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Highly Stable Artificial Synapse Consisting of Low-Surface Defect van der Waals and Self-Assembled Materials
journal contribution
posted on 2020-08-12, 14:50 authored by Seyong Oh, Sooyoung Jung, Muhammad Hasnain Ali, Jeong-Hoon Kim, Hyeongjun Kim, Jin-Hong ParkThe long-term plasticity of biological
synapses was successfully emulated in an artificial synapse fabricated
by combining low-surface defect van der Waals (vdW) and self-assembled
(SA) materials. The synaptic operation could be achieved by facilitating
hole trapping and releasing only via the amine (NH2) functional
groups in 3-aminopropyltriethoxysilane, which consequently induced
a gradual conductance change in the WSe2 channel. The vdW–SA
synaptic device exhibited extremely stable long-term potentiation/depression
(LTP/LTD) characteristics; its dynamic range and nonlinearity reproduced
near 100 and 3.13/–6.53 (for LTP/LTD) with relative standard
deviations (RSDs) below 2%. Furthermore, after conducting training
and recognition tasks for the Modified National Institute of Standard
and Technology (MNIST) digit patterns, we verified that the maximum
recognition rate was 78.3%, and especially, its RSD was as low as
0.32% over several training/recognition cycles. This study provides
a background for future research on advanced artificial synapses based
on vdW and organic materials.