Comparative Study of Negative Capacitance in Ferroelectric Capacitors : P(VDF0.75-TrFE0.25) Versus Pb(Zr, Ti)O₃

Abstract

Negative capacitance (NC) has received much attention as a solution to overcome the physical limit of sub-threshold slope (SS) of metal-oxidesemiconductor field-effect transistors (MOSFETs). With the help of a step-up internal voltage amplification by NC, sub-60-mV/decade steep switching MOSFET (or negative capacitance FET, NCFET) was experimentally demonstrated. In this work, the transient response of NC in a P(VDFSUB0.75/SUB-TrFESUB0.25/SUB) organic ferroelectric capacitor is experimentally compared against that in a Pb(Zr, Ti)O₃ inorganic ferroelectric capacitor. It is confirmed that the RC time constant of the Pb(Zr, Ti)O₃ capacitor was smaller than that of the P(VDFSUB0.75/SUB-TrFESUB0.25/SUB) capacitor owing to the low internal resistance of Pb(Zr, Ti)O₃.