Bi2Te3基热电材料的电输运性能研究进展

Bi₂Te₃基化合物是热电领域的代表性材料之一,被广泛应用于余热发电、固态制冷、温度探测等方面.该类材料具有复杂的能带结构,利用强自旋轨道和能带反转,有望对Bi₂Te₃基材料的热电性能实现优化.通过分析对比近些年Bi₂Te₃基材料的能带结构计算数据与部分实验结果,总结了Bi₂Te₃、N型Bi₂Te_3-xSe_x和P型Bi_2-xSb_xTe₃材料的能带结构的特点,影响能带结构以及电输运性能的关键因素.相关结论将为提高Bi₂Te₃基材料的热电性能提供依据.

Research progress of electrical transport properties of Bi2Te3-based thermoelectric materials

Bi₂Te₃-based compound is one of the representative materials in the field of thermoelectric(TE), which are widely used in waste heat power generation, solid-state refrigeration, temperature detection etc. Bi₂Te₃-based materials have complex band structures.It is expected that the TE performance of Bi₂Te₃-based materials can be optimized by strong spin orbit and band inversion.By analyzing and comparing the band structure calculation datas and some experimental results of Bi₂Te₃-based materials in recent years, the characteristics of the band structure of Bi₂Te₃, N-type Bi₂Te_3-xSe_x and P-type Bi_2-xSb_xTe₃materials, and the key factors affecting the band structure and the electrical transport performance are summarized. The conclusions will provide a theoretical support for improving the TE performance of Bi₂Te₃-based materials.