ON THE FREQUENCY-DEPENDENCE OF RADIATION-INDUCED CONDUCTIVITY OF POLYMERS WITHIN THE HOPPING MECHANISM OF CHARGE-CARRIER MOBILITY

Theoretical models allowing for the hopping nature of charge-carrier t ransport and recombination in polymers are used to interpret experimen tal data on radiation-induced DC (gamma(r)) and AC (gamma(r omega)) co nductivity. The results permit qualitative explanation of such effects as an increase in gamma(r omega) with the frequency according to a po wer law, excess by an order or two of gamma(r omega) over gamma(r) in various polymeric materials, and time histories of gamma(r omega) and gamma(r) under continuous radiation. The consistent variation of gamma (r omega)/gamma(r) and the recombination in some polymers can be expla ined by a small difference between the characteristic lengths of charg e-carrier hops in these materials.