Lead-free SnTe-based compounds as advanced thermoelectrics
Lead-free SnTe-based compounds as advanced thermoelectrics
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作为先进热电材料的无铅 SnTe 基化合物
DOI：
10.1016/j.mtphys.2021.100405
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发表时间：
2021-04
影响因子：
11.5
通讯作者：
Tan Gangjian
中科院分区：
文献类型：
--
作者：
Zhang Yu;Sun Jinchang;Shuai Jing;Tang Xinfeng;Tan Gangjian
热电材料能够实现热电之间的直接能量转换，在发电和珀尔帖冷却方面具有很大的潜力。SnTe是一种古老而有趣的中温热电材料，由于其无毒的化学元素以及独特的两价带（L和Σ带）电子结构，在过去的五年里引起了人们的广泛关注。然而，原始SnTe表现出较差的热电性能，主要是由于其固有的大量空穴作为电荷载流子，L和Σ能带之间的能量差大，晶格导热系数高。近年来，人们对SnTe输运系数进行了大量的优化研究，使其热电峰值值达到1.8以上。在这篇综述中，首先概述了SnTe的基本性质，然后总结了电子和声子输运的优化策略。最后，本文提出了进一步提高SnTe热电性能的可能方向。我们相信这一综述将激发人们探索其他IV-VI热电化合物的灵感。
Thermoelectric materials are able to realize the direct energy conversion between heat and electricity and have great potential in power generation and Peltier cooling. SnTe, an old but intriguing mid-temperature thermoelectric material, has attracted much attention in the past half-decade because of its non-toxic chemical elements as well as distinctive two-valence-bands (L and Σ bands) electronic structure. However, pristine SnTe shows inferior thermoelectric performance largely due to its intrinsically large population of holes as charge carriers, big energy difference between L and Σ bands and high lattice thermal conductivity. In recent years, numerous efforts have been carried out to optimize the transport coefficients of SnTe, endowing the peak thermoelectric figure of meritZTabove 1.8. In this review, the fundamental properties of SnTe are first outlined, and the optimization strategies are subsequently summarized for both electronic and phonon transport. Finally, future possible directions to further enhance the thermoelectric performance of SnTe are put forward at the end of this article. We believe that this review will spark people’s inspiration in exploring other IV-VI thermoelectric compounds.
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