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O: Fachverband Oberflächenphysik

O 72: Graphene: Adsorption, Intercalation and Doping

O 72.3: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Initial stages of hydrogen intercalation of epitaxial graphene studied by XPS and LEEM — •Julia Krone, Florian Speck, Felix Fromm, Martina Wanke, and Thomas Seyller — TU Chemnitz, Institut für Physik, Reichenhainer Straße 70, 09126 Chemnitz, Germany

During graphitization of SiC(0001) surfaces, a buffer layer (BL) is formed at the interface between graphene and the substrate. The BL is a graphene-like layer covalently bound to the SiC [1]. Hydrogen intercalation underneath the BL has been shown to decouple it from the substrate, thus converting it into quasi-freestanding monolayer graphene (QFMLG) [2]. This modification of the interface results in improved charge carrier mobility as compared to regular epitaxial graphene on SiC [3], making it an interesting material for electronic applications. Investigation of short-time annealing of the BL in molecular hydrogen could help to elucidate the initial stages of hydrogen intercalation and BL decoupling. In this work, we employ a combination of X-ray photoelectron spectroscopy, low-energy electron microscopy and low-energy electron diffraction to study the onset of QFMLG formation.

[1] K. V. Emtsev et al., Phys. Rev. B 77, 155303 (2008).

[2] C. Riedl et al., Phys. Rev. Lett. 103, 246804 (2009).

[3] F. Speck et al., Appl. Phys. Lett. 99, 122106 (2011).