2018
DOI: 10.1063/1.5063419
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Non-linear impedance spectroscopy for complete thermoelectric characterization: Beyond the zT estimation

Abstract: Thermoelectric measurement of the dimensionless zT parameter requires multiple physical quantities to be measured, therefore there is great interest to find an experimental setup capable of measuring all these properties at once. Previous works on impedance spectroscopy have shown promising results in this direction, however, this technique does not lead to a complete characterization of the thermoelectric system without additional measurement. In order to extend impedance spectroscopy, we have investigated th… Show more

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Cited by 5 publications
(4 citation statements)
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“…5 Since the idea of using impedance spectroscopy for the characterization of TE materials and devices was born, 6 , 7 it has been proved to be useful for the determination of the figure of merit zT , 8 11 or even to perform a complete characterization of TE modules (determination of the ohmic resistance, the average Seebeck coefficient and thermal conductivity of the TE legs, and zT ) in suspended conditions if the thermal conductivity of the ceramics is known. 12 17 More recently, we have shown how to characterize the thermal contact resistance between the TE legs and the metallic strips. 18 In the latter study, we developed the most comprehensive equivalent circuit to date, which includes, among other key phenomena, the thermal contact resistance between the metallic strips and the outer layer.…”
Section: Introductionmentioning
confidence: 99%
“…5 Since the idea of using impedance spectroscopy for the characterization of TE materials and devices was born, 6 , 7 it has been proved to be useful for the determination of the figure of merit zT , 8 11 or even to perform a complete characterization of TE modules (determination of the ohmic resistance, the average Seebeck coefficient and thermal conductivity of the TE legs, and zT ) in suspended conditions if the thermal conductivity of the ceramics is known. 12 17 More recently, we have shown how to characterize the thermal contact resistance between the TE legs and the metallic strips. 18 In the latter study, we developed the most comprehensive equivalent circuit to date, which includes, among other key phenomena, the thermal contact resistance between the metallic strips and the outer layer.…”
Section: Introductionmentioning
confidence: 99%
“…To characterize thermoelectric devices, Harman's method and power output measurements have been widely used to evaluate the ZT values and thermoelectric power, respectively, but additional extensive measurements are necessary to determine the three key parameters ( , S, and ). Recently, several studies have demonstrated that impedance spectroscopy can be used to determine the ZT values of thermoelectric bismuth telluride [29] and SKD [30,31] materials as well as bismuth telluride [32][33][34][35][36][37][38] and SKD [39,40] based devices. In a typical galvanostatic impedance spectroscopy measurement, a sinusoidal current perturbation drives the thermoelectric system slightly out of temperature equilibrium (appearance of a temperature gradient), inducing reorganization of the carriers owing to the Peltier effect, which allows the Seebeck voltage to be measured as a function of frequency.…”
Section: Introductionmentioning
confidence: 99%
“…Most investigations using impedance spectroscopy for the characterization of bismuth telluride [29,32,34,35,38] and SKD [39,40] based thermoelectric devices have been performed at ambient temperature, with only a few studies reporting the properties of bismuth telluride based devices at operating temperatures up to 150 °C [33,37]. In this work, we employed impedance spectroscopy to elucidate the thermoelectric properties of an in-house-fabricated two-couple SKD-based device within the range of practical operating temperatures (23-450 °C) with the help of state-of-the-art mathematical models along with electrical, thermal, and microstructural characterization.…”
Section: Introductionmentioning
confidence: 99%
“…The method is based on the measurement of the impedance signal of a TE sample that is sandwiched by a material of known thermal conductivity. Although the application of impedance spectroscopy to thermoelectricity dates back from the 2000s, , this approach was proposed by us in 2014, and it has only been demonstrated to date in TE modules. Here, the approach is applied to a skutterudite material, for which complete TE characterization is achieved up to 250 °C (although with some deviations in σ at the higher temperatures). The results are compared with the values of the TE properties determined using commercially available equipment, and the random and systematic errors are calculated.…”
Section: Introductionmentioning
confidence: 99%