A Schottky contact consisting of a semiconducting ferroelectric material and a high work function metal shows a bistable conduction characteristic. An on/off ratio of about 2 orders of magnitude was obtained in a structure consisting of a 0.2 {μ}m ferroelectric PbTiO₃ film, a Au Schottky contact, and a La0.5{Sr}0.5$Co${O}₃$ Ohmic bottom electrode. The observations are explained by a model in which the depletion width of the ferroelectric Schottky diode is determined by the polarization dependence of the internal electric field at the metal-ferroelectric interface.
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Blom et al. (1994) studied this question.
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