All-graphene edge contacts: Electrical resistance of graphene T-junctions

Kåre Wedel Jacobsen, Jesper Toft Falkenberg, Nick Rübner Papior, Peter Bøggild, Antti-Pekka Jauho, Mads Brandbyge

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Abstract

Using ab-initio methods we investigate the possibility of three-terminalgraphene "T-junction" devices and show that these all-graphene edge contactsare energetically feasible when the 1D interface itself is free from foreignatoms. We examine the energetics of various junction structures as a functionof the atomic scale geometry. Three-terminal equilibrium Green's functions areused to determine the transmission spectrum and contact resistance of thesystem. We find that the most symmetric structures have a significant bindingenergy, and we determine the contact resistances in the junction to be in therange of 1-10 kΩμm which is comparable to the best contact resistance reportedfor edge-contacted graphene-metal contacts. We conclude that conductingall-carbon T-junctions should be feasible.
Original languageEnglish
JournalCarbon
Volume101
Pages (from-to)101-106
ISSN0008-6223
DOIs
Publication statusPublished - 2016

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