Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.67: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Initial stages of the graphite/SiC interface formation studied by photoelectron spectroscopy — •K. Emtsev1, Th. Seyller1, L. Ley1, L. Broekman2, J.D. Riley2, and R.G.C. Leckey2 — 1Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen — 2Department of Physics, La Trobe University, Bundoora, Victoria 3083, Australia
Nowadays graphite layers grown on SiC(0001) surface are widely accepted as an alternative to the samples of natural graphite. Single-crystalline graphite multilayers result from the decomposition of SiC upon annealing at high temperatures. As an initial stage of graphitization a complex (6√3×6√3)R30∘ surface reconstruction occurs after annealing of 6H-SiC(0001) at T=1150∘C. The nature of this reconstruction is discussed controvercially. Fingerprints of graphitization (π* and σ* bands) were observed in inverse photoelectron spectroscopy [1], while the energies of C1s surface shifted components differ from that of graphite [2]. The early models suggested a monolayer of graphite on top of either the unreconstructed surface or the (√3×√3)R30∘ reconstructed surface. The latest model proposes that the surface is covered by the graphene-like islands arranged in a honeycomb structure [3]. In the present work we analyze in detail the electronic structure of the 6√3 reconstructed surface of 6H-SiC(0001) by means of angle-resolved photoelectron spectroscopy.
[1] I. Forbeaux et al., Phys. Rev. B, 58 16396 (1998)
[2] L.I. Johansson et al., Phys. Rev. B, 53 13793 (1996)
[3] W.Chen et al., Surf.Sci., in press (2005)