Gate-tunable large-scale flexible monolayer MoS2 devices for photodetectors and optoelectronic synapses

• Published in: Nano research 2022-06, Vol.15 (6), p.5418-5424
• Main Authors: Li, Na, He, Congli, Wang, Qinqin, Tang, Jianshi, Zhang, Qingtian, Shen, Cheng, Tang, Jian, Huang, Heyi, Wang, Shuopei, Li, Jiawei, Huang, Biying, Wei, Zheng, Guo, Yutuo, Yuan, Jiahao, Yang, Wei, Yang, Rong, Shi, Dongxia, Zhang, Guangyu
• Format: Article
• Language: English
• Subjects: Artificial neural networks; Associative learning; Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Chemistry and Materials Science; Classical conditioning; Communications systems; Condensed Matter Physics; Learning; Learning behavior; Light effects; Long term memory; Long-term depression; Long-term potentiation; Materials Science; Mimicry; Molybdenum disulfide; Monolayers; Nanotechnology; Neural networks; Neuromorphic computing; Optical communication; Optoelectronic devices; Paired-pulse facilitation; Photometers; Research Article; Short term memory; Synapses; Visible spectrum; Visual perception; Voltage pulses
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-022-4122-z

Photodetectors and optoelectronic synapses are vital for construction of artificial visual perception system. However, the hardware implementations of optoelectronic-neuromorphic devices based on conventional architecture usually suffer from poor scalability, light response range, and limited functionalities. Here, large-scale flexible monolayer MoS 2 devices integrating photodetectors and optoelectronic synapses over the entire visible spectrum in one device have been realized, which can be used in photodetection, optical communication, artificial visual perception system, and optical artificial neural network. By modulating gate voltages, we enable MoS 2 -based devices to be photodetectors and also optoelectronic synapses. Importantly, the MoS 2 -based optoelectronic synapses could implement many synaptic functions and neuromorphic characteristics, such as short-term memory (STM), long-term memory (LTM), paired-pulse facilitation (PPF), long-term potentiation (LTP)/long-term depression (LTD), and “learning-experience” behavior. Furthermore, an associative learning behavior (the classical conditioning Pavlov’s dog experiment) was emulated using paired stimulation of optical and voltage pulses. These results facilitate the development of MoS 2 -based multifunctional optoelectronic devices with a simple device structure, showing great potential for photodetection, optoelectronic neuromorphic computing, human visual systems mimicking, as well as wearable and implantable electronics.