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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Robust ferroelectricity in two-dimensional SbN and BiP.

Chang Liu1, Wenhui Wan, Jie Ma

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Summary

Two new 2D ferroelectric materials, antimony nitride (SbN) and bismuth phosphide (BiP), have been discovered. These stable materials exhibit robust ferroelectricity above room temperature, with SbN showing record polarization, making them promising for future electronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Two-dimensional (2D) materials are crucial for next-generation electronics.
  • Ferroelectric materials exhibit spontaneous electric polarization, essential for memory and logic devices.
  • Discovering new, stable 2D ferroelectrics with high performance is an ongoing research challenge.

Purpose of the Study:

  • To computationally discover novel two-dimensional (2D) ferroelectric materials.
  • To investigate the structural stability and ferroelectric properties of these new materials.
  • To explore the potential of these materials for future integrated ferroelectric devices.

Main Methods:

  • Employed first-principles calculations to predict and analyze material properties.
  • Investigated structural stability using energetic calculations.
  • Evaluated ferroelectric characteristics, including spontaneous polarization and switching barriers.

Main Results:

  • Identified two new stable 2D ferroelectric materials: antimony nitride (SbN) and bismuth phosphide (BiP).
  • Both materials exhibit ferroelectricity above room temperature and possess a phosphorene-like structure.
  • SbN demonstrates the highest in-plane spontaneous polarization (7.81 × 10-10 C m-1) among known 2D ferroelectrics and maintains ferroelectricity up to 1700 K.
  • Spontaneous polarization and switching barriers are tunable via strain engineering.
  • Ferroelectricity persists in multilayered structures of SbN and BiP.

Conclusions:

  • SbN and BiP represent significant advancements in the field of 2D ferroelectric materials.
  • Their high spontaneous polarization, thermal stability, and tunability make them highly promising for advanced electronic applications.
  • These materials are strong candidates for the development of future integrated ferroelectric devices.