Transient current across insulating films with long-range movements of charge carriers

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Abstract
Based on the ion hopping model, the dielectric relaxation phenomena in insulating films with long-range movements of charge carriers have been analyzed without neglecting space-charge field and diffusion. The transient current flowing across insulating films with long-range movements of charge carriers (impurity ions) which are blocked at the electrodes was analyzed. It was found that the time-dependent transient current first decreases, then increases, and finally decreases again, possibly due to the space-charge field formed in the films. Thermally stimulated depolarization current across insulating films due to impurity ions was also analyzed. In order to clarify the nonmonotonic time dependence of the aforementioned transient current, the time-dependent current was calculated without taking into account the space-charge field. It was found that the current monotonously decreases in this case. Finally, we concluded that the calculation method based on the ion hopping model is helpful for a better understanding of the dielectric relaxation phenomena in insulating films with long-range movements of charge carriers.