We report on the fabrication and characterization of high-quality chemical vapor-deposited (CVD) bilayer graphene (BLG). In particular, we demonstrate that CVD-grown BLG can be detached mechanically from the copper foil by a hexagonal boron nitride (hBN) crystal after oxidation of the copper-to-BLG interface. Confocal Raman spectroscopy reveals an AB-stacking order of the BLG crystals and a high structural quality. From transport measurements on fully encapsulated hBN/BLG/hBN Hall bar devices, we extract charge carrier mobilities up to 180 000 cm2/(Vs) at 2 K and up to 40 000 cm2/(Vs) at 300 K, outperforming state-of-the-art CVD bilayer graphene devices. Moreover, we show an on-off ratio of more than 10 000 and a band gap opening with values of up to 15 meV for a displacement field of 0.2 V/nm in such CVD grown BLG.
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26 June 2017
Research Article|
June 28 2017
High mobility dry-transferred CVD bilayer graphene
Michael Schmitz;
Michael Schmitz
1
2nd Institute of Physics and JARA-FIT, RWTH Aachen University
, 52074 Aachen, Germany
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Stephan Engels;
Stephan Engels
1
2nd Institute of Physics and JARA-FIT, RWTH Aachen University
, 52074 Aachen, Germany
2
Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich
, 52425 Jülich, Germany
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Luca Banszerus;
Luca Banszerus
1
2nd Institute of Physics and JARA-FIT, RWTH Aachen University
, 52074 Aachen, Germany
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Kenji Watanabe
;
Kenji Watanabe
3
National Institute for Materials Science
, 1-1 Namiki, Tsukuba 305-0044, Japan
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Takashi Taniguchi;
Takashi Taniguchi
3
National Institute for Materials Science
, 1-1 Namiki, Tsukuba 305-0044, Japan
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Christoph Stampfer
;
Christoph Stampfer
1
2nd Institute of Physics and JARA-FIT, RWTH Aachen University
, 52074 Aachen, Germany
2
Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich
, 52425 Jülich, Germany
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Bernd Beschoten
Bernd Beschoten
1
2nd Institute of Physics and JARA-FIT, RWTH Aachen University
, 52074 Aachen, Germany
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Appl. Phys. Lett. 110, 263110 (2017)
Article history
Received:
April 06 2017
Accepted:
June 14 2017
Citation
Michael Schmitz, Stephan Engels, Luca Banszerus, Kenji Watanabe, Takashi Taniguchi, Christoph Stampfer, Bernd Beschoten; High mobility dry-transferred CVD bilayer graphene. Appl. Phys. Lett. 26 June 2017; 110 (26): 263110. https://doi.org/10.1063/1.4990390
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