Study of development of Heusler-type functional materials for high performance thermoelectric thin films

为了将热电材料应用于发电，希望将热电功率因数的峰值温度提高到例如600 K及以上。fe2val基热电材料的缺点是热电功率因数峰值温度< 400k，导热系数高。为了提高fe2val基合金的热电性能，我的五年研究计划的目标是探索新的掺杂和取代元素，并阐明其热电性能改善的机制。结果表明：1)制备了非化学计量型Fe2V1+xAl1-x和四元素掺杂型Fe2VAl1-yTay合金，改善了Heusler Fe2VAl合金的热电性能。2)澄清了Heusler Fe2VAl合金热电性能的改善。3)开发了用于制备Fe2VAl薄膜的薄膜沉积系统。

For the application of thermoelectric materials to power generation, it is desirable to shift the peak temperature of the thermoelectric power factor up to, e.g., 600 K and above. The disadvantages of Fe2VAl-based thermoelectric materials are a peak temperature of the thermoelectric power factor of <400 K and a high thermal conductivity value. To improve the thermoelectric properties of the Fe2VAl-based alloys, the aims of my five-year research project were to explore new doping and substitution elements, and clarify the mechanism by which their thermoelectric properties are improved. The results are:1) Improvement of the thermoelectric properties of the Heusler Fe2VAl alloys due to the fabrication of the off-stoichiometric type Fe2V1+xAl1-x and fourth-element doping type Fe2VAl1-yTay alloys. 2) Clarification of the improvement of the thermoelectric properties of the Heusler Fe2VAl alloys. 3) Development of a thin- film deposition system for the fabrication of Fe2VAl thin films.