Detecting the local transport properties and the dimensionality of transport of epitaxial graphene by a multi-point probe approach

被引:9
作者
Barreto, Lucas [1 ]
Perkins, Edward [1 ]
Johannsen, Jens [1 ]
Ulstrup, Soren [1 ]
Fromm, Felix [2 ]
Raidel, Christian [2 ]
Seyller, Thomas [3 ]
Hofmann, Philip [1 ]
机构
[1] Aarhus Univ, Dept Phys & Astron, Interdisciplinary Nanosci Ctr, DK-8000 Aarhus C, Denmark
[2] Univ Erlangen Nurnberg, Lehrstuhl Tech Phys, D-91058 Erlangen, Germany
[3] Tech Univ Chemnitz, Inst Phys, D-09126 Chemnitz, Germany
关键词
6H-SIC(0001);
D O I
10.1063/1.4789508
中图分类号
O59 [应用物理学];
学科分类号
摘要
The electronic transport properties of epitaxial monolayer graphene (MLG) and hydrogen-intercalated quasi free-standing bilayer graphene (QFBLG) on SiC(0001) are investigated by micro multi-point probes. Using a probe with 12 contacts, we perform four-point probe measurements with the possibility to effectively vary the contact spacing over more than one order of magnitude, allowing us to establish that the transport is purely two-dimensional. Combined with the carrier density obtained by angle-resolved photoemission spectroscopy, we find the room temperature mobility of MLG to be (870 +/- 120) cm(2)/V s. The transport in QFBLG is also found to be two-dimensional with a mobility of (1600 +/- 160) cm(2)/V s. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4789508]
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页数:3
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