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Surfactant-mediated epitaxial growth of single-layer graphene in an unconventional orientation on SiC

DOI: 10.1103/PhysRevLett.125.106102 DOI Help

Authors: F. C. Bocquet (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA)) , Y.-r. Lin (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA); RWTH Aachen University) , M. Franke (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA); RWTH Aachen University) , N. Samiseresht (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA); RWTH Aachen University) , S. Parhizkar (Forschungszentrum Jülich GmbH) , S. Soubatch (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA)) , T.-l. Lee (Diamond Light Source) , C. Kumpf (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA); RWTH Aachen University) , F. S. Tautz (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA); RWTH Aachen University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 125

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 17737 , 20810 , 20855

Abstract: We report the use of a surfactant molecule during the epitaxy of graphene on SiC(0001) that leads to the growth in an unconventional orientation, namely R 0 ° rotation with respect to the SiC lattice. It yields a very high-quality single-layer graphene with a uniform orientation with respect to the substrate, on the wafer scale. We find an increased quality and homogeneity compared to the approach based on the use of a preoriented template to induce the unconventional orientation. Using spot profile analysis low-energy electron diffraction, angle-resolved photoelectron spectroscopy, and the normal incidence x-ray standing wave technique, we assess the crystalline quality and coverage of the graphene layer. Combined with the presence of a covalently bound graphene layer in the conventional orientation underneath, our surfactant-mediated growth offers an ideal platform to prepare epitaxial twisted bilayer graphene via intercalation.

Journal Keywords: Graphene; Angle-resolved photoemission spectroscopy; Low-energy electron diffraction; Tight-binding model

Subject Areas: Materials, Physics


Instruments: I09-Surface and Interface Structural Analysis