Introduction of Ionic Contributions to a Charge Transport Model for Dielectrics

Modelling charge transport in insulating polymers is not new, but the challenge remains to extend the models to predict the space charge behavior in any insulating material under electrical and/or thermal stress, mostly. Bipolar charge transport models already developed account mainly for electronic charges transport, trapping into deep traps, detrapping and recombination. However, besides electronic carriers, ions are believed to play a significant contribution both in the space charge behavior and on the current. As it is difficult experimentally to dissociate the role of electronic and ionic species, we propose in this paper to observe the impact of the presence of ions by resolving elementary generation and transport processes and combining it to electronic phenomena. Simulation results are then discussed as regards the possible improvements of the model, and the possible improvement in the understanding and deciphering the experimental data.