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Open AccessArticle

Artificial 2D van der Waals Synapse Devices via Interfacial Engineering for Neuromorphic Systems

1
Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk 28644, Korea
2
Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Sungsan-gu, Changwon, Gyeongnam 51508, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 88; https://doi.org/10.3390/nano10010088
Received: 22 November 2019 / Revised: 28 December 2019 / Accepted: 31 December 2019 / Published: 2 January 2020
(This article belongs to the Special Issue Preparation and Properties of 2D Materials)
Despite extensive investigations of a wide variety of artificial synapse devices aimed at realizing a neuromorphic hardware system, the identification of a physical parameter that modulates synaptic plasticity is still required. In this context, a novel two-dimensional architecture consisting of a NbSe2/WSe2/Nb2O5 heterostructure placed on an SiO2/p+ Si substrate was designed to overcome the limitations of the conventional silicon-based complementary metal-oxide semiconductor technology. NbSe2, WSe2, and Nb2O5 were used as the metal electrode, active channel, and conductance-modulating layer, respectively. Interestingly, it was found that the post-synaptic current was successfully modulated by the thickness of the interlayer Nb2O5, with a thicker interlayer inducing a higher synapse spike current and a stronger interaction in the sequential pulse mode. Introduction of the Nb2O5 interlayer can facilitate the realization of reliable and controllable synaptic devices for brain-inspired integrated neuromorphic systems. View Full-Text
Keywords: 2D heterostructure; WSe2; NbSe2; Nb2O5 interlayer; synapse device; neuromorphic system 2D heterostructure; WSe2; NbSe2; Nb2O5 interlayer; synapse device; neuromorphic system
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Park, W.; Jang, H.Y.; Nam, J.H.; Kwon, J.-D.; Cho, B.; Kim, Y. Artificial 2D van der Waals Synapse Devices via Interfacial Engineering for Neuromorphic Systems. Nanomaterials 2020, 10, 88.

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