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Crystal data and indirect optical transitions in Tl2InGaSe4 crystals
Date
2008-06-03
Author
QASRAWI, ATEF FAYEZ HASAN
Hasanlı, Nızamı
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The room temperature crystal data and the optical properties of the Bridgman method grown Tl2InGaSe4 crystals are reported and discussed. The X-ray diffraction technique has revealed that Tl2InGaSe4 is a single phase crystal of monoclinic structure. The unit cell lattice parameters, which were recalculated from the X-ray data, are found to be a = 0.77244 nm, b = 0.64945 nm, c = 0.92205 nm and beta = 95.03 degrees. The temperature dependence of the optical band gap of Tl2InGaSe4 single crystal in the temperature region of 290-500 K has also been investigated. The absorption coefficient was calculated from the transmittance and reflectance data in the incident photon energy range of 1.60-2.10 eV. The absorption edge is observed to shift toward lower energy values as temperature increases. The fundamental absorption edge corresponds to indirect allowed transition energy gap of 1.86 eV that exhibited a temperature coefficient gamma = -3.53 x 10(-4) eV/K.
Subject Keywords
Mechanical Engineering
,
General Materials Science
,
Mechanics of Materials
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/39180
Journal
MATERIALS RESEARCH BULLETIN
DOI
https://doi.org/10.1016/j.materresbull.2007.06.025
Collections
Department of Physics, Article