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Proceedings Paper

Analysis of photoelectrical properties and current transient behaviour in TIBr
Author(s): Vaidotas Kažukauskas; Andrius Jurgilaitis; Juozas-Vidmantis Vaitkus
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Paper Abstract

We had investigated photoelectrical and current transient properties of TlBr in the temperature region from -20 C up to +20 C, in which the effect of ionic conductivity changes significantly. The evaluated thermal activation energy value of conductivity of about 0.78 eV could stand for several mechanisms, e.g., electronic and ionic conductivity. From the spectral dependencies of photocurrent several defect-related maxima in the region between 1 and 2.5 eV were identified, being dependent on sample prehistory. Maximum at about 1.2 eV had appeared if the spectra were scanned from the high to the low quantum energies. Meanwhile the height of the maximum at about 2.1-2.2 eV used to decrease if the sample was kept biased for several hours. The transient photocurrent kinetics had demonstrated a complex behaviour that could be explained either by the combined trapping and/or recombination of light-generated carriers to the defect centres associated with potential inhomogeneities, followed by the growing ionic conduction or by a diffusion-related scattering variation in time. The evaluated thermal activation energy of the time constants of both processes was found to be 0.24 - 0.27 eV. The obtained results indicate that ionic conductivity can take place also at -20 C, though its influence is less because of the thermally activated character.

Paper Details

Date Published: 25 January 2007
PDF: 6 pages
Proc. SPIE 6596, Advanced Optical Materials, Technologies, and Devices, 65960C (25 January 2007);
Show Author Affiliations
Vaidotas Kažukauskas, Vilnius Univ. (Lithuania)
Andrius Jurgilaitis, Vilnius Univ. (Lithuania)
Juozas-Vidmantis Vaitkus, Vilnius Univ. (Lithuania)

Published in SPIE Proceedings Vol. 6596:
Advanced Optical Materials, Technologies, and Devices
Steponas Ašmontas; Jonas Gradauskas, Editor(s)

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