G. Fortunato et al., APPLICATION OF THE PHOTO INDUCED DISCHARGE TECHNIQUE FOR THE INVESTIGATION OF A-SI-H THIN-FILM-TRANSISTOR INSTABILITY, Journal of non-crystalline solids, 166, 1993, pp. 735-738
Photo Induced Discharge technique has been used in order to probe the
density of states at and below the Fermi level before and after positi
ve gate bias-stress. From the results presented here, flat-band voltag
e variation rather than gap-state modifications seems to be the major
effect induced by the bias-stress.