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 42.31: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

Surface Photo Voltage and Local Work Function Variations of Nanostructures on Si(111) measured by STM — •Kristian Sell, Ingo Barke, Stefan Polei, Viola von Oeynhausen, and Karl-Heinz Meiwes-Broer — Universität Rostock, Institut für Physik, 18051 Rostock, Germany

We present surface photo voltage (SPV) and local work function (LWF) measurements of Si(111)5x2-Au atomic chains and deposited clusters on a Si(111)7x7 surface. Quantitative results are obtained from spatially resolved I(V) spectra. On a Si(111) surface partially covered by the quasi one-dimensional Si(111)5x2-Au structure we determine the SPV as a function of laser power at different locations. Based on these results we establish and discuss a simple model for the band bending which leads to LWF variations on a sub-nanometer scale. This model is confirmed by spatially resolved LWF measurements using I(Z) spectroscopy. In addition we present preliminary SPV measurements on clusters produced in an arc cluster ion source (ACIS) and deposited on Si(111)7x7.