期刊
ACS NANO
卷 14, 期 5, 页码 5754-5762出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c00604
关键词
graphene nanoribbons; device integration; molecular spectroscopy; Coulomb blockade; Raman spectroscopy
类别
资金
- EC FP7-ITN MOLESCO grant [606728]
- FET open project QuIET [767187]
- EPSRC [EP/P027156/1, EP/N03337X/1, EP/N017188/1]
- EMPAPOSTDOCS-II program - European Unions Horizon 2020 research and innovation program under the Marie SklodowskaCurie grant [754364]
- UKRI [MR/S015329/2]
- Leverhulme Trust [ECF-2017186, ECF-2018-375]
- Swiss National Science Foundation [20PC21-155644]
- European Unions Horizon 2020 research and innovation program [785219]
- Office of Naval Research BRC Program [N00014-12-1-1009]
- EPSRC [EP/N03337X/1, EP/N017188/1, EP/P027156/1] Funding Source: UKRI
- UKRI [MR/S015329/2] Funding Source: UKRI
- Swiss National Science Foundation (SNF) [20PC21_155644] Funding Source: Swiss National Science Foundation (SNF)
Graphene nanoribbons (GNRs) have attracted strong interest from researchers worldwide, as they constitute an emerging class of quantum-designed materials. The major challenges toward their exploitation in electronic applications include reliable contacting, complicated by their small size (<50 nm), and the preservation of their physical properties upon device integration. In this combined experimental and theoretical study, we report on the quantum dot behavior of atomically precise GNRs integrated in a device geometry. The devices consist of a film of aligned five-atom-wide GNRs (5-AGNRs) transferred onto graphene electrodes with a sub 5 nm nanogap. We demonstrate that these narrow-bandgap 5-AGNRs exhibit metal-like behavior at room temperature and single-electron transistor behavior for temperatures below 150 K. By performing spectroscopy of the molecular levels at 13 K, we obtain addition energies in the range of 200-300 meV. DFT calculations predict comparable addition energies and reveal the presence of two electronic states within the bandgap of infinite ribbons when the finite length of the 5-AGNR is accounted for. By demonstrating the preservation of the 5-AGNRs' molecular levels upon device integration, as demonstrated by transport spectroscopy, our study provides a critical step forward in the realization of more exotic GNR-based nanoelectronic devices.
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