Weak UV-Stimulated Synaptic Transistors Based on Precise Tuning of Gallium-Doped Indium Zinc Oxide Nanofibers

Yuxiao Wang; Ruifu Zhou; Haofei Cong; Guangshou Chen; Yanyan Ma; Shuwen Xin; Dalong Ge; Yuanbin Qin; Seeram Ramakrishna; Xuhai Liu; Fengyun Wang

doi:10.1007/s42765-023-00318-z

Advanced Fiber Materials ›› 2023, Vol. 5 ›› Issue (6) : 1919 -1933. DOI: 10.1007/s42765-023-00318-z

Research Article

Weak UV-Stimulated Synaptic Transistors Based on Precise Tuning of Gallium-Doped Indium Zinc Oxide Nanofibers

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¹College of Physics and State Key Laboratory of Bio Fibers and Eco Textiles, Qingdao University, 266071, Qingdao, China

²College of Electronics and Information, Qingdao University, 266071, Qingdao, China

³School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710000, China

⁴Center for Nanofibers & Nanotechnology Department of Mechanical Engineering, National University of Singapore, 117574, Singapore, Singapore

^m fywang@qdu.edu.cn

Yuxiao Wang

is currently a Master candidate at Qingdao University. Her research interest focuses on optoelectronic synapses and neuromorphic devices.

Ruifu Zhou

received his Master’s degree from Qingdao University in 2023. His research interest focuses on low-dimensional material-based neuromorphic devices.

Haofei Cong

received her Master’s degree from Qingdao University in 2023. Her research interest focuses on low-dimensional optoelectronic materials and devices.

Guangshou Chen

is currently a master candidate at Qingdao University. His research interest focuses on low-dimensional field effect transistor and optical synapse device.

Yanyan Ma

is currently a master candidate at Qingdao University. Her research interest focuses on new energy materials and their applications in sodium-ion batteries.

Shuwen Xin

is currently a Master's candidate at Qingdao University. Her research interest focuses on the fabrication and research of low-dimensional optoelectronic devices.

Dalong Ge

is currently a master candidate at Qingdao University. His research interest focuses on regulation and testing of low-dimensional optoelectronic materials.

Yuanbin Qin

received his PhD degree from Institute of Physics, Chinese Academy of Sciences, China in 2011. He is now a senior engineer in charge of transmission electron microscopy (TEM) in State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University.

Seeram Ramakrishna

FREng, Everest Chair is a world-renowned poly-disciplinary professor of materials at the National University of Singapore, which is ranked among the top ten universities in the world. He is named among the World’s Most Influential Minds (Thomson Reuters); Top 1% Highly Cited Researchers in material science as well as cross-field categories (Clarivate Analytics); and World Top 100 Scientists 2023. His publications to date have an H-index of 182 and 163,173 citations. He is an elected Fellow of UK Royal Academy of Engineering (FREng); AAAS; ASM International; ASME; and AIMBE, USA. He is an Editorial board member of NPJ Urban Sustainability journal; Materials Circular Economy, Current Opinion in Biomedical Engineering, eScience journal, and Advanced Fiber Materials journal.

Xuhai Liu

received his PhD degree in functional materials & nanotechnology from the University of Southern Den mark in 2013, and later worked at Technische Universitat Dresden in Germany, Nanjing University of Science & Technology, and Nanjing University of Information Science and Technology. He is currently an associate professor at Qingdao University, with research interests focusing on low-dimensional material-based optoelectronics and bioelectronics.

Fengyun Wang

received her PhD degree in materials physics & chemistry from the City University of Hong Kong in 2012, and later worked as a research fellow. In 2013, she joined Qingdao University as a professor. Her research program aims to utilize chemistry, physics, materials science, and various engineering disciplines to synthesize low-dimensional metal oxide semiconductors, perovskites, and MXenes, for bioelectronics, photonics, and energy storage devices.

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Abstract

In this work, a light-stimulated artificial synaptic transistor based on one-dimensional nanofibers of gallium-doped indium zinc oxides (IGZO) is demonstrated. The introduction of gallium into the nanofiber lattice can effectively alter the morphology and crystallinity, leading to a wider regulatory range of synaptic plasticity. The fabricated IGZO synaptic transistor with the optimal gallium concentration and low surface defects exhibits a superior photoresponsivity of 4300 A·W⁻¹ and excellent photosensitivity, which can detect light signals as weak as 0.03 mW·cm⁻². In particular, the paired-pulse facilitation index reaches up to 252% with over 2 h of enhanced memory retention exhibiting the long-term potentiation. Furthermore, the simulated image contrast and image recognition accuracy based on the newly designed IGZO synaptic transistors are successfully enhanced. These remarkable behaviors of light-stimulated synapses utilizing low-cost electrospun nanofibers have potential for ultraweak light applications in future artificial systems.

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Yuxiao Wang, Ruifu Zhou, Haofei Cong, Guangshou Chen, Yanyan Ma, Shuwen Xin, Dalong Ge, Yuanbin Qin, Seeram Ramakrishna, Xuhai Liu, Fengyun Wang. Weak UV-Stimulated Synaptic Transistors Based on Precise Tuning of Gallium-Doped Indium Zinc Oxide Nanofibers. Advanced Fiber Materials, 2023, 5(6): 1919-1933 DOI:10.1007/s42765-023-00318-z