Polarization behaviour of iodine-doped polystyrene

Thermally stimulated currents (TSCs) from iodine-doped polystyrene (PS) thermoelectrets have indicated that the polarization is due to the localization of an injected charge in geometrically and energetically distributed traps. Anomalous TSCs, observed with strongly doped samples, are considered to be due to the release of injected space-charge carriers and the partial blocking of the metal-polymer contact. As the number of shallow traps with small detrapping increases with increasing dopant concentration, the space-charge density will be relatively greater in room-temperature-charged samples with strong doping than in samples charged at this temperature with weaker doping. >