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Research Article

Air-stable synaptic devices based on bismuth triiodide and carbon nanotubes

Dandan Hao1, Junyao Zhang1, Li Li1, Ben Yang1, Pu Guo1, Shiqi Zhang1, Jia Huang2,1( )
Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Frontiers Science Center for Intelligent Autonomous Systems, Tongji University, Shanghai 201804, 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
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Graphical Abstract

BiI3/SWCNTs composite layer is firstly used as active material to fabricate synaptic devices, whichexhibit a unique wavelength-independent photo-response and excellent air-stability.

Abstract

Artificial synaptic devices with the functions of emulating important biological synaptic behaviors are playing an increasingly important role in the development of neuromorphic computing systems. Single-walled carbon nanotubes (SWCNTs) with excellent electrical properties and high stability have been studied as active materials for synaptic devices. However, the performance of optical synaptic devices (OSDs) based on pure SWCNTs is limited by the weak light absorption property. Herein, bismuth triiodide (BiI3), an environmentally stable and friendly optoelectronic material, is firstly combined with SWCNTs to fabricate OSDs with decent properties of perceiving and memorizing optical information. The OSDs can exhibit typical synaptic behaviors including excitatory postsynaptic current, paired-pulse facilitation, and short/long-term memory. Distinctively, the photo-response of the OSD is independent of pulse light wavelength in the range of 365 to 650 nm, different from most of the previously reported OSDs, which usually have wavelength-dependent photo-response. Temperature- dependent photo-response behaviors of the devices are investigated. Importantly, the OSD without encapsulation holds good excitatory post-synaptic current (EPSC) behavior after being stored in the ambient environment for 170 days, indicating reliable environmental stability. Furthermore, an OSD array with nine synaptic devices is employed to mimic the human visual perception and memory functions. These results suggest the feasibility of BiI3/SWCNTs-based OSDs for the simulation of human visual memory.

Keywords

semiconducting single-walled carbon nanotubesbismuth triiodideoptical synaptic devicesstabilityhuman visual memory

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Nano Research
Volume 15 Issue 6,
June 2022
Pages 5435-5442
DOI: 10.1007/s12274-022-4132-x
Cite this article:
Hao D, Zhang J, Li L, et al. Air-stable synaptic devices based on bismuth triiodide and carbon nanotubes. Nano Research, 2022, 15(6): 5435-5442. https://doi.org/10.1007/s12274-022-4132-x
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Received: 03 November 2021
Revised: 14 December 2021
Accepted: 02 January 2022
Published: 10 March 2022
© Tsinghua University Press 2022
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