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Heterobilayer Ferroelectricity with Competitive Polarization.

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Summary
This summary is machine-generated.

We discovered 43 new 2D ferroelectrics with large out-of-plane polarization for low-power electronics. CdO/InN shows exceptional polarization and low switching energy, advancing ferroelectric materials research.

Keywords:
decomposed dipole contributionsheterobilayershigh-throughput calculationtwo-dimensional ferroelectricsvertical polarizations

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Area of Science:

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

Background:

  • Two-dimensional (2D) ferroelectrics are crucial for next-generation low-power electronic devices.
  • Experimental realization of 2D ferroelectrics with large out-of-plane polarization (OOP) is challenging due to material limitations.

Purpose of the Study:

  • To identify novel 2D semiconducting heterobilayer ferroelectrics with enhanced out-of-plane polarization.
  • To discover materials with low energy barriers for sliding ferroelectric switching.
  • To develop a predictive physical model for heterobilayer ferroelectric behavior.

Main Methods:

  • High-throughput computational screening of 24,960 heterobilayer configurations.
  • Analysis of polarization, sliding barriers, and electronic properties.
  • Development of a multiscale physical model combining structural projection and polarization decomposition.

Main Results:

  • Identified 43 semiconducting heterobilayer ferroelectrics with OOP exceeding MoS2/WS2 and low sliding barriers (<100 meV/f.u.).
  • CdO/InN demonstrated an OOP ~50 times greater than MoS2/WS2 with a low sliding barrier of ~35 meV/f.u.
  • Established a link between monolayer properties and heterobilayer ferroelectric response, revealing dipole competition.

Conclusions:

  • A significant library of 2D ferroelectric heterobilayers with promising properties for electronic applications has been generated.
  • CdO/InN emerges as a top candidate for high-performance, low-power ferroelectric devices.
  • The developed physical model provides fundamental insights into the mechanisms governing sliding ferroelectricity in heterobilayers.