Characteristics of photoconductivity in thallium monosulfide single crystals

摘要

This work elucidates the photoconductivity (PC) of thallium monosulfide single crystals. Results are obtained in the 77–300 K temperature range, 1500–4500 V lx excitation intensity, 6–18 V applied voltage, and in the 640–1500 nm wavelength range. Both the ac-photoconductivity (ac-PC) and the spectral distribution of the photocurrent are studied in different values of light intensity, applied voltage and temperature. Dependencies of carrier lifetime on light intensity, applied voltage and temperature are also investigated as a result of the ac-PC measurements. The temperature dependence of the energy gap width was described by studying the dc-photoconductivity (dc-PC).