Low frequency impedance spectroscopy analysis of thermoelectric modules

Garcia Canadas, Jorge and Gao, Min ORCID: https://orcid.org/0000-0001-9591-5825 2014. Low frequency impedance spectroscopy analysis of thermoelectric modules. Journal of Electronic Materials 43 (6) , pp. 2411-2414. 10.1007/s11664-014-3095-4

Preview

PDF - Accepted Post-Print Version Download (353kB) | Preview

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:	08 May 2023 06:40
URI:	https://orca.cardiff.ac.uk/id/eprint/59194

Citation Data

Cited 34 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item