Recent progress on two-dimensional ferroelectrics: Material systems and device applications

Abstract

Ferroelectrics are a kind of material with polar structure and the polarization direction can be inverted reversibly by applying electric field. They have attracted tremendous attention for their extensive applications in nonvolatile memory, sensors and neuromorphic computing. However, the conventional ferroelectric materials face insulating and interfacial issues in the commercialization process. In contrast, two-dimensional (2D) ferroelectric materials usually have excellent semiconductor performance, clean van der Waals interfaces and robust ferroelectric order in atom-thick layers, which holds greater promise for constructing multifunctional ferroelectric optoelectronic devices and nondestructive ultra-high-density memory. Recently, 2D ferroelectrics have obtain impressive breakthroughs, showing overwhelming superiority. Herein, firstly, the progress of experimental research on 2D ferroelectric materials is reviewed. Then, the preparation of 2D ferroelectric devices and their applications are discussed. Finally, the future development trend of 2D ferroelectrics is prospected.