Characteristics of ethyl cellulose (EC): polymethyl methacrylate (PMMA) blend electrets

Mechanisms of charge production and its persistence in one and both side vacuum-aluminized EC:PMMA blend foil thermoelectrets, prepared under different field and temperature conditions, have been analyzed using the short- and open-circuit thermally stimulated current (TSC) techniques. The results indicate the existence of heterocharge due to dipole orientation and ionic charge drift together with the injection of charge carriers from electrodes with their subsequent localization in surface and bulk traps. Various characteristics of both types of thermograms indicated the injection of charge carriers from electrodes during short-circuit TSC under high electric field created at the interface by the strong heterocharge