Enhancement of Synaptic Characteristics Achieved by the Optimization of Proton–Electron Coupling Effect in a Solid-State Electrolyte-Gated Transistor

Dong Gyu Jin, Seung Hwan Kim, Seung Geun Kim, June Park, Euyjin Park, Hyun Yong Yu

Research output: Contribution to journalArticlepeer-review

Abstract

Presently, the 3-terminal artificial synapse device has been in focus for neuromorphic computing systems owing to its excellent weight controllability. Here, an artificial synapse device based on the 3-terminal solid-state electrolyte-gated transistor is proposed to achieve outstanding synaptic characteristics with a human-like mechanism at low power. Novel synaptic characteristics are accomplished by precisely tuning the threshold voltage using the proton-electron coupling effect, which is caused by proton migration inside the electrolyte. However, these synaptic characteristics are degraded because traps at the interface of channel/electrolyte disturb the proton–electron coupling effect. To minimize degradation, the oxygen plasma treatment is performed to reduce interface traps. As a result, symmetric weight updates and outstanding synaptic characteristics are achieved. Furthermore, high repeatability and long-term plasticity are observed at low operating power, which is essential for artificial synapses. Therefore, this study shows the progress of artificial synapses and proposes a promising method, a low-power neuromorphic system, to achieve high accuracy.

Original languageEnglish
Article number2100242
JournalSmall
Volume17
Issue number30
DOIs
Publication statusPublished - 2021 Jul 28

Keywords

  • artificial synapse
  • electrolyte-gated field-effect transistor
  • oxygen plasma treatment
  • proton–electron coupling
  • solid-state electrolyte

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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