journal article·2021-10-27

Optically Modulated HfS2-Based Synapses for Artificial Vision Systems

Hao Xiong, Liping Xu, Caifang Gao, Qing Zhang, Menghan Deng, Qiangfei Wang, Jinzhong Zhang, Dirk Fuchs, Wenwu Li, Anyang Cui, Liyan Shang, Kai Jiang, Zhigao Hu, Junhao Chu

ACS Applied Materials & Interfaces· Volume 13· Issue 42
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Abstract

The simulation of human brain neurons by synaptic devices could be an effective strategy to break through the notorious “von Neumann Bottleneck” and “Memory Wall”. Herein, opto-electronic synapses based on layered hafnium disulfide (HfS2) transistors have been investigated. The basic functions of biological synapses are realized and optimized by modifying pulsed light conditions. Furthermore, 2 × 2 pixel imaging chips have also been developed. Two-pixel visual information is illuminated on diagonal pixels of the imaging array by applying light pulses (λ = 405 nm) with different pulse frequencies, mimicking short-term memory and long-term memory characteristics of the human vision system. In addition, an optically/electrically driven neuromorphic computation is demonstrated by machine learning to classify hand-written numbers with an accuracy of about 88.5%. This work will be an important step toward an artificial neural network comprising neuromorphic vision sensing and training functions.
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Research context

OpenAlex topics: Advanced Memory and Neural Computing · Photoreceptor and optogenetics research · Neuroscience and Neural Engineering

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

Affiliations

Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China

Center for Advanced Electronic Materials and Devices, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Chongqing Key Laboratory of Precision Optics, Chongqing Institute of East China Normal University, Chongqing 401123, China

Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Karlsruhe 75021, Germany

Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China

Shanghai Institute of Intelligent Electronics & Systems, Fudan University, Shanghai 200433, China

Funding

Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · Science and Technology Commission of Shanghai Municipality · National Natural Science Foundation of China · Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning

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