期刊
ADVANCED MATERIALS
卷 30, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800195
关键词
2D van der Waals crystals; biorealistic synaptic plasticity; diffusive dynamics; ionic gating; neuromorphic computing
类别
资金
- National Key R&D Program of China [2017YFA0207600]
- Beijing Municipal Science & Technology Commission Program [Z161100000216148]
- National Natural Science Foundation of China [61674006, 61421005, 11604064]
- 1000 Youth Talents Program of China
Neuromorphic computing represents an innovative technology that can perform intelligent and energy-efficient computation, whereas construction of neuromorphic systems requires biorealistic synaptic elements with rich dynamics that can be tuned based on a robust mechanism. Here, an ionic-gating-modulated synaptic transistor based on layered crystals of transitional metal dichalcogenides and phosphorus trichalcogenides is demonstrated, which produce a diversity of short-term and long-term plasticity including excitatory postsynaptic current, paired pulse facilitation, spiking-rate-dependent plasticity, dynamic filtering, etc., with remarkable linearity and ultralow energy consumption of approximate to 30 fJ per spike. Detailed transmission electron microscopy characterization and ab initio calculation reveal two-stage ionic gating effects, namely, surface adsorption and internal intercalation in the channel medium, causing different poststimulation diffusive dynamics and thus accounting for the observed short-term and long-term plasticity, respectively. The synaptic activity can therefore be effectively manipulated by tailoring the ionic gating and consequent diffusion dynamics with varied thickness and structure of the van der Waals material as well as the number, duration, rate, and polarity of gate stimulations, making the present synaptic transistors intriguing candidates for low-power neuromorphic systems.
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