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.

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