Journal Article

FZJ-2018-07524

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Boron-Doped Graphene Nanoribbons: Electronic Structure and Raman Fingerprint

Senkovskiy, B. V. (Corresponding author) ; Usachov, D. Y. ; Fedorov, A. V. ; Marangoni, T. ; Haberer, D. ; Tresca, C. ; Profeta, G. ; Caciuc, V.FZJ* ; Tsukamoto, S.FZJ* ; Atodiresei, N.FZJ* ; Ehlen, N. ; Chen, C. ; Avila, J. ; Asensio, M. C. ; Varykhalov, A. Y. ; Nefedov, A. ; Wöll, C. ; Kim, T. K. ; Hoesch, M. ; Fischer, F. R. ; Grüneis, A. (Corresponding author)

2018
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/20974  doi:10.1021/acsnano.8b04125

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.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. Hybrid 2D-based interfaces from first principles (jias1e_20180501) (jias1e_20180501)

Appears in the scientific report 2018

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 10 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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