Multifunctional Optoelectronic Synapse Based on Ferroelectric Van der Waals Heterostructure for Emulating the Entire Human Visual System

作     者：Guo, Feng Song, Menglin Wong, Man-Chung Ding, Ran Io, Weng Fu Pang, Sin-Yi Jie, Wenjing Hao, Jianhua 

作者机构：Hong Kong Polytech Univ Dept Appl Phys Hung Hom Kowloon Hong Kong 999077 Peoples R China Sichuan Normal Univ Coll Chem & Mat Sci Chengdu 610066 Peoples R China 

出 版 物：《ADVANCED FUNCTIONAL MATERIALS》 (实用新材料)

年 卷 期：2022年第32卷第6期

页      面：2108014-2108014页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Research Grants Council of Hong Kong (GRF) [PolyU 153033/17P] PolyU Postdoctoral Fellowships Scheme [YW4N] National Natural Science Foundation of China Sichuan Youth Science and Technology Foundation [2019JDJQ0052] 

主　　题：artificial visual systems ferroelectric 2D materials logic functions memory optoelectronic synapses van der Waals heterostructures 

摘      要：The development of optoelectronic synapses can provide an important breakthrough toward creating a sophisticated and adaptable artificial visual system analogous to that of humans. However, it remains a great challenge to implement the various functions of the biological visual neuromorphic system at the single device level. Intriguingly, 2D van der Waals (vdW) heterostructure may offer a platform to address the issue. Here, a novel multifunctional synaptic device based on ferroelectric alpha-In2Se3/GaSe vdW heterojunction is proposed to emulate the entire biological visual system. Essential synaptic behaviors are observed in response to light and electrical stimuli;additionally, the retina-like selectivity for light wavelengths and the achievement of Pavlov s dog experiment demonstrate the device s capacity for processing complex electrical and optical inputs. Beyond the optoelectronic synaptic behaviors, the device incorporates memory and logic functions analogous to those in the brain s visual cortex. The results of artificial neural network simulations show that the vdW heterojunction-based device is completely capable of performing logic operations and recognizing images with a high degree of accuracy. The study indicates that versatile devices with a rationally designed construction have great potential for efficiently processing complex visual information and may simplify the design of artificial visual systems.