Electronic structure and thermoelectric properties of PbTe1−xSex from first-principles calculations

Electronic structure and thermoelectric properties of PbTe1−xSex from first-principles calculations
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第一性原理计算的 PbTe1âxSex 的电子结构和热电性质

DOI:
10.1016/j.commatsci.2019.109404
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发表时间:
2020-02
影响因子:
3.3
通讯作者:
Guang-hui Rao
Guang-hui Rao
中科院分区:
材料科学3区
文献类型:
--
作者:
Gang Zhou;Guang-hui Rao

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利用密度泛函理论和Boltzmann输运方程在常数弛豫时间近似下研究了一系列PbTe 1 − xSex固溶体的电子结构和热电输运性质.系统地研究了能带结构随硒浓度的变化。研究发现,p型PbTe 1 − xSex固溶体的Seebeck系数和功率因子随着Se浓度的增加而不断减小,这主要是由于Se浓度越高,价带边缘附近的态密度越平坦。详细讨论了热电输运系数与载流子浓度和温度的关系。我们的研究为今后寻找高效p型PbTe 1 − xSex固溶体的实验提供了指导。
Electronic structures and thermoelectric transport properties of a series of PbTe1−xSexsolid solutions have been investigated using density functional theory and Boltzmann transport equation with constant relaxation time approximation. The evolution of the band structure with the variation of Se concentration has been studied systematically. It has been found out that the Seebeck coefficients and power factors of p-type PbTe1−xSexsolid solutions decrease continuously with increasing Se concentration, which is mainly due to the higher the Se concentration, the flatter the density of states near the edge of the valence band. The dependence of the thermoelectric transport coefficients on carrier concentration and temperature was discussed in detail. Our studies provide a guidance for future experiments to search high-efficiency p-type PbTe1−xSexsolid solutions.
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