2D Van der Waals Sliding Ferroelectrics Toward Novel Electronic Devices

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanoscience

Background:

• Ferroelectric materials possess switchable polarization, with early examples like Rochelle salt facing limitations.
• Perovskite ferroelectrics enabled stable thin films for semiconductor applications.
• Miniaturization in nanoelectronics necessitates research into low-dimensional ferroelectric materials.

Purpose of the Study:

• To review the advancements in two-dimensional (2D) van der Waals (vdW) ferroelectrics.
• To examine stacking orders and their link to ferroelectric polarization in 2D vdW materials.
• To explore the applications and future prospects of 2D vdW sliding ferroelectrics.

Main Methods:

• Comprehensive literature review of 2D vdW ferroelectric materials.
• Analysis of stacking configurations and their influence on polarization.
• Investigation of ferroelectricity in metallic, insulating, and semiconducting 2D vdW systems.

Main Results:

• 2D vdW ferroelectrics, such as CuInP2S6 and α-In2Se3, overcome nanoscale property loss.
• Sliding ferroelectricity, arising from polar stacking of non-polar monolayers, is a key discovery.
• Ferroelectric polarization is demonstrated across various 2D vdW material types based on stacking.

Conclusions:

• 2D vdW ferroelectrics represent a significant advancement over traditional materials for nanotechnology.
• Sliding ferroelectricity offers a new paradigm for designing and utilizing ferroelectric properties at the nanoscale.
• Further research into 2D vdW sliding ferroelectrics promises innovative applications in future electronic devices.