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- Title
Direct Comparison of Thermoelectric Devices Using Impedance Spectroscopy.
- Authors
CHUNG-YUL YOO; HANA YOON; SANG HYUN PARK
- Abstract
The thermoelectric properties of devices based on bismuth telluride, skutterudite, and calcium manganese oxide have been investigated and compared using impedance spectroscopy at 23°C. Prior to the detailed analysis, Kramers-Kronig transformation tests were performed to examine the validity of the obtained impedance spectra. All the spectra were Kramers-Kronig transformable, and were interpreted using equivalent circuit fitting. The three key parameters (Seebeck coefficient, thermal conductivity, and electrical conductivity) and dimensionless figure of merit of bismuth telluride and skutterudite-based devices were successfully extracted from their respective impedance spectra. However, the thermal conductivity of the calcium manganese oxide-based device was overestimated, while the Seebeck coefficient and electrical conductivity values were reasonably accurate owing to their negligible thermoelectric effect at 23°C. We further proposed that the thermoelectric capacitance obtained from the impedance spectra could be a quantitative measure of the "propensity" of thermoelectric devices to generate thermoelectric power under an external temperature gradient.
- Subjects
THERMOELECTRIC materials; IMPEDANCE spectroscopy; BISMUTH telluride; SKUTTERUDITE; KRAMERS-Kronig relations
- Publication
Journal of Electronic Materials, 2019, Vol 48, Issue 4, p1833
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-018-6777-5