Volume 21, Issue 9 2411129
Research Article

All-Inorganic Lead-Free Cs₂AgBiBr₆/ZnO Artificial Retina Synapse Based on Photoelectric Synergistic Dual-Mechanism for Neuromorphic Computing

Zhenpeng Cheng

Zhenpeng Cheng

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Tianle Wang

Tianle Wang

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Junyan Zhu

Junyan Zhu

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Yaqi He

Yaqi He

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Shijie Liu

Shijie Liu

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Ming-Yu Li

Corresponding Author

Ming-Yu Li

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

E-mail: [email protected]; [email protected]; [email protected]

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Haifei Lu

Haifei Lu

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Xiaoyan Wen

Xiaoyan Wen

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

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Jihoon Lee

Jihoon Lee

Department of Electronic Engineering, College of Electronics and Information, Kwangwoon University, Nowon-gu, Seoul, 01897 Republic of Korea

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Sisi Liu

Corresponding Author

Sisi Liu

School of Physics and Mechanics, Wuhan University of Technology, Wuhan, 430070 China

E-mail: [email protected]; [email protected]; [email protected]

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Sui Mao

Corresponding Author

Sui Mao

Institute of Hybrid Materials, National Center of International Research for Hybrid Materials Technology, National Base of International Science & Technology Cooperation, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 China

E-mail: [email protected]; [email protected]; [email protected]

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First published: 02 February 2025
Citations: 1

Abstract

Adaptive learning capability of optoelectronic synaptic hardware holds promising application prospects in next generation artificial intelligence, and the development of biometric retina perception is sternly hampered by three crucial issues, including well-balance between excitatory and inhibitory, non-volatile multi-state storage, and optimal energy consumption. In this work, a novel Cs2AgBiBr6/ZnO non-volatile optoelectronic synapse is proposed and successfully programmed with optical excitatory and electronic inhibitory in the light of dual-mechanism: Lead-free perovskite Cs2AgBiBr6 guarantees abundant photogenerated carrier concentration, and the process of carrier capture and release occurs in ZnO layer, which can collaboratively modulate various synaptic plasticity behaviors depending on distinct stimulus. Consequently, multi-bit storage is attained with the dual-mechanism non-volatile memory (DNVM) as a function of consecutive light spikes. The energy consumption of the DNVM is 1.85 nJ at a single light spike, and an ultra-low one of 13.8 fJ is triggered with a single electrical pulse, which approximatively meets the requirement of the biological synaptic event energy consumption. The performance of the DNVM is further evaluated with the Pavlov's classical conditioning experiment and visual hardware system, offering an exciting paradigm for implementing on-chip adaptive visual perception and neuromorphic computing.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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