Enhaancement of Photoconduction by Detrapping in Anthracene Crystal

The photocurrent in the anthracene crystal remarkably increases when trapped carriers were charged. It is explained as the optical release of the carriers from a deep trap, that is, detrapping process. By use of the increase of the photocurrent due to the detrapping, the informations on the carrier trapping mechanism and on the energy-depth of the deep trap were obtained. The energy-depth of the deep trap in anthracene was about 3 eV. In order to know the behavior of the deep trap, this method is useful.