Development of apparatus for evaluation of figure of merit of thermoelectric devices

S. Kwon1, Y. Kim1 and S. Lee1

1Korea Research Instititue of Standards and Science, Korea

Keywords: thermoelectric properties
property: Seebeck coefficient, thermal conductivity, electrical conductivity
material: thermoelectric materials

The apparatus for evaluation of the figure of merit (ZT) of thermoelectric devices has been developed. ZT values have been estimated for thermoelectric materials and commercial devices in order to investigate the performance of the devices. ZT value is comprised of three physical quantities, Seebeck coefficient, electrical conductivity, and thermal conductivity. However, to date, the ZT values of the thermoelectric devices have been evaluated by Harman method due to difficulty in measuring thermal conductivity of the devices with high accuracy. In this study, we present new apparatus developed for evaluating the thermoelectric figure of merit of devices by direct measurement of thermal conductivity using guarded hot plate method. And we will present the measured values of ZT and power generation efficiency of the thermoelectric devices.

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