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journal article·2024-06Open access

Optically Tunable Electrical Oscillations in Oxide‐Based Memristors for Neuromorphic Computing

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

Advanced Materials· Volume 36· Issue 25
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Source abstract

Abstract

Abstract The application of hardware‐based neural networks can be enhanced by integrating sensory neurons and synapses that enable direct input from external stimuli. This work reports direct optical control of an oscillatory neuron based on volatile threshold switching in V3O5. 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, it is shown 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 photoconductive and bolometric characteristics of V3O5, which eventually affects the oscillation dynamics. Furthermore, V3O5 is identified as a new bolometric material with a temperature coefficient of resistance (TCR) as high as −4.6% K−1 at 423 K. The utility of these devices is illustrated by demonstrating in‐sensor reservoir computing with reduced computational effort and an optical encoding layer for spiking neural network (SNN), respectively, using a simulated array of devices.
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Research context

OpenAlex topics: Advanced Memory and Neural Computing · Neural Networks and Reservoir Computing · Transition Metal Oxide Nanomaterials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical Electronic and Computer Engineering The University of Western Australia 35 Stirling Highway Perth WA 6009 Australia

Department of Electronic Materials Engineering Research School of Physics The Australian National University Canberra ACT 2601 Australia

School of Photovoltaic and Renewable Energy Engineering University of New South Wales (UNSW Sydney) Kensington NSW 2052 Australia

Department of Physics Jahangirnagar Univeristy Savar Dhaka 1342 Bangladesh

Department of Electrical and Electronic Engineering the University of Hong Kong Pok Fu Lam Rd Hong Kong Island Hong Kong

Department of Physics University of Puerto Rico Mayaguez PR 00681 USA

Information Device Science Laboratory Nara Institute of Science and Technology (NAIST) Nara 630‐0192 Japan

Department of Electrical and Computer Engineering University of California Santa Cruz CA 95064 USA

John de Laeter Centre Curtin University Perth WA 6102 Australia

Research School of Chemistry The Australian National University Canberra ACT 2601 Australia

Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems Canberra ACT 2601 Australia

Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems, School of Physics University of Melbourne Melbourne Victoria 3010 Australia

Australian Research Council Centre of Excellence for Transformative Meta‐Optical Systems Perth WA 6009 Australia

Funding

Australian Research Council · National Science Foundation

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