Transport properties of high-quality epitaxial graphene on 6H-SiC(0001)

Beitrag in einer Fachzeitschrift
(Letter)


Details zur Publikation

Autor(en): Jobst J, Waldmann D, Speck F, Hirner R, Maude D, Seyller T, Weber HB
Zeitschrift: Solid State Communications
Verlag: Elsevier
Jahr der Veröffentlichung: 2011
Band: 151
Heftnummer: 16
Seitenbereich: 1061-1064
ISSN: 0038-1098


Abstract


We have extensively studied the electronic properties of epitaxial graphene grown on the Si face of a 6H silicon carbide substrate by thermal decomposition in an argon atmosphere. Using e-beam lithography, large van der Pauw structures as well as Hall bars were patterned. Their size ranged from millimeters down to submicrometer-sized Hall bars, the latter entirely placed on atomically flat substrate terraces. We found reproducible electronic properties, independent of the sample size and orientation, over a broad temperature range. A comparison of the mobility values indicated no enhanced scattering at the macroscopic step edges of the SiC substrate and due to adsorbed molecules. However, the strong coupling to the substrate results in an elevated charge carrier density n and a reduced mobility mu compared to exfoliated graphene. If n is decreased the mobility rises substantially (up to 29 000 cm(2)/V s at 25 K), and Shubnikov-de Haas oscillations and the graphene-like quantum Hall effect become visible. This leads to the conclusion that the electrons in epitaxial graphene have the same quasi-relativistic properties previously shown in exfoliated graphene and expected from theory. (C) 2011 Elsevier Ltd. All rights reserved.



FAU-Autoren / FAU-Herausgeber

Jobst, Johannes
Lehrstuhl für Angewandte Physik
Seyller, Thomas PD Dr.
Naturwissenschaftliche Fakultät
Speck, Florian
Naturwissenschaftliche Fakultät
Waldmann, Daniel
Lehrstuhl für Angewandte Physik
Weber, Heiko B. Prof. Dr.
Lehrstuhl für Angewandte Physik


Zitierweisen

APA:
Jobst, J., Waldmann, D., Speck, F., Hirner, R., Maude, D., Seyller, T., & Weber, H.B. (2011). Transport properties of high-quality epitaxial graphene on 6H-SiC(0001). Solid State Communications, 151(16), 1061-1064. https://dx.doi.org/10.1016/j.ssc.2011.05.015

MLA:
Jobst, Johannes, et al. "Transport properties of high-quality epitaxial graphene on 6H-SiC(0001)." Solid State Communications 151.16 (2011): 1061-1064.

BibTeX: 

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