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Resolving mobility ...
Resolving mobility anisotropy in quasi-free-standing epitaxial graphene by terahertz optical Hall effect
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- Armakavicius, Nerijus (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Kuhne, Philipp (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Eriksson, Jens (författare)
- Linköpings universitet,Linköping University,Sensor- och aktuatorsystem,Tekniska fakulteten
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- Bouhafs, Chamseddine (författare)
- Linköpings universitet,Linköping University,Italian Institute of Technology,Halvledarmaterial,Tekniska fakulteten,Ist Italiano Tecnol, Italy
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- Stanishev, Vallery (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Ivanov, Ivan Gueorguiev (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Yakimova, Rositsa (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Zakharov, Alexei A. (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Lund Univ, Sweden
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- Al-Temimy, Ameer (författare)
- Italian Institute of Technology,Ist Italiano Tecnol, Italy
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- Coletti, Camilla (författare)
- Italian Institute of Technology,Ist Italiano Tecnol, Italy; Ist Italiano Tecnol, Italy
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- Schubert, Mathias (författare)
- Linköpings universitet,Linköping University,Leibniz Institute of Polymer Research (IPF),University of Nebraska - Lincoln,Halvledarmaterial,Tekniska fakulteten,Univ Nebraska, NE 68508 USA; Leibniz Inst Polymerforsch eV, Germany
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- Darakchieva, Vanya (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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(creator_code:org_t)
- Elsevier BV, 2021
- 2021
- Engelska 12 s.
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Ingår i: Carbon. - : Elsevier BV. - 0008-6223 .- 1873-3891. ; 172, s. 248-259
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://liu.diva-por... (primary) (Raw object)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- In this work, we demonstrate the application of terahertz-optical Hall effect (THz-OHE) to determine directionally dependent free charge carrier properties of ambient-doped monolayer and quasi-free-standing-bilayer epitaxial graphene on 4H–SiC(0001). Directionally independent free hole mobility parameters are found for the monolayer graphene. In contrast, anisotropic hole mobility parameters with a lower mobility in direction perpendicular to the SiC surface steps and higher along the steps in quasi-free-standing-bilayer graphene are determined for the first time. A combination of THz-OHE, nanoscale microscopy and optical spectroscopy techniques are used to investigate the origin of the anisotropy. Different defect densities and different number of graphene layers on the step edges and terraces are ruled out as possible causes. Scattering mechanisms related to doping variations at the step edges and terraces as a result of different interaction with the substrate and environment are discussed and also excluded. It is suggested that the step edges introduce intrinsic scattering in quasi-free-standing-bilayer graphene, that is manifested as a result of the higher ratio between mean free path and average terrace width parameters. The suggested scenario allows to reconcile existing differences in the literature regarding the anisotropic electrical transport in epitaxial graphene.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Anisotropic mobility
- Anisotropic transport
- Free charge carriers
- Graphene
- Hydrogen intercalation
- Scattering mechanisms
- Terahertz optical Hall effect
- Graphene; Anisotropic transport; Free charge carriers; Anisotropic mobility; Hydrogen intercalation; Scattering mechanisms; Terahertz optical Hall effect
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Carbon
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Armakavicius, Ne ...
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Kuhne, Philipp
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Eriksson, Jens
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Bouhafs, Chamsed ...
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Stanishev, Valle ...
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Ivanov, Ivan Gue ...
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Yakimova, Rosits ...
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Zakharov, Alexei ...
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Al-Temimy, Ameer
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Coletti, Camilla
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Schubert, Mathia ...
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Darakchieva, Van ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Materialkemi
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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