Resistivity of Rotated Graphite–Graphene Contacts
Tarun Chari
Rebeca Ribeiro-Palau
Cory R. Dean
Kenneth Shepard
10.1021/acs.nanolett.6b01657.s001
https://acs.figshare.com/articles/journal_contribution/Resistivity_of_Rotated_Graphite_Graphene_Contacts/3425825
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<sup>2</sup> 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.
2016-05-31 00:00:00
bilayer graphene
bulk conductors
2 D materials
crystal symmetry
graphite contacts exhibit
bulk contact
contact resistivity exhibits
contact resistivity
6.6 Ω μ m 2
100 Ω μ m
transfer length
graphene crystals