Measurement of Nonlinear Polarization of KTaO3 using Schottky Diodes

Abstract

Capacitance vs bias voltage data are presented for Au–KTaO₃ surface barrier Schottky diodes. Substantial deviations from the normal Schottky capacitance relationship have been observed and attributed to a field‐dependent dielectric constant in the depletion layer. From the capacitance data obtained at room temperature, ε vs E and P vs E curves have been calculated for KTaO₃ and found to be consistent with previous measurements made using conventional techniques at 4.2°K.