Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 32: Graphene: Growth & intercalation (O with HL/TT)
HL 32.3: Vortrag
Dienstag, 17. März 2015, 11:00–11:15, MA 041
Comparing graphene growth on Cu(111) vs. oxidized Cu(111) — Stefano Gottardi1, Kathrin Müller1, Luca Bignardi1, Juan Carlos Moreno Lopez1, Tuan Anh Pham1, Alexei Barinov2, Jonas Björk3, Petra Rudolf1, and •Meike Stöhr1 — 1University of Groningen — 2Sincrotrone Trieste — 3Linköping University
The epitaxial growth of graphene on catalytically active metallic surfaces via chemical vapor deposition (CVD) is known to be one of the most reliable routes towards high quality large-area graphene. This CVD-grown graphene is generally coupled to its metallic support resulting in a modification of its intrinsic properties. Growth on oxides is a promising alternative that might lead to a decoupled graphene layer. Here, we compare graphene on a pure metallic to graphene on an oxidized copper surface, in both cases grown by a single step CVD process under similar conditions. Remarkably, the growth on copper oxide - a high-k dielectric material - preserves the intrinsic properties of graphene; it is not doped and a linear dispersion is observed close to the Fermi energy. Density functional theory calculations give additional insight into the reaction processes and help explaining the catalytic activity of the copper oxide surface.