Electromechanical behaviour of violet phosphorene nanoflakes

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Physics

Background:

• Violet phosphorene (vP) is a 2D material with notable properties, attracting significant research interest.
• Understanding the electromechanical behavior of vP is crucial for its application in electronic devices.

Purpose of the Study:

• To investigate the electromechanical failure behavior of supported and suspended vP nanoflakes.
• To analyze the influence of load and bias voltage on vP's mechanical and electrical properties.
• To explore the role of local heating and oxidation in vP's electromechanical response.

Main Methods:

• Utilized conductive atomic force microscopy (c-AFM) nanoindentation to probe vP nanoflakes.
• Applied varying loads and bias voltages to observe electromechanical responses.
• Employed density functional theory (DFT) to analyze vP's specific heat capacity and conductivity.

Main Results:

• Supported vP showed oxidation-induced bumps under mild load and bias voltage due to local heating.
• Concave morphology was observed in supported vP at 1500 nN load and 10 V bias.
• Suspended vP exhibited no bumps due to larger contact area and lower temperature; fatigue damage occurred under cyclic voltage.

Conclusions:

• The electromechanical behavior of vP is significantly influenced by substrate support, local heating, and applied voltage.
• vP's susceptibility to oxidation and fatigue damage under specific electrical and mechanical stresses are critical failure mechanisms.
• DFT analysis provides insights into the fundamental properties governing vP's electromechanical responses.