We have developed a new type of transistor that can mimic the functions and behaviors of biological synapses, which are the connections between neurons in the brain. Our transistor has a special polymer layer of cross-linked poly-4-vinyl phenol (PVP), which can form electric-double-layers (EDL) with high capacitance. This layer allows us to control the synaptic weight and the learning ability of our transistor by applying different gate voltages. We also used zinc oxynitride for the channel, which have higher mobility than oxide materials. Unlike conventional memristors, our transistors can perform signal transmission and learning functions simultaneously. It can also emulate a variety of synaptic behaviors such as excitatory postsynaptic current, paired-pulse facilitation, long-term memory, and filtering capability. Our transistor is a promising device for artificial intelligence systems that require brain-like computing.
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