Configurable multi-state non-volatile memory behaviors in Ti₃C₂ nanosheets

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• MXenes possess unique metallic conductivity and hydrophilicity, making them promising for electronic applications.
• The use of MXenes in non-volatile resistive random-access memories (RRAMs) is largely unexplored.
• Resistive random-access memories are crucial for next-generation data storage.

Purpose of the Study:

• To investigate the potential of MXenes, specifically Ti3C2, as an active component in RRAM devices.
• To characterize the performance and switching mechanisms of Ti3C2-based RRAM.
• To explore the feasibility of flexible RRAM devices using MXene materials.

Main Methods:

• Fabrication of RRAM devices utilizing Ti3C2 MXene as the active layer.
• Characterization of electrical properties including switching behavior, retention, and reliability.
• Investigation of multi-state storage by adjusting compliance currents.
• Analysis of the resistive switching mechanism using conductive atomic force microscopy (C-AFM) and Kelvin probe force microscopy (KPFM).
• Fabrication of flexible RRAM devices on plastic substrates.

Main Results:

• The Ti3C2-based RRAM exhibited typical bipolar switching characteristics.
• The device demonstrated excellent long retention, low SET voltage, good mechanical stability, and high reliability.
• Multi-state information storage was successfully achieved by controlling compliance currents.
• Charge trapping assisted hopping was identified as the primary resistive switching mechanism.
• Flexible Ti3C2-based RRAM devices were successfully fabricated on plastic substrates, retaining good performance.

Conclusions:

• Ti3C2 MXene is a viable and promising material for fabricating high-performance RRAM devices.
• The developed MXene-based RRAM offers potential for advanced data storage solutions, particularly in flexible electronics.
• This work opens new avenues for MXene applications in memory technologies and beyond.