Shimul Kanti Nath, Sujan Kumar Das, Sanjoy Kumar Nandi, Chen Xi, Camilo Verbel Marquez, Armando Rúa, Mutsunori Uenuma, Zhongrui Wang, Songqing Zhang, Rui-Jie Zhu, Jason Eshraghian, Xiao Sun, Teng Lu, Yue Bian, Nitu Syed, Wenwu Pan, Han Wang, Wen Lei, Lan Fu, Lorenzo Faraone, Yun Liu, Robert G Elliman
The application of hardware-based neural networks can be enhanced by integrating sensory neurons and synapses that enable direct input from external stimuli. Here, we report direct optical control of an oscillatory neuron based on volatile threshold switching in V3 O5 . The devices exhibit electroforming-free operation with switching parameters that can be tuned by optical illumination. Using temperature-dependent electrical measurements, conductive atomic force microscopy (C-AFM), in-situ thermal imaging, and lumped element modelling, we show that the changes in switching parameters, including threshold and hold voltages, arise from overall conductivity increase of the oxide film due to the contribution of both photo-conductive and bolometric characteristics of V3 O5 , which eventually affects the oscillation dynamics...
March 22, 2024: Advanced Materials