Low-Frequency Photocurrent Oscillations in CdIn2S4 Single Crystals

Abstract

Low-frequency photocurrent oscillations in CdIn₂S₄ single crystals when a high electric field is applied at low temperature have been studied through simultaneous observations of the photocurrent and the photoluminescence. Several parameters necessary for analysis of the oscillations have been determined from additional experiments. We found that the pulse-type oscillations disappeared when light of photon energies between 1.97 and 2.54 eV was superposed. The distribution of the electric field in the sample was measured and it was found tbat the region of high electric field, the so-called domain, does not move in space but that the electric field varies periodically, leading to the current oscillation. The mechanism of the pulse-type photocurrent oscillations in CdIn₂S₄ single crystals is well-explained by the three-center model considering the thermal quenching process.