A stretchable transistor for neuromorphic devices

Artificial synaptic transistors that exhibit both excitatory and inhibitory behaviour can realize reconfigurable synaptic functions, enabling new functionalities and efficient computing. If the transistors are also soft and deformable, they can unlock multi-functional soft neuromorphic computing systems, wearable electronic devices and soft robots. Cunjiang Yu and collaborators present a soft, reconfigurable synaptic transistor based on a top-gated stretchable bilayer semiconductor and using an encapsulating elastomer as the gate dielectric. The semiconductor consists of a polymer film on single-walled carbon nanotube networks. Polar functional groups in the gate dielectric enable charge trapping, giving rise to the synaptic characteristics. The rubber dielectric encapsulation protects the device from the environment but also prevents crack formation and propagation, such that the transistor retains its inhibitory and excitatory characteristics even when stretched by 50%. Stretchable and reconfigurable transistors will enable soft neuromorphic devices that, beyond being stretchable, will benefit from a reduced number of transistors and simplified circuitry.

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