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Crystal Research and Technology |
Cryst. Res. Technol. 39,
63 (2004) - Abstract -
Photoconductivity in Tl4S3 layered single crystals
I. M. Ashraf, H. A. Elshaikh, A. M. Badr
Physics Department, Faculty of Science (Aswan), South Valley University, Egypt
Photoconductivity measurements are carried out in this work for single crystals of Tl4S3 compound by using both pulsed excitation (a.c) and steady state (a.c) methods in order to elucidate the nature of photoconductivity (PC) in this compound. Results are reported in the temperature range from 77 to 300K, excitation intensity range from 1800 to 3300Lux, applied voltage range from 8 to 14V, and wavelength range from 840 to 1450nm. Both of the ac-photoconductivity (ac-PC) and the spectral distribution of the photocurrent are studied at different values of light intensity, applied voltage and temperature. Dependencies of carrier lifetime on light intensity, applied voltage and temperature are also investigated as results of the ac-PC measurements. By using the results of the dc-photoconductivity (dc-PC) measurements, the temperature dependence of the energy gap width is described.
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