Reconfigurable Multifunctional Semifloating Gate Transistors Based on the ReSe₂/h-BN/Graphene van der Waals...

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• The post-Moore era demands novel devices for nonvolatile memory and reconfigurable logic.
• Two-dimensional (2D) materials offer unique properties like atomically flat surfaces and high carrier mobility.
• Rhenium disulfide (ReSe₂) is a promising 2D material due to its ambipolar characteristics and optoelectronic response.

Purpose of the Study:

• To fabricate and characterize a multifunctional semifloating gate (MFSFG) device using ReSe₂.
• To explore the device's capabilities as bidirectional nonvolatile reconfigurable homojunctions, photodetectors, and artificial synapses.
• To demonstrate the device's potential for reconfigurable logic and half-wave rectification.

Main Methods:

• Fabrication of ReSe₂/h-BN/Gr MFSFG devices.
• Electrical characterization of device performance, including rectification ratios, endurance, and retention.
• Optoelectronic measurements under 532 nm illumination to assess photodetector performance.
• Evaluation of synaptic plasticity and implementation in a convolutional neural network.
• Demonstration of logical functions (XOR, XNOR, NAND, OR) and half-wave rectification.

Main Results:

• Achieved high rectification ratios of ~10⁶ (P-N) and ~10⁴ (N-P) with excellent endurance and retention.
• Demonstrated superior photodetector performance with high responsivity and detectivity.
• Successfully emulated synaptic plasticity, achieving high classification accuracy in a neural network.
• Integrated multiple logic functions and half-wave rectification within a single device under photoelectrical control.

Conclusions:

• The ReSe₂/h-BN/Gr MFSFG device offers a versatile platform for multifunctional electronic applications.
• This work advances the use of 2D materials in neuromorphic computing and logic-in-memory architectures.
• The device's capabilities pave the way for next-generation integrated circuits beyond traditional scaling.