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Resistivity of Rotated Graphite-Graphene Contacts

Robust electrical contact of bulk conductors to two-dimensional (2D) material, such as graphene, is critical to the use of these 2D materials in practical electronic devices. Typical metallic contacts to graphene, whether edge or areal, yield a resistivity of no better than 100 Ω μm but are typicall... Full description

Journal Title: Nano letters 13 July 2016, Vol.16(7), pp.4477-82
Main Author: Chari, Tarun
Other Authors: Ribeiro-Palau, Rebeca , Dean, Cory R , Shepard, Kenneth
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1530-6992 ; PMID: 27243333 Version:1 ; DOI: 10.1021/acs.nanolett.6b01657
Link: http://pubmed.gov/27243333
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recordid: medline27243333
title: Resistivity of Rotated Graphite-Graphene Contacts
format: Article
creator:
  • Chari, Tarun
  • Ribeiro-Palau, Rebeca
  • Dean, Cory R
  • Shepard, Kenneth
subjects:
  • Graphene
  • Commensurate Angles
  • Contact Resistivity
  • Graphite
ispartof: Nano letters, 13 July 2016, Vol.16(7), pp.4477-82
description: Robust electrical contact of bulk conductors to two-dimensional (2D) material, such as graphene, is critical to the use of these 2D materials in practical electronic devices. Typical metallic contacts to graphene, whether edge or areal, yield a resistivity of no better than 100 Ω μm but are typically >10 kΩ μm. In this Letter, we employ single-crystal graphite for the bulk contact to graphene instead of conventional metals. The graphite contacts exhibit a transfer length up to four-times longer than in conventional metallic contacts. Furthermore, we are able to drive the contact resistivity to as little as 6.6 Ω μm(2) by tuning the relative orientation of the graphite and graphene crystals. We find that the contact resistivity exhibits a 60° periodicity corresponding to crystal symmetry with additional sharp decreases around 22° and 39°, which are among the commensurate angles of twisted bilayer graphene.
language: eng
source:
identifier: E-ISSN: 1530-6992 ; PMID: 27243333 Version:1 ; DOI: 10.1021/acs.nanolett.6b01657
fulltext: no_fulltext
issn:
  • 15306992
  • 1530-6992
url: Link


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subjectGraphene ; Commensurate Angles ; Contact Resistivity ; Graphite
descriptionRobust electrical contact of bulk conductors to two-dimensional (2D) material, such as graphene, is critical to the use of these 2D materials in practical electronic devices. Typical metallic contacts to graphene, whether edge or areal, yield a resistivity of no better than 100 Ω μm but are typically >10 kΩ μm. In this Letter, we employ single-crystal graphite for the bulk contact to graphene instead of conventional metals. The graphite contacts exhibit a transfer length up to four-times longer than in conventional metallic contacts. Furthermore, we are able to drive the contact resistivity to as little as 6.6 Ω μm(2) by tuning the relative orientation of the graphite and graphene crystals. We find that the contact resistivity exhibits a 60° periodicity corresponding to crystal symmetry with additional sharp decreases around 22° and 39°, which are among the commensurate angles of twisted bilayer graphene.
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abstractRobust electrical contact of bulk conductors to two-dimensional (2D) material, such as graphene, is critical to the use of these 2D materials in practical electronic devices. Typical metallic contacts to graphene, whether edge or areal, yield a resistivity of no better than 100 Ω μm but are typically >10 kΩ μm. In this Letter, we employ single-crystal graphite for the bulk contact to graphene instead of conventional metals. The graphite contacts exhibit a transfer length up to four-times longer than in conventional metallic contacts. Furthermore, we are able to drive the contact resistivity to as little as 6.6 Ω μm(2) by tuning the relative orientation of the graphite and graphene crystals. We find that the contact resistivity exhibits a 60° periodicity corresponding to crystal symmetry with additional sharp decreases around 22° and 39°, which are among the commensurate angles of twisted bilayer graphene.
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date2016-07-13