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Coexistance of the Negative Photoconductance Effect and Analogue Switching Memory in the CuPc Organic Memristor for Neuromorphic Vision Computing

  • Changrong Liao
    Changrong Liao
    School of Electronic Information and Electrical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, People’s Republic of China
  • Dong Liu
    Dong Liu
    School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
    More by Dong Liu
  • Zheng Liu
    Zheng Liu
    College of Artificial Intelligence, Southwest University, Chongqing 400715, People’s Republic of China
    More by Zheng Liu
  • Jinchengyan Wang
    Jinchengyan Wang
    College of Artificial Intelligence, Southwest University, Chongqing 400715, People’s Republic of China
  • Xuesen Xie
    Xuesen Xie
    College of Artificial Intelligence, Southwest University, Chongqing 400715, People’s Republic of China
    More by Xuesen Xie
  • Jie Li*
    Jie Li
    College of Artificial Intelligence, Southwest University, Chongqing 400715, People’s Republic of China
    *E-mail: [email protected]
    More by Jie Li
  • , and 
  • Guangdong Zhou*
    Guangdong Zhou
    College of Artificial Intelligence, Southwest University, Chongqing 400715, People’s Republic of China
    *E-mail: [email protected]
Cite this: J. Phys. Chem. Lett. 2024, 15, 23, 6230–6236
Publication Date (Web):June 5, 2024
https://doi.org/10.1021/acs.jpclett.4c01071
Copyright © 2024 American Chemical Society

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    A bioinspired in-sensing computing paradigm using emerging photoelectronic memristors pursues multifunctionality with low power consumption and high efficiency for processing large amounts of sensing information. An organic semiconductor memristor strategy based on the CuPc functional layer integrates a negative photoconductance (NPC) effect and an analogue switching memory (ASM) effect in the same pixel. The NPC effect, present in the pure capacitance state at low bias voltage, provides high-performance short/long-term synaptic plasticity modulable by light pulse parameters. The interface charge effect along with defeat site trapping and detrapping is responsible for the pure capacitance effect and the NPC effect, with electron tunneling and electric-field-driven band dynamics responsible for ASM. This work reveals an organic memristor approach for hardware implementation of a neuromorphic vision computing system, emulating retinal bipolar cells via light-dominated NPC and electrically induced ASM with stable, tunable conductance states.

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