Investigating the Switching Dynamics of Antiferroelectric Capacitor Using Multidomain Phase-Field Approach

Here, we present a compact model based on multidomain phase-field approach that can capture the hysteresis loop and the transient negative capacitance (NC) regions in Metal-Antiferroelectric-Metal structures. The model solves time-dependent Ginzburg-Landau (TDGL) and Poisson equation self-consistently to evaluate the polarization and potential distribution, respectively. We also discuss the significance of a dynamic kinetic coefficient to accurately capture the NC effect in antiferroelectric (AFE) capacitors. The proposed model adeptly captures all four transient NC regions (two antiferroelectric to ferroelectric transitions and two ferroelectric to antiferroelectric transitions) observed during a full switching cycle of an antiferroelectric capacitor.