Further results from the modeling of the dielectric response of materials containing mobile charge

Abstract

Two models, a modified Sterne-Weaver model and the hopping model, have been developed to study the dielectric response of materials containing mobile charge. The first model is the same as the basic Sterne-Weaver model except that both species of charge carrier are free to move. It is shown that by regarding the movement of the charge carrier as a hopping process across a potential barrier of specified height and width, the effects of the applied electric field on the movement of the carriers can be calculated by considering the modifications it causes to the successful-jump probability. The two models behave in a similar fashion under steady-state conditions. This contrasts with the behavior described previously, when lower values of activation energy (higher mobilities) were used. Under those conditions an order of magnitude change was observed in the polarization response of the two models coupled with a considerable difference in the phase relationship of the polarization to the applied field. In addition, a transient component of polarization is observed in the present study that was not observed previously. >