 The detection of Poole-Frenkel emission as the limiting conduction process in a dielectric is usually made studying the slope in the so-called Poole-Frenkel plot, where the logarithm of the current density divided by the field (formula_21) versus the square root of the field (formula_22) is depicted.The idea of such a plot originates from the expression of the Poole-Frenkel current density, which contains this proportionality (formula_21 vs formula_22), and would thus result in a straight line in this plot.For a fixed value of the voltage barrier in absence of any applied electric field, the slope is influenced by just one parameter