Photoconductivity studies were carried out on single crystals prepared from melt. We studied the effect of light intensity, applied voltage, and ambient temperature on both the spectral distribution of photoconductivity and the lifetime of carriers. We found that the mode of the spectral characteristics was practically independent of the light intensity and applied bias voltage, but shifted to higher values of the photocurrent with increase light intensity and applied bias voltage. It was also noticed that the photocurrent decreases with the increase of temperature up to 200 K and increases above this temperature. The () behaviour was in agreement with behaviour described by the Varshni equation; its constant was found to be , and the temperature coefficient . It was shown that the lifetime decreases with an increase of light intensity and applied voltage, increases with a decrease in temperature and, below 200 K, the lifetime decreases with an increase in temperature.
Photoelectric properties were measured on a single crystal prepared by a special design based on the Bridgman technique. We report the results of an investigation of the dependence of DC and AC photoconductivity on light intensity, applied voltage and ambient temperature. The forbidden energy gap at room temperature and the thermal coefficient of the energy gap were calculated also and found to be 1.793 eV and respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.