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Measuring the directional dependence of the properties that are important for thermoelectric materials

PhD defence, Monday 6 May 2019, Karl Frederik Færch Fischer.

2019.05.06 | Mie Meulengracht Christensen

Karl Frederik Færch Fischer

During his studies, Karl Frederik Færch Fischer researched methods for efficiently characterizing the anisotropy (i.e. directional dependence) of relevant properties for thermoelectric materials. Thermoelectric materials can interconvert heat and electricity though solid-state processes, meaning they have no moving parts and work at all size scales. Many of these materials exhibit anisotropy in their properties, which can be an important part of optimization for applications. This directional dependence is however rarely characterized, which can be ascribed to challenges in synthesizing samples that are large enough for anisotropic characterization with the standard methods. Karl developed two new methods for measuring the anisotropy of two of the relevant properties for thermoelectric materials, both of which enables characterization of the anisotropy with smaller samples.

The first method is for measuring the electrical resistivity anisotropy in the plane of flat samples and the second method is for measuring the anisotropy of the thermopower of single crystals. The developed methods are by design compatible with commonly used instruments making the methods are usable by many other research groups.

The PhD degree was completed at the Department of Chemistry, Science and Technology, Aarhus University.

This résumé was prepared by the PhD student.

Time: 13:15, Monday 6 May 2019
Place: iNANO Auditorium, 1593-012, Interdisciplinary Nanoscience Center, Gustav Wieds Vej 14, Aarhus University
Title of PhD thesis: Characterizing Anisotropic Thermoelectric Materials
Contact information: Karl Frederik Færch Fischer, e-mail: Karl@chem.au.dk, tel.: +45 5151 6952
Members of the assessment committee:
Professor Muhammet Toprak, Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, Sweden
Professor Eckhard Müller, Institute of Inorganic and Analytical Chemistry, DLR Institute of Materials Research, Germany
Professor Henrik Stapelfeldt (chair), Department of Chemistry, Aarhus University
Main supervisor:
Professor Bo Brummerstedt Iversen, Department of Chemistry and iNANO, Aarhus University
Language: The PhD dissertation will be defended in English

The defence is public.
The PhD thesis is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 118, building 1521, 8000 Aarhus C.

PhD defence
12183 / i43