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O: Fachverband Oberflächenphysik

O 3: Oxides and insulators I

O 3.3: Talk

Monday, March 23, 2009, 11:45–12:00, SCH A01

Interface formation and thin film growth of single crystalline Bi(111) on the NaCl(100) surface — •Thomas Payer, Frank Meyer zu Heringdorf, and Michael Horn-von Hoegen — Universität Duisburg-Essen, Duisburg, Germany

Starting from the clean and atomically flat NaCl(100) surface [1] we studied the interface formation and the thin film growth of Bi at room temperature using LEED, AFM and TED. The initial few layers of Bi grow layer by layer showing a diffraction pattern identical to the one observed from the clean NaCl surface indicating that the first nanameter of Bi grows in the NaCl lattice. Subsequently an epitaxial, (111)-oriented film grows on top of this wetting layers. Due to the nearly perfect 7:10 epitaxial ratio of lattice constants the film grows in domains up to micrometer size with a very low defect density and a roughness that can be reduced below 1nm rms by a short anneal at 100°C. Subsequent to film growth the free standing Bi membranes could be obtained by dissolving the NaCl substrate in water. Such membranes are mechanically stable down to 20 nm thickness.

[1] Appl. Phys. Lett. 93, 093102 (2008)