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Conduction in Nb/Nb2O5/In structures is strongly thickness dependent. Both present and previous data are interpreted by the model of an overlap MIM structure. In this model, conduction is through space-charge-limited flow of electrons injected from the metal electrode but the electrodes change the electron density in the oxide considerably due to the overlap of the two contact space-charge regions.
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Muhammad et al. (1985) studied this question.
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