Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Nanostructures at Surfaces: 1D and 2D Structures
O 73.5: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Tb induced surface structures on Si(001) — •Stephan Appelfeller1, Stefan Kuls1, Paul Reiß2, Tore Niermann2, Michael Lehmann2, and Mario Dähne1 — 1Institut für Festkörperphysik, TU Berlin, 10623 Berlin — 2Institut für Optik und Atomare Physik, TU Berlin, 10623 Berlin
Tb, a rare earth metal, induces a large variety of surface structures on Si(001) ranging from small surface clusters containing only few atoms over wire-like structures and metallic nanowires to large islands. Such structures are interesting for applications, e.g. the clusters might be used in catalysis, but the most promising ones are the metallic nanowires with widths of only few a nm and length exceeding 1µm, which may lead to a further miniaturization of semiconductor devices by using them as interconnects.
The surface structures were grown by Tb deposition and simultaneous or subsequent annealing. In-situ studies using scanning tunneling microscopy and low energy electron diffraction analysing the atomic structure in detail allowed the development of structure models for all observed surface structures.
Furthermore, the metallic nanowires were overgrown with amorphous Si and their cross sections were studied by high resolution transmission electron microscopy. The nanowires stayed intact upon overgrowth, and, using moderate annealing temperatures, they could even be embedded in crystalline Si. Possible structural modifications upon overgrowth will be discussed.
This work was supported by the DFG, FOR 1700, project E2.