A Note on the Theory of Space Charge Limited Currents

In order to explain the observed non-ohmic conductivity in barium titanate and cadmium sulphide, it is necessary to assume that the current is space charge limited. Previous work on space charge limited currents has failed to predict the correct thickness dependence. In this paper a model is proposed wherein there are thin layers of uncharged traps at the surface of the dielectric uniformly distributed in space and of one energy depth; the bulk of the material contains no traps. Using this model the observed experimental results can be explained.