Frequency resolved photoconductivity of bulk CdS single crystals

Abstract

Photoconductivity measurements in CdS single crystal showed that a.c. photoconductivity decays as w-', with s value = {1 + u ) for o > l /~ and = { lu } for w < I/T. At low frequency values, recombination might be controlled by monomolecular behaviour. As the frequency increases bimolecular behaviour, in shallow states, dominates. Direct recombination is found to be weak dependent on both the intensity and applied voltage. However when band tail recombination is dominant (at higher frequencies), strong dependence is observed.