Flexible Proton-Gated Oxide Synaptic Transistors on Si Membrane

Abstract

Ion-conducting materials have received considerable attention for their applications in fuel cells, electrochemical devices, and sensors. Here, flexible indium zinc oxide (InZnO) synaptic transistors with multiple presynaptic inputs gated by proton-conducting phosphorosilicate glass-based electrolyte films are fabricated on ultrathin Si membranes. Transient characteristics of the proton gated InZnO synaptic transistors are investigated, indicating stable proton-gating behaviors. Short-term synaptic plasticities are mimicked on the proposed proton-gated synaptic transistors. Furthermore, synaptic integration regulations are mimicked on the proposed synaptic transistor networks. Spiking logic modulations are realized based on the transition between superlinear and sublinear synaptic integration. The multigates coupled flexible proton-gated oxide synaptic transistors may be interesting for neuroinspired platforms with sophisticated spatiotemporal information processing.

Ionotronic Neuromorphic Devices for Bionic Neural Network Applications

“…Specifically, the release and retreat of neurotransmitters lead to the short‐term depolarization or hyperpolarization of the postsynaptic membrane, i.e., short‐term synaptic plasticity . Thus, based on the EDL mechanism, short‐term synaptic plasticity can be mimicked on EDLTs . Meantime, electrochemical doping/de‐doping can also cause ionic species to trap in the channel and lead to the long‐term changes in channel conductances.…”

Flexible, Conformal Organic Synaptic Transistors on Elastomer for Biomedical Applications

“…In nervous system, synaptic plasticity is an important foundation of learning and memory. Short‐term plasticity (STP) and long‐term plasticity (LTP) are two basic types of synaptic plasticity . The change of synaptic weight lasts only a few seconds and then decreases down to its initial value in STP, while the change can persist for a relatively longer time in LTP.…”

“…However, synaptic transistor for biomedical applications, such as implanted treatment and human–machine interface, must be mechanically compatible with the biological tissues, with good flexibility . Its fabrication requires each component of transistor, including semiconductor, dielectric, electrodes, and support, with well tolerated mechanical deformation . One main challenging problem is that the inherent rigid nature of inorganic materials makes the conventional synaptic transistors difficultly bent under large strain or conformed on the curved objects.…”

Flexible Neuromorphic Electronics for Computing, Soft Robotics, and Neuroprosthetics

“…A presynaptic gate voltage pulse drove migration of H + ions; they accumulated at interfaces between insulator and metal oxide, and thereby showed synaptic characteristics. [57,115,[126][127][128][129] In 2D nanomaterials (e.g., transition metal dichalcogenide, graphene) and electrolyte-based artificial synapses, ions were electrochemically intercalated into the layered nanomaterials according to the presynaptic gate voltage pulses; synaptic responses have been demonstrated. [52,116,117]…”

“…For flexibility, neuromorphic electronics have been fabricated on paper substrates, [66,126] Si membrane, [127] and polymer substrates including poly(ethylene naphthalate) (PEN), [85,86,91,130,131] polyimide (PI), [64,81,132] poly(ethylene terephthalate) (PET), [4,[73][74][75]82,83,110,115,[133][134][135][136][137] chitosan membrane, [138] and silk. [139] Other components such as semiconductor layers and gate insulators have adopted the groups based on 2D materials, [91,131,135] organic materials, [4,73,74,82,83,91,110,133,136,140,141] metal oxide, [64,66,115,127,130,131,138,…”