Absolute Seebeck coefficient of thin platinum films

The influence of size effects on the thermoelectric properties of thin platinum films is investigated and compared to the bulk. Structural properties, like the film thickness and the grain size, are varied. We correlate the electron mean free path with the temperature dependence of the electrical co...

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Bibliographic Details
Published in:arXiv.org 2019-03
Main Authors: Kockert, M, Mitdank, R, Zykov, A, Kowarik, S, Fischer, S F
Format: Article
Language:English
Subjects:
Electrical resistivity
Film thickness
Phonon drag
Phonons
Platinum
Seebeck effect
Size effects
Temperature
Temperature dependence
Thin films
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Summary:The influence of size effects on the thermoelectric properties of thin platinum films is investigated and compared to the bulk. Structural properties, like the film thickness and the grain size, are varied. We correlate the electron mean free path with the temperature dependence of the electrical conductivity and the absolute Seebeck coefficient \(S_{\text{Pt}}\) of platinum. We use a measurement platform as a standardized method to determine \(S_{\text{Pt}}\) and show that \(S_{\text{Pt,film}}\) is reduced compared to \(S_{\text{Pt,bulk}}\). Boundary and surface scattering reduce the thermodiffusion and the phonon drag contribution to \(S_{\text{Pt,film}}\) by nearly the same factor. A detailed discussion and a model to describe the temperature dependence of the absolute Seebeck coefficient and the influence of size effects of electron-phonon and phonon-phonon interaction on \(S_{\text{Pt}}\) is given.
ISSN:2331-8422
DOI:10.48550/arxiv.1903.12109