Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 42: Thermoelectric Materials
DS 42.1: Vortrag
Donnerstag, 3. April 2014, 15:00–15:15, CHE 89
Thermoelectric Property Modification in Hybrid Semiconducting/Metal Superlattices and Local Characterization by SThM — •Guodong Li1,2, Daniel Grimm1,2, and Oliver. G Schmidt1,2 — 1Institute for Integrative Nanosciences, IFW Dresden, Germany — 2Technische Universität Chemnitz, Material Systems for Nanoelectronics, Germany
Nanostructured materials show great promising applications in thermoelectric industry not only owing to their intrinsic quantum confinement effects but also related to the enhanced boundary or interface scattering to phonon transport. The ideal modified thermoelectric structures should have much decreased thermal conductivity while keeping thermal power unaffected or even enhanced. Here, we combine the self-rolling and compressing technique to demonstrate a straight forward route to make hybrid superlattices consisting of a large number of nanomembranes that are mechanically stacked on top of each other. Depending on what kind of material we choose as the interfacial layer, we have successfully fabricated superlattices composed of different kinds of hybrid interfaces. Together with conventional time-domain thermoreflectance (TDTR) method that shows the cross-plane thermal conductivity of as-fabricated superlattice being nearly two orders of magnitude smaller than the thin film, we also characterize the local thermal transport property by using scanning thermal microscopy (SThM) technique. By taking the standard thermal samples as references, we are purposing to develop a quantitative model to characterize the cross-plane thermal transport property of fabricated superlattices.