Research output: Contribution to journal › Article › peer-review
Boron-Doped Graphene Nanoribbons : Electronic Structure and Raman Fingerprint. / Senkoyskiy, Boris V.; Usachov, Dmitry Yu.; Fedorov, Alexander V.; Marangoni, Tomas; Haberer, Danny; Tresca, Cesare; Profeta, Gianni; Caciuc, Vasile; Tsukamoto, Shigeru; Atodiresei, Nicolae; Ehlen, Niels; Chen, Chaoyu; Avila, Jose; Asensio, Maria C.; Varykhalov, Andrei Yu.; Nefedov, Alexei; Woell, Christof; Kim, Timur K.; Hoesch, Moritz; Fischer, Felix R.; Grueneis, Alexander.
In: ACS Nano, Vol. 12, No. 8, 28.08.2018, p. 7571-7582.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Boron-Doped Graphene Nanoribbons
T2 - Electronic Structure and Raman Fingerprint
AU - Senkoyskiy, Boris V.
AU - Usachov, Dmitry Yu.
AU - Fedorov, Alexander V.
AU - Marangoni, Tomas
AU - Haberer, Danny
AU - Tresca, Cesare
AU - Profeta, Gianni
AU - Caciuc, Vasile
AU - Tsukamoto, Shigeru
AU - Atodiresei, Nicolae
AU - Ehlen, Niels
AU - Chen, Chaoyu
AU - Avila, Jose
AU - Asensio, Maria C.
AU - Varykhalov, Andrei Yu.
AU - Nefedov, Alexei
AU - Woell, Christof
AU - Kim, Timur K.
AU - Hoesch, Moritz
AU - Fischer, Felix R.
AU - Grueneis, Alexander
PY - 2018/8/28
Y1 - 2018/8/28
N2 - 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 approximate to 0.2 m(0) 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 E-22 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.
AB - 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 approximate to 0.2 m(0) 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 E-22 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.
KW - graphene nanoribbons
KW - boron doping
KW - electronic structure
KW - ARPES
KW - Raman
KW - substrate interaction
KW - ON-SURFACE SYNTHESIS
KW - BOTTOM-UP FABRICATION
KW - BAND-GAP
KW - CRYSTALLITE SIZE
KW - SPECTROSCOPY
KW - ARMCHAIR
KW - HETEROJUNCTIONS
KW - SEMICONDUCTORS
KW - SCATTERING
KW - ENERGY
UR - http://www.scopus.com/inward/record.url?scp=85049970082&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/borondoped-graphene-nanoribbons-electronic-structure-raman-fingerprint
U2 - 10.1021/acsnano.8b04125
DO - 10.1021/acsnano.8b04125
M3 - статья
VL - 12
SP - 7571
EP - 7582
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 8
ER -
ID: 33794311