journal article·2018-08-28Open access

Boron-Doped Graphene Nanoribbons: Electronic Structure and Raman Fingerprint

Boris V. Senkovskiy, Dmitry Yu. Usachov, Alexander V. Fedorov, Tomas Marangoni, Danny Haberer, Cesare Tresca, Gianni Profeta, Vasile Caciuc, Shigeru Tsukamoto, Nicolae Atodiresei, Niels Ehlen, Chaoyu Chen, José Avila, Maria C. Asensio, Andrei Yu. Varykhalov, Alexei Nefedov, Christof Wöll, Timur K. Kim, Moritz Hoesch, Felix R. Fischer, Alexander Grüneis

ACS Nano· Volume 12· Issue 8

Abstract

We investigate the electronic and vibrational properties of bottom-up synthesized aligned armchair graphene nanoribbons of N = 7 carbon atoms width periodically doped by substitutional boron atoms (B-7AGNRs). Using angle-resolved photoemission spectroscopy and density functional theory calculations, we find that the dopant-derived valence and conduction band states are notably hybridized with electronic states of Au substrate and spread in energy. The interaction with the substrate leaves the bands with pure carbon character rather unperturbed. This results in an identical effective mass of ≈0.2 m0 for the next-highest valence band compared with pristine 7AGNRs. We probe the phonons of B-7AGNRs by ultrahigh-vacuum (UHV) Raman spectroscopy and reveal the existence of characteristic splitting and red shifts in Raman modes due to the presence of substitutional boron atoms. Comparing the Raman spectra for three visible lasers (red, green, and blue), we find that interaction with gold suppresses the Raman signal from B-7AGNRs and the energy of the green laser (2.33 eV) is closer to the resonant E22 transition. The hybridized electronic structure of the B-7AGNR–Au interface is expected to improve electrical characteristics of contacts between graphene nanoribbon and Au. The Raman fingerprint allows the easy identification of B-7AGNRs, which is particularly useful for device fabrication.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Graphene research and applications · Molecular Junctions and Nanostructures · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany

St. Petersburg State University, 7/9 Universitetskaya nab., Saint Petersburg 199034, Russia

IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

Department of Chemistry, University of California, Tan Hall 680, Berkeley, California 94720, United States

Department of Physical and Chemical Sciences and SPIN-CNR, University of L’Aquila, Via Vetoio 10, I-67100 Coppito, Italy

Institut des Nanosciences de Paris, Sorbonne Universités-UPMC univ Paris 6 and CNRS-UMR 7588, 4 place Jussieu, F-75252 Paris, France

Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

ANTARES Beamline, Synchrotron SOLEIL & Universite Paris-Saclay, L’ Orme des Merisiers, Saint Aubin-BP 48, 91192 Gif sur Yvette Cedex, France

Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany

Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom

DESY Photon Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany

Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Kavli Energy Nanosciences Institute at the University of California Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Funding

Agence Nationale de la Recherche · Universit?t zu K?ln · Deutsche Forschungsgemeinschaft · Russian Foundation for Basic Research · Saint Petersburg State University · H2020 European Research Council

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