Flexible Optical Synapses Based on InSe/MoS Heterojunctions for Artificial Vision Systems in the Near-Infrared Range.

Journal: ACS applied materials & interfaces
Published Date: Dec 21, 2022

Abstract

Near-infrared (NIR) synaptic devices integrate NIR optical sensitivity and synaptic plasticity, emulating the basic biomimetic function of the human visual system and showing great potential in NIR artificial vision systems. However, the lack of semiconductor materials with appropriate band gaps for NIR photodetection and effective strategies for fabricating devices with synaptic behaviors limit the further development of NIR synaptic devices. Here, a two-terminal NIR synaptic device consisting of the InSe/MoS heterojunction has been constructed, and it exhibits fundamental synaptic functions. The reduced band gap and potential barrier of InSe/MoS heterojunctions are essential for NIR synaptic plasticity. In addition, the NIR synaptic properties of InSe/MoS heterojunctions under strain have been studied systematically. The ΔEPSC of the InSe/MoS synaptic device can be improved from 38.4% under no strain to 49.0% under a 0.54% strain with a 1060 nm illumination for 1 s at 100 mV. Furthermore, the artificial NIR vision system consisting of a 10 × 10 InSe/MoS device array has been fabricated, exhibiting image sensing, learning, and storage functions under NIR illumination. This research provides new ideas for the design of flexible NIR synaptic devices based on 2D materials and presents many opportunities in artificial intelligence and NIR vision systems.

Authors

  • Yunxia Hu
    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150080, China.
  • Hongying Yang
    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150080, China.
  • Jingtao Huang
    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150080, China.
  • Xin Zhang
    First Department of Infectious Diseases, The First Affiliated Hospital of China Medical University, Shenyang, China.
  • Biying Tan
    MOE Key Lab of Micro-System and Micro-Structures Manufacturing, Harbin Institute of Technology, Harbin150080, China.
  • Huiming Shang
    MOE Key Lab of Micro-System and Micro-Structures Manufacturing, Harbin Institute of Technology, Harbin150080, China.
  • Shichao Zhang
    Department of Urology, Tianjin Institute of Urology, The Second Hospital of Tianjin Medical University, Tianjin, China.
  • Wei Feng
    Department of Epidemiology and Health Statistics, School of Public Health, Capital Medical University, You'anmenwai, Xitoutiao No.10, Beijing, P. R. China.
  • Jingchuan Zhu
    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150080, China.
  • Jia Zhang
    Department of Geriatrics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
  • Yong Shuai
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin150001, China.
  • Dechang Jia
    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150080, China.
  • Yu Zhou
    Department of Biospectroscopy, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Dortmund, Germany.
  • PingAn Hu
    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin150080, China.

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