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 41.8: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
STM study of Cu interaction with Pb/Si(111) surface at room and low temperatures. — •Pavel Shukrynau1,2, Marius Toader1, Michael Hietschold1, and Vladimir Chab2 — 1Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group. D-09107 Chemnitz, Germany. — 2Institute of Physics, Academy of Sciences of the Czech Republic. CZ 162 53, Prague, Czech Republic.
Upon evaporation of a small amount of Cu on the (rt3xrt3)R30-Pb/Si(111) and (1x1)-Pb/Si(111) surfaces at room temperature followed by annealing, new clusters of hexagonal shape are formed. These clusters have a protruded border and are found randomly distributed in the (rt3xrt3)R30-Pb phase or attached to (1x1)-Pb/Si(111) islands with one side. Some of them are agglomerated in bigger clusters of a complex shape. Annealing at higher temperatures induces Pb and Cu segregation in characteristic structures observed at Si surface with a single metal adsorption. Cu atoms agglomerate in quasi-5x5 phase and Pb atoms are found in the "mosaic" structure corresponding to 1/6 ML. The formation of the clusters may be the result of Pb-Cu interaction mediated with Si substrate. Cooling the surface down to 200 K leads to significant changes in the 1x1-Pb islands. The original structure dissipates into small domains of 3x3 nm in size partially keeping the Si(111)-c(5xrt3)-Pb reconstruction. The detailed inspection of this surface reveals a local ordering in a mosaic-like pattern.