A\nSunlight-Interference-Immune Artificial Optoelectronic\nSynaptic Device for Visual Perception and Memory

The\nartificial photoelectric synaptic devices integrating optical\nsignal response and data processing functions enable the simulation\nof the human visual system. However, the optical modulation behavior\nof photoelectronic synaptic devices is susceptible to interference\nfrom sunlight background, significantly hindering their applications\nin optical modulation. To address this issue, a Ni/AlYN/ITO structure\nfor sunlight-interference-free artificial synaptic memristor was designed\nand fabricated, and the application in photoelectric modulation was\ndemonstrated. Solar-blind ultraviolet light with low background noise\nand high security is introduced as the optical stimuli signal. Various\nbiological synaptic functions, including short-term and long-term\nsynaptic plasticity, have been successfully simulated under the modulation\nof optical and electrical signals. Furthermore, it emulates the human\nvisual system’s perception and memory functions, exhibiting\nnotable memory retention (over 300 s) and capacity (up to 5.6 times\nafter 5 cycles). Notably, the device’s output current remains\nunaffected by the optical signal interference. This artificial photoelectric\nsynaptic device not only extends the potential for human visual perception\nin the solar-blind ultraviolet region, but also facilitates the integration\nof solar-blind optical communication and brain-inspired computing.\nThis advancement is expected to enable information reception, transmission,\nand processing resistant to visible light interference, thereby creating\nand boosting applications in secure optical communication.