Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.114: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
A study of the Cobalt Phthalocyanine-Ag-Si(111) interface — •Fei Song1,2, Justin Wells1,3, Zheshen Li1, Karsten Handrup1, Shining Bao2, Karina Schulte4, Louise Mayor4, Edward Perkins4, Janine Swarbrick4, Lauge Gammelgaard5, Marja Ahola-Tuomi6, and Philip Hofmann1 — 1University Aarhus, DK — 2Zhejiang University, Hangzhou, CN — 3Norwegian University of Science and Technology, Trondheim, N — 4University of Nottingham, UK — 5CARPES A/S, Kgs. Lyngby, DK — 6University of Turku, FI
We describe the electronic and structural properties of the interface between Cobalt phthalocyanine(CoPc) molecules and a Si(111) surface, which is passivated by a monolayer of silver. Different photoemission-based techniques such as valence band UPS, XPS and NEXAFS are used, and the system is also investigated using nano-scale four point probes. Valence band UPS indicates a stronger bonding for the first monolayer of molecules than for subsequent monolayers. This is accompanied by a structural change from flat-lying to standing. For thicker layers, we infer the charge transfer and band alignment. Finally, the thickness-dependent surface conductance is related to these observations.