Switching Dynamics and Energy Storage Properties of Fluorite‐Structured Materials

The fluorite‐structural ferroelectric (FE) and antiferroelectric (AFE) materials exhibit promising applications in memories and energy storage devices. However, understanding frequency‐dependent polarization and phase switching, which is very important for electronic device performance, is still a critical problem. Herein, frequency‐dependent polarization and phase switching of the Si‐doped HfO 2 ‐based metal–dielectric–metal capacitors with FE and AFE‐like thin films, respectively, are investigated. The Kolmogorov–Avrami–Ishibashi (KAI) and nucleation‐limited switching models are used to attain detailed information on polarization switching of Si‐doped HfO 2 FE thin films. Moreover, energy storage properties of Si‐doped HfO 2 AFE thin films are investigated at a wide measurement frequency range (50 Hz–100 kHz). Both energy storage density and energy storage efficiency decrease with increasing frequency. However, energy loss increases with increasing testing frequency.