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Plasmonically engineered light-matter interactions in Au-nanoparticle/MoS2 heterostructures for artificial optoelectronic synapse

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Abstract

Optoelectronic synaptic elements are emerging functional devices for the vigorous development of advanced neuromorphic computing technology in the post-Moore era. However, optoelectronic devices based on transition metal dichalcogenides (TMDs) are limited to their poor mobilities and weak light-matter interactions, which still hardly exhibit superior device performances in the application of artificial synapses. Here, we demonstrate the successful fabrication of Au nanoparticle-coupled MoS2 heterostructures via chemical vapor deposition (CVD), where the light absorption of MoS2 is greatly enhanced and engineered by plasmonic effects. Hot electrons are excited from Au nanoparticles, and then injected into MoS2 semiconductors under the light illumination. The plasmonically-engineered photo-gating effect at the metal-semiconductor junction is demonstrated to create optoelectronic devices with excellent synaptic behaviors, especially in ultra-sensitive excitatory postsynaptic current (EPSC, 9.6 × 10−3 nA@3.4 nW·cm−2), ultralow energy consumption (34.7 pJ), long-state retention time (> 1,000 s), and tunable synaptic plasticity transitions. The material system of Au-nanoparticles coupled TMDs presents unique advantages for building artificial synapses, which may lead the future development of neuromorphic electronics in optical information sensing and learning.

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Acknowledgements

We thank Prof. Feng Lin for his efforts on FDTD simulations. This work is supported by the National Natural Science Foundation of China (Nos. 92163135, 11904098, 51972105, U19A2090, and 62090035), Hunan Provincial Natural Science Foundation of China (No. 2019JJ30004), Key Program of the Hunan Provincial Science and Technology Department (Nos. 2019XK2001 and 2020XK2001). This work is also supported by State Key Laboratory of Artificial Microstructure & Mesoscopic Physics.

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  1. Zhuoran Luo, Yunfei Xie, and Ziwei Li contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha, 410082, China

    Zhuoran Luo, Yunfei Xie, Ziwei Li, Yajuan Wang, Lihui Li, Ziyu Luo, Chenguang Zhu, Xin Yang, Ming Huang, Jianhua Huang, Delang Liang, Xiaoli Zhu, Dong Li & Anlian Pan

  2. State Key Laboratory of Artificial Microstructure & Mesoscopic Physics, School of Physics, Peking University, Beijing, 100084, China

    Ziwei Li

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  1. Zhuoran Luo
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Plasmonically engineered light-matter interactions in Au-nanoparticle/MoS2 heterostructures for artificial optoelectronic synapse

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Luo, Z., Xie, Y., Li, Z. et al. Plasmonically engineered light-matter interactions in Au-nanoparticle/MoS2 heterostructures for artificial optoelectronic synapse. Nano Res. 15, 3539–3547 (2022). https://doi.org/10.1007/s12274-021-3875-0

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