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Effect of Electron ...
Effect of Electron Injection in Copper-Contacted Graphene Nanoribbons
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- Simonov, Konstantin A. (författare)
- Uppsala University,Lund University,Lunds universitet,Uppsala universitet,Molekyl- och kondenserade materiens fysik,MAX IV, Lund University, Box 118, 22100 Lund, Sweden.; St Petersburg State Univ, VA Fock Inst Phys, St Petersburg 198504, Russia,MAX IV-laboratoriet,MAX IV Laboratory,Saint Petersburg State University
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- Vinogradov, Nikolay A. (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Saint Petersburg State University
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- Vinogradov, Alexander S. (författare)
- V.A. Fock Institute of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia,Saint Petersburg State University
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- Generalov, Alexander V. (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Saint Petersburg State University
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- Svirskiy, Gleb I. (författare)
- V.A. Fock Institute of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia,Saint Petersburg State University
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- Cafolla, Attilio A. (författare)
- School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
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- Mårtensson, Nils (författare)
- Uppsala University,Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Preobrajenski, Alexei B. (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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(creator_code:org_t)
- 2016-07-18
- 2016
- Engelska.
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Ingår i: Nano Reseach. - : Springer Science and Business Media LLC. - 1998-0124 .- 1998-0000. ; 9:9, s. 2735-2746
- Relaterad länk:
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- For practical electronic device applications of graphene nanoribbons (GNRs), it is essential to have abrupt and well-defined contacts between the ribbon and the adjacent metal lead. By analogy with graphene, these contacts can induce electron or hole doping, which may significantly affect the I/V characteristics of the device. Cu is among the most popular metals of choice for contact materials. In this study, we investigate the effect of in situ intercalation of Cu on the electronic structure of atomically precise, spatially aligned armchair GNRs of width N = 7 (7-AGNRs) fabricated via a bottom-up method on the Au(788) surface. Scanning tunneling microscopy data reveal that the complete intercalation of about one monolayer of Cu under 7-AGNRs can be facilitated by gentle annealing of the sample at 80 A degrees C. Angle-resolved photoemission spectroscopy (ARPES) data clearly reflect the one-dimensional character of the 7-AGNR band dispersion before and after intercalation. Moreover, ARPES and core-level photoemission results show that intercalation of Cu leads to significant electron injection into the nanoribbons, which causes a pronounced downshift of the valence and conduction bands of the GNR with respect to the Fermi energy (Delta E similar to 0.5 eV). As demonstrated by ARPES and X-ray absorption spectroscopy measurements, the effect of Cu intercalation is restricted to n-doping only, without considerable modification of the band structure of the GNRs. Post-annealing of the 7-AGNRs/Cu/Au(788) system at 200 A degrees C activates the diffusion of Cu into Au and the formation of a Cu-rich surface Au layer. Alloying of intercalated Cu leads to the recovery of the initial position of GNR-related bands with respect to the Fermi energy (E (F)), thus, proving the tunability of the induced n-doping.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology -- Nano-technology (hsv//eng)
Nyckelord
- graphene nanoribbons
- bottom-up method
- copper intercalation
- charge injection
- ARPES
- Scanning tunneling microscopy
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- angle-resolved photoemission spectroscopy (ARPES)
- bottom-up method
- charge injection
- copper intercalation
- graphene nanoribbons
- scanning tunneling microscopy
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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