Charge dynamics as revealed by pulse discharge current spectra in polymer films

Abstract

Space charge dynamics were studied by analyzing the pulse discharge current spectra in polymer film. Polymer samples with aluminum-metalized electrodes on both sides were subjected to negative DC field of 200-400 MV/m for 1-10 minutes. The subsequent short circuit current by connecting the two sides was monitored by AC current probe P6022 (Tektronix). The time coefficient of the decreasing oscillating current was found to be a changeable parameter. The periods of oscillating current almost are a constant. These results were thought to relate to charge injection and charge traps features.