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reconfigurable photovoltaic effect for optoelectronic artificial synapse based on ferroelectric p-n junction

Nano Research 2021年第11期14卷 4328-4335页

作者： Yanrong Wang Feng Wang Zhenxing Wang Junjun Wang Jia Yang Yuyu Yao Ningning Li Marshet Getaye Sendeku Xueying Zhan Congxin Shan Jun He CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing100190China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan430072China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Sino-Danish college University of Chinese Academy of SciencesBeijing100049China Sino-Danish Centre for Education and Research Beijing100049China School of Physics and Engineering Zhengzhou UniversityZhengzhou450001China

Neuromorphic machine vision has attracted extensive attention on wide fields.However,both current and emerging strategies still suffer from power/time inefficiency,and/or low compatibility,complex device structure.Here we demonstrate a driving-voltage-free optoelectronic synaptic device using non-volatile reconfigurable photovoltaic effect based on MoTe_(2)/α-In_(2)Se_(3) ferroelectric p-n junctions.This function comes from the non-volatile reconfigurable built-in potential in the p-n junction that is related to the ferroelectric polarization inα-In_(2)Se_(3).reconfigurable rectification behavior and photovoltaic effect are demonstrated firstly.Notably,the figure-of-merits for photovoltaic effect like photoelectrical conversion efficiency non-volatilely increases more than one order.Based on this,retina synapse-like vision functions are mimicked.Optoelectronic short-term and long-term plasticity,as well as basic neuromorphic learning and memory rule are achieved without applying driving voltage.Our work highlights the potential of ferroelectric p-n junctions for enhanced solar cell and low-power optoelectronic synaptic device for neuromorphic machine vision.

关键词： ferroelectric p-n junction reconfigurable rectification reconfigurable PV effect optoelectronic synaptic devices

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