The modelling of DC conductivity of thin disorder dielectrics

The DC conductivity of disordered dielectric films is theoretically investigated assuming that there are two subsystems of charged species involved in the conduction process: one ensuring an electronic hopping transport and another of much less mobile carriers forming an inhomogeneous and non-stationary space charge in the dielectric. A system of differential equations specifying current density, electric field strength and boundary conditions for the dielectric is evolved and digitally simulated assuming its specific features, such as stiffness, turning point presence, etc. The results are compared with experimental data on DC conductivity of polar and non-polar thin film dielectrics, with special emphasis on anodic oxide films.