Sodium-based nano-ionic synaptic transistor with improved retention characteristics

We propose an all-solid-state Na ion-based synaptic transistor (NST) to overcome the low retention problem of the Li ion-based synaptic transistor (LST). Through our analysis, it was found that the retention instability in an ionic synaptic transistor originated from its high ionic diffusivity. As c...

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Bibliographic Details
Published in:Nanotechnology 2020-11, Vol.31 (45), p.455204-455204
Main Authors: Lee, Kyumin, Lee, Jongwon, Nikam, Revannath Dnyandeo, Heo, Seongjae, Hwang, Hyunsang
Format: Article
Language:English
Subjects:
ionic diffusivity
Na ion-based synaptic transistor
neuromorphic device
state retention
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Summary:We propose an all-solid-state Na ion-based synaptic transistor (NST) to overcome the low retention problem of the Li ion-based synaptic transistor (LST). Through our analysis, it was found that the retention instability in an ionic synaptic transistor originated from its high ionic diffusivity. As confirmed by cyclic voltammetry analysis, Na ions have a lower ionic diffusivity than Li ions in the WOx layer. The state retention of NST was found to be improved to 20 times that of LST. Furthermore, near-ideal synaptic behaviors, such as linear weight update and linear I-V characteristics, were also obtained by material engineering.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/abaa0e