Comparative Study of Negative Differential Capacitance in Ferroelectric Capacitors: P(VDF0.75-TrFE0.25) and P(VDF0.50-TrFE0.50)

Abstract

The transient response of the negative capacitance (NC) in a P(VDFSUB0.75/SUB-TrFESUB0.25/SUB) ferroelectric capacitor is experimentally compared against that of a P(VDFSUB0.50/SUB-TrFESUB0.50/SUB) ferroelectric capacitor. To measure first-hand the negative capacitance of the capacitor, a basic resistor-capacitor (RC) series circuit consisting of an external resistor and the ferroelectric capacitor was constructed. It was verified that the time duration of the NC could be adjusted based on the value of the external resistor. It was also confirmed that the transient response of the NC of the P(VDFSUB0.75/SUB-TrFESUB0.25/SUB) ferroelectric capacitor versus that of the P(VDFSUB0.50/SUB-TrFESUB0.50/SUB) ferroelectric capacitor was more sensitive to variation in the external resistor values. This is attributed to the reason that the polarization switching of P(VDFSUB0.75/SUB-TrFESUB0.25/SUB) ferroelectric capacitor is faster than that of the P(VDFSUB0.50/SUB-TrFESUB0.50/SUB) ferroelectric capacitor.