PICTS-spectroscopy of synthetic HPHT diamond in the temperature range 300-550 K
The electrically active defects in synthetic single crystals of HPHT diamond have been investigated using photo-induced current transient spectroscopy (PICTS). It has been found that kinetics of photocurrent is of complex nature in the temperature range 400-550 K. Detailed analysis of photocurrent relaxation on the basis of approximation by the sum of two exponential components has been performed. It is shown that their contributions cannot be interpreted as the result of thermal emission from two independent local levels. These defects are suggested to be responsible for the long photocurrent stabilization in detectors made of HPHT diamonds.