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P-형 Skutterudite 소재의 고온 열전물성 제어를 위한 공정 개발
류붕거,노창완,최순목,Liu, Peng Ju,Nou, Chang Wan,Choi, Soon-Mok 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.6
Power factor improvement at high temperatures has been a major research topic for the development of skutterudite thermoelectric materials. Here, we attempted to optimize the process parameters for manufacturing skutterudite materials, especially for p-type systems. We focused on the effect of aging time variation to maximize the high-temperature performance of the Ce-filled Fe<sup>3</sup>CoSb<sup>12</sup> skutterudite system. The optimized aging time was concluded to be a key parameter for the formation of single-phase nanostructures in this p-type skutterudite system. The optimized condition was effective in reducing the bipolar effect at high temperature ranges by increasing the carrier concentration in the p-type system. To confirm the conclusions, the electrical conductivity, Seebeck coefficient, and power factor were measured. The results matched well with the microstructure and with those of an XRD analysis performed for the system.