Abstract
Thermally stimulated currents (TSCs) in short-circuit and open-circuit configuration for ethyl cellulose samples (≈40 µm thick) have been studied as a function of polarizing field (25–100kV/cm) and polarizing temperature (323–353K). The thermograms have been found to be characterized by two prominent peaks located around 70 ± 10°C and 140 ± 10°C and the appearance of anomalous current in the high temperature region of the short-circuit TSC thermograms. The observed behaviour has been explained in terms of the existence of heterocharge due to dipole orientation and ionic homocharge drift, together with the injection of charge carriers from electrodes and their subsequent localization in surface and bulk traps.
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