The panoscopic approach to high performance thermoelectrics
The panoscopic approach to high performance thermoelectrics
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DOI：
10.1039/c3ee43099e
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发表时间：
2014-01-01
影响因子：
32.5
通讯作者：
Kanatzidis, Mercouri G.
中科院分区：
文献类型：
--
作者：
Zhao, Li-Dong;Dravid, Vinayak P.;Kanatzidis, Mercouri G.
本综述讨论了高性能块状热电材料的最新发展和当前研究，包括纳米结构、介观结构、能带排列、能带工程以及协同定义提高热电性能的关键策略。迄今为止，体热电材料的品质因数的显着提高要么来自于晶格热导率的降低，要么来自于功率因数的提高，或者两者兼而有之。在这里，我们总结了通过全尺度分层结构大幅降低晶格热导率、通过基体内电子结构工程大幅增强塞贝克系数以及通过基体/包含带排列控制载流子迁移率之间的关系，从而提高功率因数并降低晶格热导率。提出了实现这些效果的分层成分合金纳米结构的新概念。基于 PbTe 的系统。特别强调了 PbSe 和 PbS，其中已取得了惊人的进展。对未来可能策略的讨论旨在提高这些材料的热电品质因数。
This review discusses recent developments and current research in high performance bulk thermoelectric materials, comprising nanostructuring, mesostructuring, band alignment, band engineering and synergistically defining key strategies for boosting the thermoelectric performance. To date, the dramatic enhancements in the figure of merit achieved in bulk thermoelectric materials have come either from the reduction in lattice thermal conductivity or improvement in power factors, or both of them. Here, we summarize these relationships between very large reduction of the lattice thermal conductivity with all-scale hierarchical architecturing, large enhanced Seebeck coefficients with intra-matrix electronic structure engineering, and control of the carrier mobility with matrix/inclusion band alignment, which enhance the power factor and reduce the lattice thermal conductivity. The new concept of hierarchical compositionally alloyed nanostructures to achieve these effects is presented. Systems based on PbTe. PbSe and PbS in which spectacular advances have been demonstrated are given particular emphasis. A discussion of future possible strategies is aimed at enhancing the thermoelectric figure of merit of these materials.