Guo Ziyi, Zhang Junyao, Yang Ben, Li Li, Liu Xu, Xu Yutong, Wu Yue, Guo Pu, Sun Tongrui, Dai Shilei, Liang Haixia, Wang Jun, Zou Yidong, Xiong Lize, Huang Jia
School of Materials Science and Engineering, Tongji University, Shanghai, 201804, P. R. China.
Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation, Shanghai Fourth People's Hospital Affiliated to Tongji University, Tongji University, Shanghai, 200434, P. R. China.
Adv Mater. 2024 Mar;36(13):e2310155. doi: 10.1002/adma.202310155. Epub 2023 Dec 22.
Organic optoelectronic synaptic devices that can reliably operate in high-temperature environments (i.e., beyond 121°C) or remain stable after high-temperature treatments have significant potential in biomedical electronics and bionic robotic engineering. However, it is challenging to acquire this type of organic devices considering the thermal instability of conventional organic materials and the degradation of photoresponse mechanisms at high temperatures. Here, high-temperature synaptic phototransistors (HTSPs) based on thermally stable semiconductor polymer blends as the photosensitive layer are developed, successfully simulating fundamental optical-modulated synaptic characteristics at a wide operating temperature range from room temperature to 220°C. Robust optoelectronic performance can be observed in HTSPs even after experiencing 750 h of the double 85 testing due to the enhanced operational reliability. Using HTSPs, Morse-code optical decoding scheme and the visual object recognition capability are also verified at elevated temperatures. Furthermore, flexible HTSPs are fabricated, demonstrating an ultralow power consumption of 12.3 aJ per synaptic event at a low operating voltage of -0.05 mV. Overall, the conundrum of achieving reliable optical-modulated neuromorphic applications while balancing low power consumption can be effectively addressed. This research opens up a simple but effective avenue for the development of high-temperature and energy-efficient wearable optoelectronic devices in neuromorphic computing applications.
能够在高温环境（即超过121°C）下可靠运行或在高温处理后保持稳定的有机光电子突触器件在生物医学电子学和仿生机器人工程中具有巨大潜力。然而，考虑到传统有机材料的热不稳定性以及高温下光响应机制的退化，获取这类有机器件具有挑战性。在此，基于热稳定半导体聚合物共混物作为光敏层的高温突触光电晶体管（HTSP）被开发出来，成功地在从室温到220°C的宽工作温度范围内模拟了基本的光调制突触特性。由于操作可靠性增强，即使在经历750小时的双85测试后，HTSP中仍能观察到稳健的光电性能。使用HTSP，莫尔斯码光学解码方案和视觉目标识别能力也在高温下得到了验证。此外，还制造了柔性HTSP，在-0.05 mV的低工作电压下，每个突触事件的功耗低至12.3 aJ。总体而言，在平衡低功耗的同时实现可靠的光调制神经形态应用这一难题能够得到有效解决。这项研究为在神经形态计算应用中开发高温且节能的可穿戴光电子器件开辟了一条简单而有效的途径。
