A Low-Voltage Stretchable Synaptic Transistor Array for Temperature Perception, Facilitated Associative Learning, and...

Area of Science:

• Materials Science
• Neuroscience
• Electronics

Background:

• Stretchable synaptic transistors are key for neuromorphic systems in soft robotics and wearables.
• Temperature perception and low-power operation are crucial for biological fidelity and energy efficiency.
• The interaction between mechanical strain, temperature, and synaptic function is not well understood.

Purpose of the Study:

• To develop and characterize a temperature-modulated stretchable synaptic transistor (TM-SST) array.
• To investigate the impact of temperature on synaptic properties and neuromorphic performance.
• To demonstrate enhanced functionality through temperature modulation.

Main Methods:

• Fabrication of a high-density TM-SST array using photolithography and a transfer-free process.
• Integration of a semiconductor carbon nanotube (s-CNT) network channel and an SU-8 dielectric layer.
• Characterization of device performance under varying temperatures (10-40 °C) and mechanical strain (up to 40%).

Main Results:

• Achieved high on-off ratio (∼10^5) at low gate voltage (±2.5 V).
• Demonstrated temperature-dependent modulation of postsynaptic current (PSC), plasticity, memory retention, and paired-pulse facilitation (PPF).
• Observed stable performance under 40% strain and enhanced memory retention (seconds to minutes) with a 15 °C cooling.

Conclusions:

• The developed TM-SST array enables temperature perception for enhanced neuromorphic functionality.
• Temperature modulation offers a novel pathway to improve learning speed and memory retention in stretchable synaptic devices.
• This work advances the development of bio-inspired electronic systems for applications requiring sensory feedback and adaptive learning.