p 型碲化铋基合金的性能优化及模块设计

In order to solve the challenge of low conversion efficiency limiting the development of power-dedicated sensorsof commercial thermoelectric materials, this article developed high-performance thermoelectric materials, proposed a strategy to optimize p-type bismuth telluride. By dopinghigh-concentration Yb into the Bi_0.4Sb_1.6Te₃ matrix, we systematically uncovered the structure-property relationships among doping concentration, micro-structural evolution and thermoelectric performance. The results show that the high-concentration Yb doping can not only control charge carrier of thermoelectric material, break the crystalline structure ofmaterial, but also induce the precipitation of nanoscale secondary phases containing Yb, Sb and Te. The low thermal conductivity (0.96 W/(m·K)) and high power factor (40 μW/(cm·K²)) of material achieves synergistic optimization, the thermoelectric figure of merit (Z_T) of material at 375 K reaches 1.34. The output power of 98-pair thermoelectric generator module fabricated based on this p-type bismuth telluride reaches 49 mW at temperature difference ΔT of 45 K, promoting 75% than that of the commercial materials. This technology provides a maintenance-free energy solution for power equipment condition monitoring sensors and offers critical technical support for self-powered passive sensors in power monitoring applications.