The Nonvolatile Memory and Neuromorphic Simulation of ReS2/h‐BN/Graphene Floating Gate Devices Under Photoelectrical Hybrid Modulations

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-07, Vol.20 (30), p.e2311630-n/a
• Main Authors: Li, Wei, Li, Jiaying, Mu, Tianhui, Li, Jiayao, Sun, Pengcheng, Dai, Mingjian, Chen, Yuhua, Yang, Ruijing, Chen, Zhao, Wang, Yucheng, Wu, Yupan, Wang, Shaoxi
• Format: Article
• Language: English
• Subjects: 2D materials; Artificial neural networks; Carrier mobility; Chips (memory devices); Datasets; Energy gap; Flat surfaces; floating gate devices; Graphene; Heterojunctions; Memory devices; Neuromorphic computing; nonvolatile memory; Optical memory (data storage); Optical pulses; Optoelectronic devices; Photoelectricity; ReS2/h‐BN/Gr heterojunction; Two dimensional materials
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202311630

The floating gate devices, as a kind of nonvolatile memory, obtain great application potential in logic‐in‐memory chips. The 2D materials have been greatly studied due to atomically flat surfaces, higher carrier mobility, and excellent photoelectrical response. The 2D ReS2 flake is an excellent candidate for channel materials due to thickness‐independent direct bandgap and outstanding optoelectronic response. In this paper, the floating gate devices are prepared with the ReS2/h‐BN/Gr heterojunction. It obtains superior nonvolatile electrical memory characteristics, including a higher memory window ratio (81.82%), tiny writing/erasing voltage (±8 V/2 ms), long retention (>1000 s), and stable endurance (>1000 times) as well as multiple memory states. Meanwhile, electrical writing and optical erasing are achieved by applying electrical and optical pulses, and multilevel storage can easily be achieved by regulating light pulse parameters. Finally, due to the ideal long‐time potentiation/depression synaptic weights regulated by light pulses and electrical pulses, the convolutional neural network (CNN) constructed by ReS2/h‐BN/Gr floating gate devices can achieve image recognition with an accuracy of up to 98.15% for MNIST dataset and 91.24% for Fashion‐MNIST dataset. The research work adds a powerful option for 2D materials floating gate devices to apply to logic‐in‐memory chips and neuromorphic computing. A floating gate device (FGD) based on ReS2/h‐BN/graphene heterostructure is developed and its photoelectrical hybrid memory and neuromorphic simulation are studied. Benefiting from the outstanding photoelectrical response of ReS2, the excellent nonvolatile memory and higher recognition accuracy of artificial neural network constructed by this FGD indicate that FGD based on ReS2 channel has a great potential in sense–memory‐computation integration chips.