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AKE: Arbeitskreis Energie
AKE 4: Renewable Energy - Photovoltaics and Electronic Processes
AKE 4.5: Vortrag
Montag, 16. März 2020, 16:15–16:30, DÜL
Impact of Interface Roughness on Thermal Transport in Half-Heusler Superlattices — •Sven Heinz1,2 and Gerhard Jakob1,2 — 1Institut für Physik, Uni Mainz, Deutschland — 2Graduate School of Excellence MAINZ, Mainz, Deutschland
In periodic multilayer structures a large portion of heat can be transported by so called ''coherent'' phonons [1]. The periodic multilayer structure leads to the formation of stop-bands: certain wavelength bands are suppressed for phonon transport, thereby potentially reducing thermal conductivity [2]. For these effects to be observed, the roughness of the interfaces has to be as low as possible [2].
Investigations will be presented on multilayer structures, in which the interface quality is purposefully deteriorated in part of the sample series by introducing an artificial intermixing layer. This is done by altering the layer sequence from ABAB to ACBCACBC, where C is a mixture of Material A and B. The thin intermixing layer simulates an increased interface roughness, thus destroying coherent transport. Additionally, the intermixing layer can act as a transition layer, lowering the acoustic contrast between the main layers A and B, acting as a so-called phonon bridge [3]. Both effects are discussed in the presentation.
[1] M.N. Luckyanova et al., Science 338 (2012) 936-939.
[2] M. Maldovan, Nat. Mater. 14 (2015) 667-674.
[3] P. Chakraborty et al., Sci. Rep. 7 (2017) 1-8.