Artificial Visual Systems With Tunable Photoconductivity Based on Organic Molecule-Nanowire Heterojunctions

Pengshan Xie, Xu Chen, Zixin Zeng, Wei Wang, You Meng, Zhengxun Lai, Quan Quan, Dengji Li, Weijun Wang, Xiuming Bu, Sai Wing Tsang, Sen Po Yip, Jia Sun, Johnny C. Ho

研究成果: ジャーナルへの寄稿学術誌査読

14 被引用数 (Scopus)

抄録

The visual system, one of the most crucial units of the human perception system, combines the functions of multi-wavelength signal detection and data processing. Herein, the large-scale artificial synaptic device arrays based on the organic molecule-nanowire heterojunctions with tunable photoconductivity are proposed and demonstrated. The organic thin films of p-type 2,7-dioctyl[1]benzothieno[3,2-b][1] benzothiophene (C8-BTBT) or n-type phenyl-C61-butyric acid methyl ester (PC61BM) are used to wrap the InGaAs nanowire parallel arrays to configure two different type-I heterojunctions, respectively. Due to the difference in carrier injection, persistent negative photoconductivity (NPC) or positive photoconductivity (PPC) are achieved in these heterojunctions. The irradiation with different wavelengths (solar-blind to visible ranges) can stimulate the heterojunction devices, effectively mimicking the synaptic behaviors with two different photoconductivities. The long-term and multi-state light memory are also realized through synergistic photoelectric modulation. Notably, the arrays with different photoconductivities are adopted to build the hardware kernel for the visual system. Due to the tunable photoconductivity and response to multiple wavelengths, the recognition rate of neural networks can reach 100% with lower complexity and power consumption. Evidently, these photosynaptic devices are illustrated with retina-like behaviors and capabilities for large-area integration, which reveals their promising potential for artificial visual systems.

本文言語英語
論文番号2209091
ジャーナルAdvanced Functional Materials
33
4
DOI
出版ステータス出版済み - 1月 20 2023

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 化学一般
  • 凝縮系物理学
  • 材料科学一般
  • 電気化学
  • 生体材料

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