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Capacitance;dielectric hysteresis;dielectric polarisation;ferroelectric coercive field;ferroelectric switching;ferroelectric thin films;Landau-Khalatnikov model;coercive voltage;hysteresis loop;polarization switching;thin-film ferroelectric capacitance;voltage dependence;Capacitance measurement;Capacitance-voltage characteristics;Ferroelectric materials;Hysteresis;Polarization;Transistors;Voltage
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Capacitance Of Thin-Film Ferroelectrics Under Different Drive Signals, Huadong Li, Guru Subramanyam
Capacitance Of Thin-Film Ferroelectrics Under Different Drive Signals, Huadong Li, Guru Subramanyam
Guru Subramanyam
Thin-film ferroelectric capacitance can be obtained by 2 different methods. Capacitance obtained using the derivative of its hysteresis loop is related to large applied signals and can be called the large-signal capacitance. Capacitance measured directly with a small, applied ac signal together with a slow changing dc bias is called the small-signal capacitance. This paper investigated the voltage dependence of the large- and small-signal capacitances. Measurements show that the large-signal C-V curve of thin-film ferroelectrics has much sharper peaks and higher peak values than the small-signal C-V curve. Analyses based on the Landau-Khalatnikov model shows that practical small-signal capacitance is …