Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Nanostructures at surfaces: Dots, particles, clusters

O 23.1: Vortrag

Dienstag, 23. März 2010, 10:30–10:45, H33

Surface Photovoltage of Ag Nanoparticles and Au Chains on Si(111) — •Kristian Sell, Ingo Barke, Stefan Polei, Viola von Oeynhausen, and Karl-Heinz Meiwes-Broer — Universität Rostock, Institut für Physik, 18051 Rostock

We present surface photo voltage (SPV) measurements of deposited Ag nanoparticles on Si(111)7x7 and of the quasi one-dimensional Si(111)5x2-Au structure. Quantitative results are obtained from spatially resolved I(V) spectra under laser illumination. On Si(111)5x2-Au we determine the SPV as a function of laser power at different locations. An accurate value for the Fermi-level pinning position is obtained. Based on these results we establish and discuss a simple model for the band topology. It is confirmed by spatially-resolved local work function measurements utilizing the image-state derived field emission resonances. These results have interesting implications on the electronic properties of metal nanostructures on semiconductors with metallic surface states.