DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2011 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DS: Fachverband Dünne Schichten

DS 43: Poster II: Thin Film Chalcogenide Photovoltaics; Thermoelectric Materials, Thin Films, and Nanostructures

DS 43.8: Poster

Wednesday, March 16, 2011, 15:00–17:30, P2

A set-up for 3ω measurements on semiconductor nanowires and the role of electron-phonon decoupling — •Johannes Gooth1,2, Phillip Wu1, Sofia Fahlvik Svensson1, Johannes Kimling2, Kornelius Nielsch2, and Heiner Linke11Division of Solid State Physics, Lund University, Sweden — 2Applied Physics and Microstructure Research Center Hamburg, University of Hamburg, Germany

To characterise the performance of thermoelectric materials, the so called "figure of merit" ZT is an important value. We present a device for ZT measurements in semiconductor nanowires by using a microheater for the thermopower measurement and use of the the 3ω method to measure the thermal conductivity. A double-resist technique is used to suspend CBE-grown InAs nanowires wires above a substrate. Whereas near room temperature the 3ω method is very well established, questions arise about the coupling of electrons and phonons during the self-heating process at lower temperatures. To obtain a better understanding, we model the situation using a two temperature model, and we aim to compare our experimental results to a measurement method which is not based on self heating.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2011 > Dresden