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Pre-synaptic DC bias controls the plasticity and dynamics of three-terminal neuromorphic electrolyte-gated organic transistors

2023; IOP Publishing; Volume: 3; Issue: 1 Linguagem: Inglês

10.1088/2634-4386/acb37f

2634-4386

Federico Rondelli, Anna De Salvo, Gioacchino Calandra Sebastianella, Mauro Murgia, Luciano Fadiga, Fabio Biscarini, Michele Di Lauro,

Neuroscience and Neural Engineering

Abstract The role of pre-synaptic DC bias is investigated in three-terminal organic neuromorphic architectures based on electrolyte-gated organic transistors—EGOTs. By means of pre-synaptic offset it is possible to finely control the number of discrete conductance states in short-term plasticity experiments, to obtain, at will, both depressive and facilitating response in the same neuromorphic device and to set the ratio between two subsequent pulses in paired-pulse experiments. The charge dynamics leading to these important features are discussed in relationship with macroscopic device figures of merit such as conductivity and transconductance, establishing a novel key enabling parameter in devising the operation of neuromorphic organic electronics.