Regensburg 2019 – wissenschaftliches Programm
HL 45.28: Poster
Donnerstag, 4. April 2019, 18:30–21:00, Poster E
Construction and Application of an Apparatus to Measure the Seebeck-Effect in Modulation Doped Semiconductors — •Timo Kruck, Arne Ludwig, and Andreas D. Wieck — Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, D-44780 Bochum
Most processes (for instance information processing, power generation and power conversion) don’t perform at maximum possible efficiency. The resulting waste heat can be converted into electric energy using thermoelectric generators even from a very small temperature gradient. This is called Seebeck-Effect. Today they only offer a small efficiency, that is represented by the “Figure of Merit”, ZT= S2 σ T /κ, but offer a wide range of other benefits, like reliability and scalability. S is the Seebeck-coefficient, σ is the electrical conductivity and κ the thermal conductivity. For this work an apparatus to measure the Seebeck-Effect in semiconductors was constructed and with that the influence of a few parameters (for instance the type of doping, the charge-carrier mobility and density, and the specific heterostructure) on the Seebeck-Coefficient S will be analyzed. Experimentally we use a single thermocouple to locally heat the sample, measure the local temperature and the resulting thermovoltage in the sample.