Minimizing thermal conductivity in laser deposited multilayers
Modern materials featuring a minimized thermal conductivity are desired for a variety of applications such as thermal power storage, thermoelectricity, specialized thermal barrier coatings, or even solid state refrigeration. In fundamental research, a good approach towards such materials lies in the combination of metals and insulators in nanoscale thin films, which can be produced by Pulsed Laser Deposition (PLD). This versatile thin film method allows production of ultra-thin multilayer films, which can consist of metals, semiconductors, oxides and polymers enabling fabrication of material stacks with high a high number of interfaces between different materials with a high acoustic mismatch. This composition leads to our goal of a reduced thermal conductivity due to phonon scattering and reflection. In this work, predominantly multilayers consisting of W and ZrO2 respectively W and PC are pulsed laser deposited and carefully analyzed by electron microscopy, x-ray reflectometry and x-ray diffraction. Afterwards, the phonon dynamics in those materials are studied using fs-pump-probe reflectivity measurements. For the final investigation in thermal conductivity, a transient thermal reflectometry setup was implemented.
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Florian Döring (POC,Primary Presenter,Author), email@example.com;