Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.11: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
XPS studies of organosilanes attached to 6H-SiC(0001) — •Nabi Aghdassi1, Deb Kumar Bhowmick1, Steffen Linden1, Michael Hirtz1, André Devaux1,2, Lifeng Chi1,2, Luisa De Cola1,2, and Helmut Zacharias1,2 — 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster — 2CeNTech, Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster
Octadecyltrichlorosilane (OTS) represents an organic molecule which has gained much interest in respect of the formation of self-assembled monolayers on silicon dioxide substrates. Silicon carbide (SiC) is a semiconducting substrate well-suited to attach organic complexes due to its outstanding properties like a large bandgap, a high electron drift velocity and its non-toxicity. We have attached OTS molecules to the hydroxyl-terminated 6H-SiC(0001) surface via a wet chemical treatment. This system is studied by XPS. Before the functionalization of the surface the C1s region shows two peaks separated by about 2 eV. The peak with lower binding energy can be attributed to the carbidic component while the second one can be related to a silicon oxycarbide layer. After surface functionalization the peak with higher binding energy shows a large increase in intensity which can be explained by the attached alkyl chains. A covalent bonding of organosilanes with functional end groups may provide a linker for a further functionalization of the surface.