Variability in synthetic MoS2 devices: Effect of the growth substrate

Abdullah Alharbi, Davood Shahrjerdi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Implementing a realistic electronic system from transition metal dichalcogenides (TMDs) relies on the ability to produce high-performance devices with homogenous properties. Continuing progress on large-area growth techniques, e.g. chemical vapor deposition (CVD) has improved the optical and electrical properties of monolayer TMDs, including MoS2. However, reducing device-to-device variations remains a challenge [1]-[2], spurring new investigations to understand the physical origins of this problem in TMD devices. Here, we show that the strong coupling between the as-grown monolayer MoS2 and the SiO2 growth substrate causes (1) significant inhomogeneity in the electrical properties of the transistors and (2) significant degradation of the device metrics including carrier mobility and contact resistance. By reducing the binding energy, and thus increasing the van der Waals gap, between the MoS2 and the original growth substrate using our new gold-assisted layer transfer, we observe remarkable improvements in key device metrics (~7× in mobility and ~100× in contact resistance) and device variability (~10×).

Original languageEnglish (US)
Title of host publication2018 76th Device Research Conference, DRC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538630280
DOIs
StatePublished - Aug 20 2018
Event76th Device Research Conference, DRC 2018 - Santa Barbara, United States
Duration: Jun 24 2018Jun 27 2018

Publication series

NameDevice Research Conference - Conference Digest, DRC
Volume2018-June
ISSN (Print)1548-3770

Other

Other76th Device Research Conference, DRC 2018
CountryUnited States
CitySanta Barbara
Period6/24/186/27/18

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Alharbi, A., & Shahrjerdi, D. (2018). Variability in synthetic MoS2 devices: Effect of the growth substrate. In 2018 76th Device Research Conference, DRC 2018 [8442254] (Device Research Conference - Conference Digest, DRC; Vol. 2018-June). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/DRC.2018.8442254