Optimized graphene electrodes for contacting graphene nanoribbons

Optimized graphene electrodes for contacting graphene nanoribbons

Braun, Oliver (Swiss Federal Laboratories for Materials Science and Technology (Empa); University of Basel)
Overbeck, Jan (Swiss Federal Laboratories for Materials Science and Technology (Empa); University of Basel)
El Abbassi, M. (TU Delft QN/van der Zant Lab; Swiss Federal Laboratories for Materials Science and Technology (Empa); University of Basel; Kavli institute of nanoscience Delft)
Käser, Silvan (Swiss Federal Laboratories for Materials Science and Technology (Empa); University of Basel)
Furrer, Roman (Swiss Federal Laboratories for Materials Science and Technology (Empa))
Olziersky, Antonis (IBM Research)
Flasby, Alexander (Swiss Federal Laboratories for Materials Science and Technology (Empa))
Borin Barin, Gabriela (Swiss Federal Laboratories for Materials Science and Technology (Empa))
Perrin, M.L. (Swiss Federal Laboratories for Materials Science and Technology (Empa))

2021

Atomically precise graphene nanoribbons (GNRs) are a promising emerging class of designer quantum materials with electronic properties that are tunable by chemical design. However, many challenges remain in the device integration of these materials, especially regarding contacting strategies. We report on the device integration of uniaxially aligned and non-aligned 9-atom wide armchair graphene nanoribbons (9-AGNRs) in a field-effect transistor geometry using electron beam lithography-defined graphene electrodes. This approach yields controlled electrode geometries and enables higher fabrication throughput compared to previous approaches using an electrical breakdown technique. Thermal annealing is found to be a crucial step for successful device operation resulting in electronic transport characteristics showing a strong gate dependence. Raman spectroscopy confirms the integrity of the graphene electrodes after patterning and of the GNRs after device integration. Our results demonstrate the importance of the GNR-graphene electrode interface and pave the way for GNR device integration with structurally well-defined electrodes.

Field-effect transistor
Graphene electrodes
Graphene nanoribbons
Raman spectroscopy
Thermal annealing

http://resolver.tudelft.nl/uuid:53c0e94b-7ce3-422b-b484-3d9b6fe573c6

https://doi.org/10.1016/j.carbon.2021.08.001

0008-6223

Carbon, 184, 331-339

Institutional Repository

journal article

© 2021 Oliver Braun, Jan Overbeck, M. El Abbassi, Silvan Käser, Roman Furrer, Antonis Olziersky, Alexander Flasby, Gabriela Borin Barin, M.L. Perrin, More Authors