Dynamics of Photoconductivity and the Shallow Traps Parameters in the Sillenite-Structure Crystals

摘要

Frequency dependencies of the alternating part of photoconductivity in two single crystal Bil2SiO20 samples illuminated by slightly modulated light were measured. The crystals were grown in different conditions (in the presence or absence of oxygen). The nonmonotonic relaxation of photoconductivity was observed in both samples at different wavelengths of illuminating light. A system of linearized equations was used to describe the photocurrent relaxation process. It is shown that the nonmonotonic relaxation of photocurrent allow us to estimate separate contributions of different shallow trap species.