Platinum contacts for 9-atom-wide armchair graphene nanoribbons

Hsu, Chunwei; Rohde, Michael; Borin Barin, Gabriela; Gandus, Guido; Passerone, Daniele; Luisier, Mathieu; Ruffieux, Pascal; Fasel, Roman; van der Zant, Herre S. J.; Abbassi, Maria El (2023). Platinum contacts for 9-atom-wide armchair graphene nanoribbons. Applied physics letters, 122(17) American Institute of Physics 10.1063/5.0143663

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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.

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