Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Poster Session I
DS 36.80: Poster
Donnerstag, 19. März 2015, 09:30–12:00, Poster A
Calculation and Measurement of the Transport Parameters of FexCo1−xSb3 Skutterudite Thin Films — •Felix Timmermann1, Marcus V. Daniel2, Ayham Dalla2, and Manfred Albrecht1 — 1Institute of Physics, University of Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany — 2Institute of Physics, Technische Universität Chemnitz, 09107 Chemnitz, 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, good electrical conductivity and low thermal conductivity. Skutterudites, such as CoSb3, are materials that meet those criteria well. Substituting Fe with Co gradually could improve the properties further.
In this work, the transport parameters of FexCo1−xSb3 have been calculated with equations derived from the Boltzmann equation. Under the assumption that the substitution of Co-atoms with iron acts as p-doping of CoSb3, the electrical conductivity and the Seebeck coefficient were simulated for different values of the Fermi level.
For comparison 30 nm thick thin FexCo1−xSb3-films were deposited at room temperature by molecular beam deposition and post-annealed in vacuum at 450 ∘C. The substitution level x was varied from 0 to 0.7. The electrical conductivity and the Seebeck coefficient of these films have been measured and show good agreement with the theoretical results.