Ultrafast non-volatile flash memory based on van der Waals heterostructures

Flash memory has become a ubiquitous solid-state memory device widely used in portable digital devices, computers and enterprise applications. The development of the information age has demanded improvements in memory speed and retention performance. Here we demonstrate an ultrafast non-volatile fla...

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Published inNature nanotechnology Vol. 16; no. 8; pp. 874 - 881
Main Authors Liu, Lan, Liu, Chunsen, Jiang, Lilai, Li, Jiayi, Ding, Yi, Wang, Shuiyuan, Jiang, Yu-Gang, Sun, Ya-Bin, Wang, Jianlu, Chen, Shiyou, Zhang, David Wei, Zhou, Peng
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 01.08.2021
Nature Publishing Group
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Summary:Flash memory has become a ubiquitous solid-state memory device widely used in portable digital devices, computers and enterprise applications. The development of the information age has demanded improvements in memory speed and retention performance. Here we demonstrate an ultrafast non-volatile flash memory based on MoS 2 /hBN/multilayer graphene van der Waals heterostructures, which achieves an ultrafast writing/erasing speed of 20 ns through two-triangle-barrier modified Fowler–Nordheim tunnelling. Using detailed theoretical analysis and experimental verification, we postulate that a suitable barrier height, gate coupling ratio and clean interface are the main reasons for the breakthrough writing/erasing speed of our flash memory devices. Because of its non-volatility this ultrafast flash memory could provide the foundation for the next generation of high-speed non-volatile memory. MoS 2 /hBN/graphene van der Waals heterostructures with a clean interface and optimized barrier height and gate coupling ratio enable the realization of ultrafast non-volatile flash memory.
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ISSN:1748-3387
1748-3395
DOI:10.1038/s41565-021-00921-4