Dramatic Reduction of Contact Resistance via Ultrathin LiF in Two-Dimensional MoS2Field Effect Transistors

Hyunmin Cho, Donghee Kang, Yangjin Lee, Heesun Bae, Sungjae Hong, Yongjae Cho, Kwanpyo Kim, Yeonjin Yi, Ji Hoon Park, Seongil Im

Research output: Contribution to journalArticlepeer-review

Abstract

Molybdenum disulfide (MoS2) has been regarded as one of the most important n-type two-dimensional (2D) transition metal dichalcogenide semiconductors for nanoscale electron devices. Relatively high contact resistance (RC) remains as an issue in the 2D-devices yet to be resolved. Reliable technique is very compelling to practically produce low RC values in device electronics, although scientific approaches have been made to obtain a record-low RC. To resolve this practical issue, we here use thermal-evaporated ultrathin LiF between channel and source/drain metal to fabricate 2D-like MoS2 field effect transistors (FETs) with minimum RC. Under 4-bar FET method, RC less than ∼600 ω·μm is achieved from the LiF/Au contact MoS2 FET. Our normal 2-bar FET with LiF thus shows the same mobility as that of 4-bar FET that should have no RC in principle. On the basis of these results, ultrathin LiF is also applied for transparent conducting oxide contact, successfully enabling transparent MoS2 FETs.

Original languageEnglish
Pages (from-to)3503-3510
Number of pages8
JournalNano letters
Volume21
Issue number8
DOIs
Publication statusPublished - 2021 Apr 28

Bibliographical note

Funding Information:
The authors acknowledge the financial support from National Research Foundation of Korea (SRC program vdWMRC, Grant 2017R1A5A1014862). H.B and J.H.P acknowledge that this research was supported by Basic Science Research Program through NRF funded by the Ministry of Education (NRF-2020R1I1A1A01052216, NRF-2019R1I1A1A01063644), respectively. This work was partially supported by Yonsei Signature Research Cluster Program of 2021.

Publisher Copyright:
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All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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