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Research Article

Monolayer molecular crystals for low-energy consumption optical synaptic transistors

Zhekun Hua1,§, Ben Yang1,§, Junyao Zhang1, Dandan Hao1, Pu Guo1, Jie Liu2( ), Lang Jiang2( ), Jia Huang3,1( )
Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Frontiers Science Center for Intelligent Autonomous Systems, Tongji University, Shanghai 201804, China
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital Affiliated to Tongji University, School of Materials Science and Engineering, Tongji University, Shanghai 200434, China

§ Zhekun Hua and Ben Yang contributed equally to this work.

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Graphical Abstract

This work reports the synaptic transistor based on HTEB monolayer molecular crystals and the synaptic behaviors can be explained by oxygen related energy levels.

Abstract

Artificial synaptic devices hold great potential in building neuromorphic computers. Due to the unique morphological features, two-dimensional organic semiconductors at the monolayer limit show interesting properties when acting as the active layers for organic field-effect transistors. Here, organic synaptic transistors are prepared with 1,4-bis ((5’-hexyl-2,2’-bithiophen-5-yl) ethyl) benzene (HTEB) monolayer molecular crystals. Functions similar to biological synapses, including excitatory postsynaptic current (EPSC), pair-pulse facilitation, and short/long-term memory, have been realized. The synaptic device achieves the minimum power consumption of 4.29 fJ at low drain voltage of −0.01 V. Moreover, the HTEB synaptic device exhibits excellent long-term memory with 109 s EPSC estimated retention time. Brain-like functions such as dynamic learning-forgetting process and visual noise reduction are demonstrated by nine devices. The unique morphological features of the monolayer molecular semiconductors help to reveal the device working mechanism, and the synaptic behaviors of the devices can be attributed to oxygen induced energy level. This work shows the potential of artificial neuroelectronic devices based on organic monolayer molecular crystals.

Keywords

monolayer molecular crystalssynaptic devicesorganic field-effect transistorsoptical synaptic transistors

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Nano Research
Volume 15 Issue 8,
August 2022
Pages 7639-7645
DOI: 10.1007/s12274-022-4372-9
Cite this article:
Hua Z, Yang B, Zhang J, et al. Monolayer molecular crystals for low-energy consumption optical synaptic transistors. Nano Research, 2022, 15(8): 7639-7645. https://doi.org/10.1007/s12274-022-4372-9
Topics:
Organic semiconductor materials

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Received: 08 January 2022
Revised: 16 March 2022
Accepted: 29 March 2022
Published: 07 June 2022
© Tsinghua University Press 2022
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