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Low frequency impedance spectroscopy analysis of thermoelectric modules

Garcia Canadas, Jorge and Gao, Min 2014. Low frequency impedance spectroscopy analysis of thermoelectric modules. Journal of Electronic Materials 43 (6) , pp. 2411-2414. 10.1007/s11664-014-3095-4

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Abstract

Impedance spectroscopy is a well-established technique for the study of semiconductors and energy-related devices. However, in the area of thermoelectrics (TEs), this technique is not frequently used and there is a lack of a physical background for a proper interpretation of the results. Usually, in the low frequency regime, the impedance spectrum of TE modules working in cooling mode is characterized by a semicircle which can be modelled as a parallel connection of a resistor and a capacitor. Here, we present a theoretical analysis to understand the origin of both parameters in bulk TE modules working as Peltier coolers. The analysis introduces a thermoelectric capacitance and a thermoelectric resistance that are defined by the temperature, the Seebeck coefficient and the thermal properties of the module (specific heat and thermal conductivity, respectively). The product of both provides a time constant that directly relates to the thermal diffusivity. Our analysis provides a theoretical model able to interpret the low frequency results and obtain relevant thermal parameters from a single impedance measurement.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: Characterisation of thermoelectric modules; ac electrical impedance; thermal constants
Additional Information: Online publication date: March 2014. Post-print self-archived in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0361-5235/ (last accessed 25 April 2014).
Publisher: Springer
ISSN: 0361-5235
Date of First Compliant Deposit: 30 March 2016
Last Modified: 20 Feb 2019 17:15
URI: https://orca.cardiff.ac.uk/id/eprint/59194

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