Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.51: Poster

Dienstag, 13. März 2018, 18:15–20:15, Poster B

Molecular Beam Deposition of thin YbzFeSb3 films on (001) oriented KCl — •Felix Timmermann and Manfred Albrecht — Universität Augsburg, Augsburg, Germany

Increasing interest in the development of alternative energy sources led to an extended research in the field of thermoelectricity. For a good efficiency of thermoelectric generators, there is a need of materials with special transport properties. The goal is to find compounds with a large Seebeck coefficient α, good electrical conductivity σ and low thermal conductivity κ. Skutterudites, such as FeSb3, are materials that meet those criteria well. The insertion of filler atoms like Yb increases the thermal stability and has the potential to increase to improve the thermoelectric properties further.

In this work the materials iron, antimony and ytterbium were thermally evaporated and deposited on heated (001) oriented KCl-substrates by molecular beam epitaxy in order to achieve epitaxial growth of thin YbzFeSb3 films. It could be shown that there is a strong dependence of the growth rate of antimony to the iron flux and the substrate temperature. Furthermore a drastic increase of the growth rates of iron and antimony with increasing ytterbium flux was observed. Structural characterization was carried out in situ by Reflection High-Energy Electron Diffraction and ex situ by X-Ray Diffraction and Transmission Electron Microscopy.