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Influence of photonic excitations on the electrical parameters of TlInS2 crystals
Date
2010-04-01
Author
QASRAWI, ATEF FAYEZ HASAN
Hasanlı, Nızamı
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The photo-excitation effect on the current transport mechanism in TlInS2 crystals has been studied by means of dark and illuminated conductivity measurements. The temperature-dependent electrical conductivity analysis in the temperature region of 110-340 K revealed the domination of the thermionic emission and the thermally assisted variable range hopping (VRH) of charge carriers above and below 160 K, respectively. Above 160 K, the conductivity activation energies in the dark are found to be 0.28 and 0.15 eV in the temperature regions of 340-240 K and 230-160 K, respectively. In the temperature region of 110-150 K, the dark variable range hopping analysis revealed a density of localized states of 1.99x 10(22) cm(-3)eV(-1), an average hopping distance of 0.53 nm and an average hopping energy of 79.65 meV. When the sample was photo-excited, the values of the conductivity activation energies, the density of localized states near the Fermi level and the average hopping energy were observed to decrease sharply with increasing illumination intensity. On the other hand, the average hopping distance increased with rising illumination intensity. Such behaviours were attributed to the Fermi level shift and/or trap density reduction by electron-hole recombination. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Subject Keywords
General Materials Science
,
General Chemistry
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/48867
Journal
CRYSTAL RESEARCH AND TECHNOLOGY
DOI
https://doi.org/10.1002/crat.200900625
Collections
Department of Physics, Article
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A. F. H. QASRAWI and N. Hasanlı, “Influence of photonic excitations on the electrical parameters of TlInS2 crystals,”
CRYSTAL RESEARCH AND TECHNOLOGY
, pp. 433–438, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48867.