Cheng Yankun, Zhang Junchao, Lin Ya, Wang Zhongqiang, Shan Xuanyu, Tao Ye, Zhao Xiaoning, Xu Haiyang, Liu Yichun
Key Laboratory for UV Light-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun, 130024, P. R. China.
Adv Sci (Weinh). 2025 Jun;12(22):e2417461. doi: 10.1002/advs.202417461. Epub 2025 Apr 7.
Visual adaptation allows organisms to effectively analyze visual information in varying light conditions by autonomously adjusting photosensitivity, which is essential for the visual system to perform accurate perception in complex environments. In order to realistically implement the functionality of the visual system, the exploration of bioinspired electronics with adaptive capability is highly desired. Herein, a self-powered optoelectronic memristor based on ZnO/WO heterojunction is developed, which can exhibit the visual adaptation functions of desensitization and Weber's law. These functions are achieved through the coupling of the photovoltaic effect with electron trapping in the space charge region of the heterojunction. Furthermore, a bioinspired visual adaptive neuron has been constructed, comprising an optoelectronic memristor and a NbO-based threshold switching memory, capable of directly converting constant light stimuli into dynamic spike trains. Finally, the adaptive image preprocessing is realized, which promotes the improvement of the object recognition accuracy during the overexposed image recognition process. This study offers a novel approach to developing biologically plausible visual adaptation, fostering the future progress of dynamic neuromorphic visual systems.
视觉适应使生物体能够通过自主调节光敏性，在不同光照条件下有效地分析视觉信息，这对于视觉系统在复杂环境中进行准确感知至关重要。为了切实实现视觉系统的功能，人们迫切希望探索具有自适应能力的仿生电子器件。在此，开发了一种基于ZnO/WO异质结的自供电光电忆阻器，它能够展现出脱敏和韦伯定律等视觉适应功能。这些功能是通过异质结空间电荷区中光伏效应与电子俘获的耦合来实现的。此外，构建了一种仿生视觉自适应神经元，它由一个光电忆阻器和一个基于NbO的阈值开关存储器组成，能够将恒定光刺激直接转换为动态脉冲序列。最后，实现了自适应图像预处理，这促进了过曝光图像识别过程中目标识别准确率的提高。这项研究为开发具有生物学合理性的视觉适应提供了一种新方法，推动了动态神经形态视觉系统的未来发展。
