温差发电用BiCuSeO基热电材料的研究进展

BiCuSeO基热电材料由于具有较低的热导率和较高的Seebeck系数,热电性能优异,且原料储藏丰富、价格低廉、安全无毒,被认为是一种具有潜在应用前景的新型热电转换材料。首先介绍了BiCuSeO基材料的晶体结构、电子结构、热电性能等基本特征,随后综述了近年来国内外关于BiCuSeO基热电材料的研究进展,评述了提高其热电性能的手段,包括Na、Ag、Mg、Ca、Sr、Ba等低价元素掺杂,铜空位,双空位,带隙调整,晶粒细化,织构化和调制掺杂等。通过电热输运特性的协同调控,可使其ZT值从未掺杂样品的0.4左右提高到1.5。最后从实际应用的角度出发提出了今后BiCuSeO基热电材料的研究方向及研究重点。

Review of BiCuSeO-based Thermoelectric Materials for Thermoelectric Generation

BiCuSeO based thermoelectric material with low thermal conductivity, high Seebeck coefficients and excellent thermoelectric properties, rich raw material storage, safety and non-toxicity, are considered to be a novel thermoelectric conversion material with the potential application. We first introduced the basic characteristics of BiCuSeO based compounds such as the crystal structure, electronic structure and thermoelectric properties, then analyzed the preparation methods, and reviewed the means of improving their thermoelectric properties including the doping of low-valance elements such as Na, Ag, Mg, Ca, Sr, Ba, Cu deficiencies, dual vacancies, band gap tuning, grain refinement, texturing and modulation doping etc. The highest ZT value has been increased from ~0.4 to 1.5 by the co-regulation of the electric-thermal transport characteristics. Finally, the research direction for further improvement of the thermoelectric properties of BiCuSeO based materials is summarized.