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Optoelectronic and electrical properties of TlGaS 2 single crystal
Author(s) -
Qasrawi A. F.,
Gasanly N. M.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200521190
Subject(s) - photocurrent , electrical resistivity and conductivity , materials science , hall effect , dielectric , temperature coefficient , refractive index , band gap , analytical chemistry (journal) , atmospheric temperature range , photoconductivity , transmittance , dispersion (optics) , optoelectronics , condensed matter physics , optics , chemistry , physics , chromatography , quantum mechanics , meteorology , composite material
The optoelectronic and electrical properties of TlGaS 2 single crystals have been investigated by means of room temperature transmittance and reflectance spectral analysis, Hall coefficient, dark electrical resistivity and photocurrent measurements in the temperature range of 200–350 K. The optical data have revealed an indirect and direct allowed transition band gaps of 2.45 and 2.51 eV, an oscillator and dispersion energy of 5.04 and 26.45 eV, respectively, a static dielectric constant of 6.25 and static refractive index of 2.50. The dark Hall coefficient measurements have shown that the crystals exhibit a conductivity type conversion from p‐type to n‐type at a critical temperature of 315 K. Deep donor and acceptor energy levels of 0.37/0.36 eV and 0.66 eV has been calculated from the temperature dependence of Hall coefficient and resistivity, and photocurrent measurements, respectively. The photocurrent decreases with decreasing temperature. The analysis of the photocurrent data have revealed that, the recombination mechanism is linear and supralinear above and below 290 K, respectively. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)