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Simulations for the Development of Thermoelectric Measurements

Zabrocki, Knud and Ziolkowski, Pawel and Dasgupta, Titas and de Boor , Johannes and Müller, Eckhard (2013) Simulations for the Development of Thermoelectric Measurements. Journal of Electronic Materials, 42 (7), pp. 2402-2408. Springer. DOI: 10.1007/s11664-013-2579-y ISSN 0361-5235

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Abstract

In thermoelectricity, continuum theoretical equations are usually used for the calculation of the characteristics and performance of thermoelectric elements, modules or devices as a function of external parameters (material, geometry, temperatures, current, flow, load, etc.). An increasing number of commercial software packages aimed at applications, such as COMSOL and ANSYS, contain vkernels using direct thermoelectric coupling. Application of these numerical tools also allows analysis of physical measurement conditions and can lead to specifically adapted methods for developing special test equipment required for the determination of TE material and module properties. System-theoretical and simulation-based considerations of favorable geometries are taken into account to create draft sketches in the development of such measurement systems. Particular consideration is given to the development of transient measurement methods, which have great advantages compared with the conventional static methods in terms of the measurement duration required. In this paper the benefits of using numerical tools in designing measurement facilities are shown using two examples. The first is the determination of geometric correction factors in four-point probe measurement of electrical conductivity, whereas the second example is focused on the so-called combined thermoelectric measurement (CTEM) system, where all thermoelectric material properties (Seebeck coefficient, electrical and thermal conductivity, and Harman measurement of zT) are measured in a combined way. Here, we want to highlight especially the measurement of thermal conductivity in a transient mode. Factors influencing the measurement results such as coupling to the environment due to radiation, heat losses via the mounting of the probe head, as well as contact resistance between the sample and sample holder are illustrated, analyzed, and discussed. By employing the results of the simulations, we have developed an improved sample head that allows for measurements over a larger temperature interval with enhanced accuracy.

Item URL in elib:https://elib.dlr.de/85807/
Document Type:Article
Title:Simulations for the Development of Thermoelectric Measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zabrocki, KnudGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Ziolkowski, PawelGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Dasgupta, TitasGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
de Boor , JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Müller, EckhardGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Date:1 May 2013
Journal or Publication Title:Journal of Electronic Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:42
DOI :10.1007/s11664-013-2579-y
Page Range:pp. 2402-2408
Publisher:Springer
ISSN:0361-5235
Status:Published
Keywords:Measurement of thermoelectric properties electrical resistivity/conductivity measurement error correction finite-element modeling ANSYS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Project Fahrzeugenergiesysteme III (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:27 Nov 2013 14:35
Last Modified:27 Nov 2013 14:35

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