Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 50: Poster II
HL 50.109: Poster
Donnerstag, 30. März 2006, 16:30–19:00, P3
Optical response of Ag-induced reconstructions on vicinal Si(111) — •Sandhya Chandola1, J Jacob1, K Fleischer1, P Vogt2, W Richter2, and J McGilp1 — 1Physics Department, University of Dublin, Trinity College, Dublin 2, Ireland — 2Technische Universität Berlin, Institut für Festkörperphysik, Sekr. PN 6-1, Hardenbergstr. 36, D-10623 Berlin, Germany
The optical response of the Si(111)-3x1-Ag surface has been studied for the first time with reflectance anisotropy spectroscopy (RAS). A single domain surface was obtained by depositing < 1 ML of Ag onto a vicinal Si(111) substrate at 870 K. A significant optical anisotropy develops around 2.2 eV which is related to the formation of the 3x1 structure. This surface was then used as a template to grow one-dimensional (1D) arrays of Ag nanodots, and also 3D Ag islands, by depositing 0.5 ML, and higher, coverages of Ag at room temperature. RAS of these structures showed a different response in the 2.2 eV region, with a broadened and reduced anisotropy. By extending the RA spectra into the infra-red region (0.5-1.5 eV), substantial differences between the structures were observed below 1 eV, which may be linked to a difference in the metallic character of the nanodots and islands.