无机材料学报2026，Vol.41Issue(6)：795-804,10.DOI:10.15541/jim20250459
石墨烯/Bi2O2Se/石墨烯双异质结器件的光探测和仿生突触研究
Photonic-detection and Bionic-synapse of Graphene/Bi2O2Se/Graphene Bi-heterojunction Device
摘要
Abstract
In the process of modern electronic devices developing towards miniaturization,integration,and multi-functional intelligence,two-dimensional(2D)materials offer a promising development path for this field with their diverse structures and unique physicochemical properties.Among numerous 2D materials,Bi2O2Se has attracted extensive attention due to its suitable bandgap,high carrier mobility,and excellent environmental stability.However,current Bi2O2Se-based devices still suffer from issues such as large dark current and low responsivity,which hinder their further development in the field of high-performance optoelectronic devices.In this study,high-quality 2D Bi2O2Se nanosheets were grown on mica substrates via chemical vapor deposition.Innovatively,symmetric graphene(Gr)electrodes were used to construct a Gr/Bi2O2Se/Gr bi-heterojunction device.This structure utilizes the built-in electric field formed at the dual interfaces between Gr and Bi2O2Se to optimize carrier injection and separation processes.Subsequently,the current-voltage characteristics,transient current responses,and spectral responsivity of the device under dark and illumination were systematically characterized at different wavelengths.Especially,the dynamic electrical behavior of the device under pulsed light stimulation was thoroughly investigated to mimic short-term and long-term synaptic plasticity functions.Under 532 nm light illumination,the device exhibits a favorable responsivity of 2.52 A/W and a detectivity of 3.39×109 Jones,and maintains stable photoresponse across a wide wavelength range(365-1050 nm),confirming its potential as a broadband photodetector.Especially under 365 nm pulsed stimulation,the device demonstrates the transition from short-term plasticity to long-term plasticity.By adjusting the intensity,frequency,and number of light pulses,key biological synaptic behaviors,including excitatory postsynaptic currents and spike-timing-dependent plasticity,were accurately simulated.Furthermore,the device successfully reproduces the feature of"empirical learning",fully demonstrating its potential in the field of neuromorphic computing.关键词
二维材料/Bi2O2Se/石墨烯/光探测/仿生突触Key words
two-dimensional material/Bi2O2Se/graphene/photonic detection/bionic synapse分类
通用工业技术引用本文复制引用
孙丽,徐永善,高义华..石墨烯/Bi2O2Se/石墨烯双异质结器件的光探测和仿生突触研究[J].无机材料学报,2026,41(6):795-804,10.基金项目
国家自然科学基金(11874025,12274151)National Natural Science Foundation of China(11874025,12274151) （11874025,12274151）
