Hole-channel conductivity in epitaxial graphene determined by terahertz optical-Hall effect and midinfrared ellipsometry

T. Hofmann; A. Boosalis; P. Kühne; C. M. Herzinger; J. A. Woollam; D. K. Gaskill; J. L. Tedesco; M. Schubert

doi:10.1063/1.3548543

Hole-channel conductivity in epitaxial graphene determined by terahertz optical-Hall effect and midinfrared ellipsometry

T. Hofmann, A. Boosalis, P. Kühne, C. M. Herzinger, J. A. Woollam, D. K. Gaskill, J. L. Tedesco, M. Schubert

Electrical & Computer Engineering

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

We report noncontact, optical determination of free-charge carrier mobility, sheet density, and resistivity parameters in epitaxial graphene at room temperature using terahertz and midinfrared ellipsometry and optical-Hall effect measurements. The graphene layers are grown on Si- and C-terminated semi-insulating 6H silicon carbide polar surfaces. Data analysis using classical Drude functions and multilayer modeling render the existence of a p -type channel with different sheet densities and effective mass parameters for the two polar surfaces. The optically obtained parameters are in excellent agreement with results from electrical Hall effect measurements.

Original language	English (US)
Article number	041906
Journal	Applied Physics Letters
Volume	98
Issue number	4
DOIs	https://doi.org/10.1063/1.3548543
State	Published - Jan 24 2011

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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@article{7164ccbe91fe423dae6cd593258eece2,

title = "Hole-channel conductivity in epitaxial graphene determined by terahertz optical-Hall effect and midinfrared ellipsometry",

abstract = "We report noncontact, optical determination of free-charge carrier mobility, sheet density, and resistivity parameters in epitaxial graphene at room temperature using terahertz and midinfrared ellipsometry and optical-Hall effect measurements. The graphene layers are grown on Si- and C-terminated semi-insulating 6H silicon carbide polar surfaces. Data analysis using classical Drude functions and multilayer modeling render the existence of a p -type channel with different sheet densities and effective mass parameters for the two polar surfaces. The optically obtained parameters are in excellent agreement with results from electrical Hall effect measurements.",

author = "T. Hofmann and A. Boosalis and P. K{\"u}hne and Herzinger, {C. M.} and Woollam, {J. A.} and Gaskill, {D. K.} and Tedesco, {J. L.} and M. Schubert",

note = "Funding Information: The authors would like to acknowledge financial support from the Army Research Office (D. Woolard, Contract No. W911NF-09-C-0097), the National Science Foundation (Grant Nos. MRSEC DMR-0820521, MRI DMR-0922937, DMR-0907475), the University of Nebraska-Lincoln, the J.A. Woollam Foundation, and the Office of Naval Research. J.L.T. acknowledges support from the American Society for Engineering Education-Naval Research Laboratory Postdoctoral Fellowship Program. ",

year = "2011",

month = jan,

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doi = "10.1063/1.3548543",

language = "English (US)",

volume = "98",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Hole-channel conductivity in epitaxial graphene determined by terahertz optical-Hall effect and midinfrared ellipsometry

AU - Hofmann, T.

AU - Boosalis, A.

AU - Kühne, P.

AU - Herzinger, C. M.

AU - Woollam, J. A.

AU - Gaskill, D. K.

AU - Tedesco, J. L.

AU - Schubert, M.

N1 - Funding Information: The authors would like to acknowledge financial support from the Army Research Office (D. Woolard, Contract No. W911NF-09-C-0097), the National Science Foundation (Grant Nos. MRSEC DMR-0820521, MRI DMR-0922937, DMR-0907475), the University of Nebraska-Lincoln, the J.A. Woollam Foundation, and the Office of Naval Research. J.L.T. acknowledges support from the American Society for Engineering Education-Naval Research Laboratory Postdoctoral Fellowship Program.

PY - 2011/1/24

Y1 - 2011/1/24

N2 - We report noncontact, optical determination of free-charge carrier mobility, sheet density, and resistivity parameters in epitaxial graphene at room temperature using terahertz and midinfrared ellipsometry and optical-Hall effect measurements. The graphene layers are grown on Si- and C-terminated semi-insulating 6H silicon carbide polar surfaces. Data analysis using classical Drude functions and multilayer modeling render the existence of a p -type channel with different sheet densities and effective mass parameters for the two polar surfaces. The optically obtained parameters are in excellent agreement with results from electrical Hall effect measurements.

AB - We report noncontact, optical determination of free-charge carrier mobility, sheet density, and resistivity parameters in epitaxial graphene at room temperature using terahertz and midinfrared ellipsometry and optical-Hall effect measurements. The graphene layers are grown on Si- and C-terminated semi-insulating 6H silicon carbide polar surfaces. Data analysis using classical Drude functions and multilayer modeling render the existence of a p -type channel with different sheet densities and effective mass parameters for the two polar surfaces. The optically obtained parameters are in excellent agreement with results from electrical Hall effect measurements.

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JF - Applied Physics Letters

IS - 4

M1 - 041906

ER -

Hole-channel conductivity in epitaxial graphene determined by terahertz optical-Hall effect and midinfrared ellipsometry

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