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Bottom-up synthesized graphene nanoribbons (GNRs) are an emerging class of designer quantum materials that possess superior properties including atomically- controlled uniformity and chemically tunable electronic properties. GNR-based devices are promising candidates for next-generation electronic, spintronic, and thermoelectric applications. However, a significant portion of the GNRs synthe- sized to date are unstable under ambient conditions and require protection from the environment. Here, we encapsulate 9-atom wide armchair GNRs (9-AGNRs) in hexagonal boron-nitride (h−BN) and contact them using metallic edge contacts. At 9 K, quantum dot (QD) behavior with well-defined Coulomb diamonds (CDs) is observed, with addition energies in the range of 16 to 400 meV. For increasing temperatures, charge transport through the 9-AGNR film, occur- ring via a combination of temperature-activated hopping and polaron-assisted tunneling, starts to dominate, with a crossover between QD transport and film transport occurring at around 100 K. At room temperature, our short-channel field-effect transistor devices exhibit on/off ratios as high as 3×10^5. Overall, our work demonstrates that 9-AGNRs can be contacted while being encapsulated in h−BN. This strategy opens the way for a whole range of GNRs candidates that are unstable under ambient conditions to be incorporated into electronic and spintronic devices.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Graphene nanoribbons, electrical contact, quantum dot

Date published: 2023-10-10

Publisher: American Chemical Society (ACS)

Journal:

• ACS Nano (ISSN: 1936086X) vol. 17 issue. 19 p. 18706-18715

Funding:

• Werner Siemens-Stiftung
• Ministry of Education, Culture, Sports, Science and Technology
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 189924
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 196795
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 200020 182015
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 205602
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung PCEFP2_203663
• Staatssekretariat f?r Bildung, Forschung und Innovation MB22.00076
• H2020 Marie Sklodowska-Curie Actions 754364
• H2020 Future and Emerging Technologies 767187
• H2020 Future and Emerging Technologies 881603
• Office of Naval Research N00014-18-1-2708
• Japan Society for the Promotion of Science 20H00354
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• H2020 European Research Council 787414

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acsnano.3c00782

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Updated at: 2025-02-14 12:31:08 +0900

Published on MDR: 2025-02-14 12:31:08 +0900