Platinum contacts for 9-atom-wide armchair graphene nanoribbons

Journal article (2023)

Authors

C. Hsu QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
Michael Rohde Kavli institute of nanoscience Delft, Student
Gabriela Borin Barin Swiss Federal Laboratories for Materials Science and Technology (Empa)
Guido Gandus Swiss Federal Laboratories for Materials Science and Technology (Empa), ETH Zürich
Daniele Passerone Swiss Federal Laboratories for Materials Science and Technology (Empa)
Mathieu Luisier ETH Zürich
Pascal Ruffieux Swiss Federal Laboratories for Materials Science and Technology (Empa)
Roman Fasel Swiss Federal Laboratories for Materials Science and Technology (Empa)
H.S.J. van der Zant QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
M. El Abbassi Kavli institute of nanoscience Delft, QN/van der Zant Lab - AS
Research Group
QN/van der Zant Lab (AS) (TU Delft)
Copyright: © 2023 C. Hsu, Michael Rohde, Gabriela Borin Barin, Guido Gandus, Daniele Passerone, Mathieu Luisier, Pascal Ruffieux, Roman Fasel, H.S.J. van der Zant, M. El Abbassi
DOI
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https://doi.org/10.1063/5.0143663
More Info
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Published Date

2023

Language

English

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/van der Zant Lab

Abstract

Creating a good contact between electrodes and graphene nanoribbons (GNRs) has been a long-standing challenge in searching for the next GNR-based nanoelectronics. This quest requires the controlled fabrication of sub-20 nm metallic gaps, a clean GNR transfer minimizing damage and organic contamination during the device fabrication, as well as work function matching to minimize the contact resistance. Here, we transfer 9-atom-wide armchair-edged GNRs (9-AGNRs) grown on Au(111)/mica substrates to pre-patterned platinum electrodes, yielding polymer-free 9-AGNR field-effect transistor devices. Our devices have a resistance in the range of 106-108 Ω in the low-bias regime, which is 2-4 orders of magnitude lower than previous reports. Density functional theory calculations combined with the non-equilibrium Green's function method explain the observed p-type electrical characteristics and further demonstrate that platinum gives strong coupling and higher transmission in comparison to other materials, such as graphene.