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Existing experimental data on the bulk conductivity of Ta₂O₅ and SiO films are shown to be consistent with the Schottky effect rather than the Poole-Frenkel effect. A discussion of the physical properties of vacuum-deposited insulators has led to a simple model in which the insulator is proposed to contain neutral traps and donor centers. This model is shown to resolve the above-mentioned "anomalous" Poole-Frenkel effect. Other simple models are discussed, but they do not exhibit the anomalous Poole-Frenkel effect.
J.G. Simmons (Wed,) studied this question.