Scalable Synthesis of High‐Quality Ultrathin Ferroelectric Magnesium Molybdenum Oxide

Abstract

The development of ultrathin, stable ferroelectric materials is crucial for advancing high‐density, low‐power electronic devices. Nonetheless, ultrathin ferroelectric materials are rare due to the critical size effect. Here, we present a novel ferroelectric material, magnesium molybdenum oxide (Mg2Mo3O8). High‐quality ultrathin Mg2Mo3O8 crystals have been synthesized using chemical vapor deposition. Ultrathin Mg2Mo3O8 has a wide bandgap (∼4.4 eV) and nonlinear optical response. Mg2Mo3O8 crystals of varying thicknesses exhibit out‐of‐plane ferroelectric properties at room temperature, with ferroelectricity retained even at a 2 nm thickness. The Mg2Mo3O8 exhibits a relatively large remanent polarization ranging from 33 to 52 μC/cm2, which is tunable by changing its thickness. Notably, Mg2Mo3O8 possess a high Curie temperature (>980 °C) across various thickness. Moreover, the as‐grown Mg2Mo3O8 crystals display remarkable stability under harsh environments. This work introduces nolanites‐type crystal into ultrathin ferroelectrics. The scalable synthesis of stable ultrathin ferroelectric Mg2Mo3O8 expands the scope of ferroelectric materials and may prosper applications of ferroelectrics.This article is protected by copyright. All rights reserved