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Atomic and Electronic Structure of Metal Silicide Clusters on Silicon Surfaces

STM images at different polarities and structure model of the Dy ring cluster structure on Si(111) with 2?3x2?3 periodicity, with Si atoms (yellow) and Dy atoms (blue).

In order to bridge the gap from doped silicon clusters in the gas phase to cluster-related devices, this project addresses metal silicide clusters grown on silicon surfaces. Such structures may act as building blocks for future larger-scale applications. The clusters will be prepared in ultra-high vacuum (UHV) by self-organization using molecular beam epitaxy (MBE), and their atomic structure and individual electronic properties will be studied using scanning tunneling microscopy (STM) and spectroscopy (STS). Different cluster structures are expected to form, depending on the preparation conditions such as substrate orientation, exposure, or growth and annealing temperature. Special emphasis lies on the atomic structure within the clusters, a possibly ordered arrangement in one- or two-dimensional superlattices, and the spatially
resolved study of their electronic states. In cooperation Raman experiments are planned using a mobile UHV transfer, being also used for studies of cluster and fullerene samples from collaborating projects.

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Prof. Dr. Mario Dähne
Hardenbergstr. 36
Raum EW 4-1, Room 449/450