Analysis of photoelectrical properties and current transient behaviour in TIBr

Vaidotas Kažukauskas; Andrius Jurgilaitis; Juozas-Vidmantis Vaitkus

doi:10.1117/12.726367

25 January 2007 Analysis of photoelectrical properties and current transient behaviour in TlBr

Vaidotas Kažukauskas, Andrius Jurgilaitis, Juozas-Vidmantis Vaitkus

Proceedings Volume 6596, Advanced Optical Materials, Technologies, and Devices; 65960C (2007) https://doi.org/10.1117/12.726367
Event: Advanced Optical Materials, Technologies, and Devices, 2006, Vilnius, Lithuania

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.

Citation Download Citation

Vaidotas Kažukauskas, Andrius Jurgilaitis, and Juozas-Vidmantis Vaitkus "Analysis of photoelectrical properties and current transient behaviour in TlBr", Proc. SPIE 6596, Advanced Optical Materials, Technologies, and Devices, 65960C (25 January 2007); https://doi.org/10.1117/12.726367

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