Pinning-free edge contact monolayer MoS2FET

Terry Y.T. Hung*, Shih Yun Wang, Chih Piao Chuu, Yun Yan Chung, Ang Sheng Chou, Feng Shew Huang, Tac Chen, Ming Yang Li, Chao Ching Cheng, Jin Cai, Chao Hsin Chien, Wen Hao Chang, H. S.Philip Wong, Lain Jong Li

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations


One-dimensional contact (so-called edge contact) to monolayer 2D materials has been proposed for ultimate transistor scaling but reported on-state currents are much lower than those from top contact devices. Experiments in this work reveal that the fabrication processes for metal MoS2 contact strongly affect the electrical characteristics such as Schottky barrier height. Using in-situ 2D etching and metal deposition, we obtained Fermi-level pinning-free Ni-MoS2 edge contact transistor devices. Moreover, it reaches the highest on-state current among those TMDs edge contact devices reported in literatures and comparable to top-contact ones. First-principles calculation reveals the evolution of local electronic structure from strong metallization at the edge contact "interline"(1D equivalent of "interface") to semiconductor in the channel region. The short length (<3 nm) of metal-semiconductor transition and the low-dimensionality nature of the edge contact eliminate Fermi level pining. The pinning free edge contact formed through in-situ process enables 2D based high performance FET.

Original languageEnglish
Title of host publication2020 IEEE International Electron Devices Meeting, IEDM 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728188881
StatePublished - 12 Dec 2020
Event66th Annual IEEE International Electron Devices Meeting, IEDM 2020 - Virtual, San Francisco, United States
Duration: 12 Dec 202018 Dec 2020

Publication series

NameTechnical Digest - International Electron Devices Meeting, IEDM
ISSN (Print)0163-1918


Conference66th Annual IEEE International Electron Devices Meeting, IEDM 2020
Country/TerritoryUnited States
CityVirtual, San Francisco


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