IŞIK, MEHMET
Hasanlı, Nızamı
Metadata
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Transmission and reflection measurements on GaSxSe1-x mixed crystals (0 <= x <= 1) were carried out in the 400-1000 nm spectral range. Band gap energies of the studied crystals were obtained using the derivative spectra of transmittance and reflectance. The compositional dependence of band gap energy revealed that as sulfur (selenium) composition is increased (decreased) in the mixed crystals, band gap energy increases quadratically from 1.99 eV (GaSe) to 2.55 eV (GaS). Spectral dependencies of refractive indices of the mixed crystals were plotted using the reflectance spectra. It was observed that refractive index decreases nearly in a linear behavior with increasing band gap energy for GaSxSe1-x mixed crystals. Moreover, the composition ratio of the mixed crystals was obtained from the energy dispersive spectroscopy measurements. The atomic compositions of the studied crystals are well-matched with composition x increasing from 0 to 1 by intervals of 0.25.
Subject Keywords
General Materials Science
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/36376
Journal
MATERIALS CHEMISTRY AND PHYSICS
DOI
https://doi.org/10.1016/j.matchemphys.2016.12.059
Collections
Department of Physics, Article
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M. IŞIK and N. Hasanlı, “Composition-tuned band gap energy and refractive index in GaSxSe1-x layered mixed crystals,”
MATERIALS CHEMISTRY AND PHYSICS
, pp. 74–78, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36376.
