van der Waals contact engineering of graphene field-effect transistors for large-area flexible electronics

Liu, F., Navaraj, W., Yogeswaran, N., Gregory, D. H. and Dahiya, R. (2019) van der Waals contact engineering of graphene field-effect transistors for large-area flexible electronics. ACS Nano, 13(3), pp. 3257-3268. (doi:10.1021/acsnano.8b09019) (PMID:30835440)

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Abstract

Graphene has great potential for high-performance flexible electronics. Although studied for more than a decade, contacting graphene efficiently, especially for large-area, flexible electronics, is still a challenge. Here, by engineering the graphene-metal van der Waals (vdW) contact, we demonstrate that ultra-low contact resistance is achievable via a bottom-contact strategy incorporating a simple transfer process without any harsh thermal treatment (>150°C). The majority of the fabricated devices show contact resistances below 200 Ω·µm with values as low as 65 Ω·µm achievable. This is on a par with the state-of-the-art top- and edge-contacted graphene field-effect transistors (GFETs). Further, our study reveals that these contacts, despite the presumed weak nature of the vdW interaction, are stable under various bending conditions, thus guaranteeing compatibility with flexible electronics with improved performance. This work illustrates the potential of the previously underestimated vdW contact approach for large-area flexible electronics.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dahiya, Professor Ravinder and Liu, Fengyuan and Navaraj, Mr William and Yogeswaran, Mr Nivasan and Gregory, Professor Duncan
Authors: Liu, F., Navaraj, W., Yogeswaran, N., Gregory, D. H., and Dahiya, R.
College/School:College of Science and Engineering
College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:ACS Nano
Publisher:American Chemical Society
ISSN:1936-0851
ISSN (Online):1936-086X
Published Online:05 March 2019
Copyright Holders:Copyright © 2019 American Chemical Society
First Published:First published in ACS Nano 13(3):3257-3268
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
3017280Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/R029644/1ENG - Electronics & Nanoscale Engineering
663861Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering and Physical Sciences Research Council (EPSRC)EP/M002527/1ENG - ENGINEERING ELECTRONICS & NANO ENG