Abstract
Voltage response to light pulse was investigated in Bi-based bulk and Y-based thin film specimens immersed in liquid nitrogen. When light pulse is applied to a bulk specimen under constant current flow, voltage rise is observed. The voltage rise increases with light intensity and current. Relationship between voltage rise due to light pulse and electric field due to flux flow before light irradiation shows almost the same straight line in six specimens. In thin film specimen, voltage response is pulse like and large in comparison with bulk specimen. Time-integrated value of voltage response increases with light intensity and current; the same tendency with bulk specimen is observed. Voltage response is delayed from light pulse. Delay time decreases with light intensity. Minimum delay time of 0.02ms was obtained in thin film specimen.
