Novel Two-Dimensional ABX₃ Dirac Materials: Achieving a High-Speed Strain Sensor via a Self-Doping Effect.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) Dirac materials offer unique electronic properties but their pristine semimetal nature limits device applications.
• Developing novel 2D materials with tunable electronic characteristics is crucial for advancing electronic technologies.

Purpose of the Study:

• To introduce a new class of 2D Dirac materials, ABX3 monolayers, with potential for improved electronic applications.
• To investigate the stability, electronic properties, and strain responses of these novel materials.

Main Methods:

• Computational screening and theoretical analysis of 14 ABX3 monolayer structures.
• Investigation of electronic band structures to identify Dirac cones and self-doping effects.
• Simulation of strain effects on the ClPSi3 monolayer and analysis of current-voltage characteristics.

Main Results:

• 14 stable ABX3 monolayers were identified with high Fermi velocities.
• Several monolayers, including FPC3, ClPC3, BrPC3, and FAsC3, exhibit n-type self-doping Dirac cones, beneficial for high-speed carriers.
• The ClPSi3 monolayer demonstrates a significant strain response, with a self-doping Dirac cone induced by -5% biaxial strain, showing 11.57 times the response of graphene sensors.

Conclusions:

• ABX3 monolayers represent a promising new family of 2D Dirac materials.
• The self-doping Dirac cones in these materials enhance carrier mobility for high-speed electronics.
• The ClPSi3 monolayer shows exceptional potential as a highly sensitive strain sensor for electronic devices.