Synthesis and intrinsic out-of-plane ferroelectricity of 2D Bi2SiO5

Release time:2025-09-15

Journal:Nano Research

Abstract:Two-dimensional (2D) ferroelectric materials demonstrate promising applications in nanoelectronics owing to their ultrathin thickness and spontaneous polarization. However, as the thickness decreases, ferroelectricity is often suppressed by depolarization effects, making 2D ferroelectric materials extremely scarce. Here, we report the intrinsic out-of-plane (OOP) ferroelectricity in 2D Bi2SiO5 (BSO) nanosheets. 2D BSO nanosheets were synthesized through a chemical vapor deposition (CVD) process, and their non-centrosymmetric structure was confirmed through second-harmonic generation (SHG) response. Switchable polarization and ferroelectric hysteresis loops in BSO nanosheets are revealed by piezo-response force microscopy (PFM) measurements. The ferroelectric switching behavior is further validated in a device made of a BSO nanosheet. The ferroelectricity in 2D BSO significantly expands the family of 2D ferroelectric materials and paves the way for their integration into nonvolatile memory devices.

Co-author:Miaomiao Liu, Shanhao Li, Liqiang Zhang, Hua Zhang, Dan Li, Hongmei Zhang, Yingying Liu

First Author:Wang Di

Indexed by:Journal paper

Correspondence Author:Zhihui Chen#, Xidong Duan#

Translation or Not:no

Date of Publication:2025-09-15

Included Journals:SCI