Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 59: Nanostructures at surfaces: 1D and 2D structures and networks I

O 59.3: Talk

Wednesday, March 14, 2018, 11:00–11:15, MA 141

Cobalt silicide nanostructures on planar and vicinal Si(111) surfaces — •Lars Freter, Martin Franz, Stephan Appelfeller, and Mario Dähne — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

The growth of transition metal silicides on Si(111) surfaces is interesting since they form various different nanostructures. Using Co is especially promising because Co silicide nanostructures range from small ring clusters over two-dimensional reconstructions, like the Si(111)√7× √7R19.1^∘-Co and the Si(111)√13× √13 R13.9^∘-Co, to three-dimensional islands and nanowires consisting of bulk silicides.

Here, the properties of these structures were investigated using scanning tunneling microscopy and spectroscopy as well as low energy electron diffraction. The samples were prepared using Co coverages between submonolayers and some monolayers and temperatures between 500 ^∘C and 900 ^∘C.

In order to force the formation of Co silicide nanowires instead of planar films, the vicinal Si(557) and Si(553) surfaces were also employed. Here, the formation of elongated, nanowire-like silicide islands is observed.