Multi-level flash memory device based on stacked anisotropic ReS₂-boron nitride-graphene heterostructures

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Two-dimensional (2D) material heterostructures are promising for advanced memory devices.
• Current flash memories face limitations in size, capacity, speed, and power consumption.

Purpose of the Study:

• To develop a nonvolatile floating-gate memory device using a ReS₂/boron nitride/graphene heterostructure.
• To evaluate the performance of this device for next-generation flash memory applications.

Main Methods:

• Fabrication of a heterostructure memory device incorporating ReS₂.
• Characterization of the device's electrical properties, including memory window, current ratio, switching speed, endurance, and retention.

Main Results:

• The ReS₂ memory device demonstrated a large memory window (>100 V) and an ultrahigh current ratio (>10⁸).
• Achieved an ultrafast switching speed of 1 μs with hundreds of switching cycles and stable retention (~40% charge after 10 years).
• Utilized anisotropic electrical properties of ReS₂ for direction-sensitive multi-level data storage, enhancing data density.

Conclusions:

• The ReS₂ memory device shows significant potential for next-generation flash memories due to its scalability, capacity, speed, retention, and endurance.
• The device's unique properties may enable it to fulfill requirements across the entire memory device hierarchy.