We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions.
- Authors
Senkovskiy, Boris V.; Nenashev, Alexey V.; Alavi, Seyed K.; Falke, Yannic; Hell, Martin; Bampoulis, Pantelis; Rybkovskiy, Dmitry V.; Usachov, Dmitry Yu.; Fedorov, Alexander V.; Chernov, Alexander I.; Gebhard, Florian; Meerholz, Klaus; Hertel, Dirk; Arita, Masashi; Okuda, Taichi; Miyamoto, Koji; Shimada, Kenya; Fischer, Felix R.; Michely, Thomas; Baranovskii, Sergei D.
- Abstract
Lateral heterojunctions of atomically precise graphene nanoribbons (GNRs) hold promise for applications in nanotechnology, yet their charge transport and most of the spectroscopic properties have not been investigated. Here, we synthesize a monolayer of multiple aligned heterojunctions consisting of quasi-metallic and wide-bandgap GNRs, and report characterization by scanning tunneling microscopy, angle-resolved photoemission, Raman spectroscopy, and charge transport. Comprehensive transport measurements as a function of bias and gate voltages, channel length, and temperature reveal that charge transport is dictated by tunneling through the potential barriers formed by wide-bandgap GNR segments. The current-voltage characteristics are in agreement with calculations of tunneling conductance through asymmetric barriers. We fabricate a GNR heterojunctions based sensor and demonstrate greatly improved sensitivity to adsorbates compared to graphene based sensors. This is achieved via modulation of the GNR heterojunction tunneling barriers by adsorbates. Here, the authors characterize the spectroscopic and transport properties of heterojunctions composed of quasi-metallic and semiconducting graphene nanoribbons (GNRs) with different widths, showing a predominant quantum tunnelling mechanism. The GNR heterojunctions can also be used to realize adsorbate sensors with high sensitivity.
- Subjects
PHOTOEMISSION; HETEROJUNCTIONS; QUANTUM tunneling composites; SCANNING tunneling microscopy; TUNNEL design &; construction; GRAPHENE; TUNNELS
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-22774-0