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Vol. 16 (2024)

Optoelectronic Synapses Based on MXene/Violet Phosphorus van der Waals Heterojunctions for Visual-Olfactory Crossmodal Perception

https://doi.org/10.1007/s40820-024-01330-7
Hailong Ma
Center for Advancing Materials Performance From the Nanoscale (CAMP‑Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Huajing Fang
Center for Advancing Materials Performance From the Nanoscale (CAMP‑Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Xinxing Xie
Center for Advancing Materials Performance From the Nanoscale (CAMP‑Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Yanming Liu
Institute of Microelectronics and Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, People’s Republic of China
He Tian
Institute of Microelectronics and Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing 100084, People’s Republic of China
Yang Chai
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, People’s Republic of China

Corresponding Author: Yang Chai

ychai@polyu.edu.hk

Nano-Micro Letters, Vol. 16 (2024), Article Number: 104

Abstract

The crossmodal interaction of different senses, which is an important basis for learning and memory in the human brain, is highly desired to be mimicked at the device level for developing neuromorphic crossmodal perception, but related researches are scarce. Here, we demonstrate an optoelectronic synapse for vision-olfactory crossmodal perception based on MXene/violet phosphorus (VP) van der Waals heterojunctions. Benefiting from the efficient separation and transport of photogenerated carriers facilitated by conductive MXene, the photoelectric responsivity of VP is dramatically enhanced by 7 orders of magnitude, reaching up to 7.7 A W−1. Excited by ultraviolet light, multiple synaptic functions, including excitatory postsynaptic currents, paired-pulse facilitation, short/long-term plasticity and “learning-experience” behavior, were demonstrated with a low power consumption. Furthermore, the proposed optoelectronic synapse exhibits distinct synaptic behaviors in different gas environments, enabling it to simulate the interaction of visual and olfactory information for crossmodal perception. This work demonstrates the great potential of VP in optoelectronics and provides a promising platform for applications such as virtual reality and neurorobotics.


Highlights:
1 The photoelectric response of violet phosphorus (VP) is significantly enhanced by the MXene/VP van der Waals heterojunctions and the highest photoresponsivity of VP is demonstrated.
2 The first VP-based optoelectronic synapse with essential synaptic behaviours is demonstrated.
3 Proof-of-concept visual-olfactory crossmodal perception based on MXene/VP optoelectronic synapses is explored to mimic neuromorphic vision with multi-sensory interactions.

Keywords

Violet phosphorus MXene Van der Waals heterojunctions Optoelectronic synapses Crossmodal perception
Ma, Hailong, Huajing Fang, Xinxing Xie, Yanming Liu, He Tian, and Yang Chai. 2024. “Optoelectronic Synapses Based on MXene/Violet Phosphorus Van Der Waals Heterojunctions for Visual-Olfactory Crossmodal Perception”. Nano-Micro Letters 16 (February):104. https://doi.org/10.1007/s40820-024-01330-7.
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