Senkovskiy, Boris, V, Nenashev, Alexey, V, Alavi, Seyed K., Falke, Yannic, Hell, Martin, Bampoulis, Pantelis ORCID: 0000-0002-2347-5223, 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 ORCID: 0000-0002-1945-2352, Fischer, Felix R., Michely, Thomas, Baranovskii, Sergei D., Lindfors, Klas, Szkopek, Thomas and Grueneis, Alexander (2021). Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions. Nat. Commun., 12 (1). BERLIN: NATURE RESEARCH. ISSN 2041-1723

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Senkovskiy, Boris, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nenashev, Alexey, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alavi, Seyed K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falke, YannicUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hell, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bampoulis, PantelisUNSPECIFIEDorcid.org/0000-0002-2347-5223UNSPECIFIED
Rybkovskiy, Dmitry, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Usachov, Dmitry YuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fedorov, Alexander, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chernov, Alexander, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gebhard, FlorianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meerholz, KlausUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hertel, DirkUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Arita, MasashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Okuda, TaichiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Miyamoto, KojiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shimada, KenyaUNSPECIFIEDorcid.org/0000-0002-1945-2352UNSPECIFIED
Fischer, Felix R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baranovskii, Sergei D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lindfors, KlasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szkopek, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grueneis, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-604281
DOI: 10.1038/s41467-021-22774-0
Journal or Publication Title: Nat. Commun.
Volume: 12
Number: 1
Date: 2021
Publisher: NATURE RESEARCH
Place of Publication: BERLIN
ISSN: 2041-1723
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
DEPENDENT BAND-GAP; NOBEL LECTURE; WIDTHMultiple languages
Multidisciplinary SciencesMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60428

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