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The extended Poole-Frenkel model presented here includes the variation of the barrier height with electric field in directions both opposite and forward to the electric force on an electron. The equation for the voltage-current characteristics based on this model gives not only the usual Poole-Frenkel equation at extremely high electric fields but also Ohm's law at low fields. Several published experimental data are in good agreement with this equation.
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Ieda et al. (1971) studied this question.
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