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

16 Citations (Scopus)

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

Bibliographical note

Funding Information:
This research was supported in part by the Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2016M3A7B4910426), and in part by the Basic Science Research Program within the Ministry of Science, ICT, and Future Planning through the National Research Foundation of Korea under Grant 2020R1A2C2004029, and in part by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT for Original Technology Program (No. 2020M3F3A2A01082329).

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Keywords

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

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • General Chemistry
  • General Materials Science
  • Biotechnology
  • Biomaterials

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