Wang Yue, Wang Kun, Hu Xiangyu, Wang Ya'kun, Gao Wandong, Zhang Yiqiang, Liu Zhenghui, Zheng Yi, Xu Ke, Yang Deren, Pi Xiaodong
State Key Laboratory of Silicon Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang310027, China.
Institute of Advanced Semiconductors & Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices, Hangzhou Innovation Center, Zhejiang University, Hangzhou, Zhejiang311215, China.
ACS Nano. 2023 Feb 28;17(4):3696-3704. doi: 10.1021/acsnano.2c10816. Epub 2023 Feb 6.
Given the synergy of optogenetics and bioimaging in neuroscience, it is possible for light to simultaneously modulate and visualize synaptic events of optoelectronic synaptic devices, which are building blocks of a neuromorphic computing system with optoelectronic integration. Here we demonstrate the realization of the simultaneous modulation and visualization of synaptic events by using optically stimulated synaptic devices based on the heterostructure of fluorescent silicon quantum dots (Si QDs) and monolayer molybdenum disulfide (MoS). The charge-transfer-enabled photogating effect of the Si QDs/MoS heterostructure leads to the nonvolatility of the synaptic devices, which exhibit important synaptic functionalities and synchronous fluorescence upon optical stimulation. An array of the Si QDs/MoS optoelectronic synaptic devices is well-employed to mimic robust neural population coding. Defective devices in this array may be pinpointed by the absence of their fluorescence. This work has an important implication for the development of synaptic devices facilitating the system-level diagnosis and device-level positioning of a neuromorphic computing system.
鉴于光遗传学与生物成像在神经科学中的协同作用，光有可能同时调制和可视化光电突触器件的突触事件，这些器件是具有光电集成的神经形态计算系统的基本组成部分。在此，我们展示了通过使用基于荧光硅量子点（Si QDs）和单层二硫化钼（MoS）异质结构的光刺激突触器件来实现突触事件的同时调制和可视化。Si QDs/MoS异质结构的电荷转移光门效应导致突触器件具有非易失性，该器件在光刺激时表现出重要的突触功能和同步荧光。Si QDs/MoS光电突触器件阵列被很好地用于模拟强大的神经群体编码。该阵列中的有缺陷器件可通过其荧光缺失来精确识别。这项工作对促进神经形态计算系统的系统级诊断和器件级定位的突触器件的开发具有重要意义。
