[13p-N106-1~6] 22.1 Joint Session M "Phonon Engineering"

▲ [13p-N106-2] High-throughput Measurements of Thermoelectric Figure of Merit by Thermal Imaging Technique

〇(D)Abdulkareem ALASLI¹, Asuka MIURA², Ryo Iguchi², Hosei NAGANO¹, Ken-ichi UCHIDA^2,3,4 (1.Nagoya Univ., 2.NIMS, 3.IMR, Tohoku Univ., 4.CSRN, Tohoku Univ.)

Keywords:Lock-in thermography, Thermoelectric figure of merit, Magnetic field

The dimensionless figure of merit ZT is a well-known parameter for evaluating the performance of a thermoelectric material. High-throughput and versatile measurement of ZT and the associated thermoelectric properties can play a key role in accelerating the advancement in the field of thermoelectrics. In this research, we propose a new approach for measuring ZT using the noncontact thermal imaging by means of lock-in thermography (LIT). The method is based on the thermal analysis of the modulated temperature distributions induced by the Peltier effect and Joule heating, which enables the estimation of the thermal diffusivity D, thermal conductivity κ, Peltier coefficient Π (the corresponding Seebeck coefficient S), and consequently ZT of multiple materials simultaneously. The LIT-based method has high reproducibility and reliability since it provides sensitive noncontact temperature measurements without the need of an external heating source. This allows for systematic and high-throughput investigations of the thermal and thermoelectric properties of multiple materials with one apparatus. Moreover, the versatility of LIT allows extending the same measurements under an external magnetic field. Hence, the magnetic field dependence of ZT, and the associated Π (S) and κ (D) can be determined simultaneously, enabling the investigation of the magneto-thermoelectric effects.