Heterosynaptic MoS₂ Memtransistors Emulating Biological Neuromodulation for Energy-Efficient Neuromorphic Electronics

Area of Science:

• Materials Science
• Neuroscience
• Electrical Engineering

Background:

• Biological neural networks achieve efficient processing through heterosynaptic neuromodulation.
• Conventional memristors and synaptic transistors struggle to replicate complex synaptic modulation.

Purpose of the Study:

• To develop a three-terminal heterosynaptic memtransistor capable of emulating biological neuromodulation.
• To investigate defect-mediated conduction for memristive switching and gate-tuned modulation.

Main Methods:

• Fabrication of a three-terminal memtransistor using a molybdenum disulfide channel with intentional defects.
• Characterization of defect-mediated space-charge-limited conduction and gate-tuned trap state modulation.
• Evaluation of the device's performance as an artificial synapse for pattern recognition.

Main Results:

• The memtransistor exhibits memristive switching characteristics modulated by both source and gate terminals.
• Sub-femtojoule impulses control the artificial synapse, consuming less energy than biological counterparts.
• Electrostatic gate modulation independently adjusts synaptic weight dynamics, improving learning accuracy and efficiency.

Conclusions:

• The developed heterosynaptic memtransistor offers a new pathway for energy-efficient neuromorphic computing.
• This technology enables highly networked systems with improved learning capabilities.
• The device represents a significant advancement in artificial synapse technology.