Organic Synaptic Transistors with an Ultra-Short-Term Weight-Reconstruction for Processing Multiple Types of Signals

An organic synaptic transistor (OST) that utilizes a multiple-annealing process and an ion gate to achieve significant reductions in operating voltage and increases in transconductance is demonstrated. The OST exhibits an ultra-short-term plasticity (USTP) with a maximum retention time of only 20.7 ms, which does not increase with the number and duration of spikes. This is the shortest retention time yet achieved by an ion-gel-regulated synaptic transistor. In addition, OST-integrated array exhibits a tunable weight plasticity and a short weight refresh time for a stable image resetting in ample time of <0.2 s. It is also sensitive to the frequency and amplitude of electrical inputs; a low-frequency suppression and a nonlinear amplitude gain enables OST-constructed filter for use in processing multiple types of signals. This work is a step toward constructing high-performance and multifunctional artificial intelligent systems.