Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H-SiC(0001)

J. Sforzini; L. Nemec; T. Denig; B. Stadtmüller; T.-L. Lee; C. Kumpf; S. Soubatch; U. Starke; Patrick Rinke; V. Blum; F.C. Bocquet; F.S. Tautz

doi:10.1103/PhysRevLett.114.106804

Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H-SiC(0001)

J. Sforzini, L. Nemec, T. Denig, B. Stadtmüller, T.-L. Lee, C. Kumpf, S. Soubatch, U. Starke, Patrick Rinke, V. Blum, F.C. Bocquet, F.S. Tautz

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Abstract

We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of 6H silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full (63√×63√)−R30° unit cell, based on a van der Waals corrected exchange correlation functional, finds a purely physisorptive adsorption height in excellent agreement with experiments, a very low buckling of the graphene layer, a very homogeneous electron density at the interface, and the lowest known adsorption energy per atom for graphene on any substrate. A structural comparison to other graphenes suggests that hydrogen-intercalated graphene on 6H−SiC(0001) approaches ideal graphene.

Original language	English
Article number	106804
Pages (from-to)	1-6
Journal	Physical Review Letters
Volume	114
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.114.106804
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

Keywords

DFT
graphene
intercalated
silicon carbide
x-ray standing wave

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10.1103/PhysRevLett.114.106804

PhysRevLett.114Final published version, 604 KB

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Sforzini, J., Nemec, L., Denig, T., Stadtmüller, B., Lee, T.-L., Kumpf, C., Soubatch, S., Starke, U., Rinke, P., Blum, V., Bocquet, F. C., & Tautz, F. S. (2015). Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H-SiC(0001). Physical Review Letters, 114(10), 1-6. Article 106804. https://doi.org/10.1103/PhysRevLett.114.106804

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abstract = "We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of 6H silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full (63√×63√)−R30° unit cell, based on a van der Waals corrected exchange correlation functional, finds a purely physisorptive adsorption height in excellent agreement with experiments, a very low buckling of the graphene layer, a very homogeneous electron density at the interface, and the lowest known adsorption energy per atom for graphene on any substrate. A structural comparison to other graphenes suggests that hydrogen-intercalated graphene on 6H−SiC(0001) approaches ideal graphene.",

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AU - Sforzini, J.

AU - Nemec, L.

AU - Denig, T.

AU - Stadtmüller, B.

AU - Lee, T.-L.

AU - Kumpf, C.

AU - Soubatch, S.

AU - Starke, U.

AU - Rinke, Patrick

AU - Blum, V.

AU - Bocquet, F.C.

AU - Tautz, F.S.

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AB - We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of 6H silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full (63√×63√)−R30° unit cell, based on a van der Waals corrected exchange correlation functional, finds a purely physisorptive adsorption height in excellent agreement with experiments, a very low buckling of the graphene layer, a very homogeneous electron density at the interface, and the lowest known adsorption energy per atom for graphene on any substrate. A structural comparison to other graphenes suggests that hydrogen-intercalated graphene on 6H−SiC(0001) approaches ideal graphene.

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KW - intercalated

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KW - x-ray standing wave

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KW - intercalated

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KW - x-ray standing wave

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KW - intercalated

KW - silicon carbide

KW - x-ray standing wave

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DO - 10.1103/PhysRevLett.114.106804

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Approaching Truly Freestanding Graphene: The Structure of Hydrogen-Intercalated Graphene on 6H-SiC(0001)

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