Low Sound Velocity Contributing to the High Thermoelectric Performance of Ag(8)SnSe(6).

Low Sound Velocity Contributing to the High Thermoelectric Performance of Ag(8)SnSe(6).
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低声速有助于 Ag8SnSe6 的高热电性能

DOI:
10.1002/advs.201600196
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发表时间:
2016-11
期刊:
影响因子:
15.1
通讯作者:
Pei, Yanzhong
Pei, Yanzhong
中科院分区:
材料科学1区
文献类型:
--
作者:
Li, Wen;Lin, Siqi;Ge, Binghui;Yang, Jiong;Zhang, Wenqing;Pei, Yanzhong

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通过最小化晶格热导率来提高热电性能的传统策略主要集中在短平均自由程的声子散射上。在这里,我们展示了一种慢声子传播的设计,这是实现高性能热电性能的有效方法。以Ag 8 SnSe 6为例,它显示了已知热电半导体中最低的声速之一,发现晶格热导率在整个温度范围内低至0.2 W m-1 K-1。因此,在Nb掺杂材料中实现了峰值热电优值zT > 1.2和平均zT高达1.08,而不依赖于高热电功率因数。这项工作不仅证明了最小的晶格热导率,因此高zT的低声速的指导原则,但也argyrodite化合物作为有前途的热电材料与弱化学键和重的组成元素。
Conventional strategies for advancing thermoelectrics by minimizing the lattice thermal conductivity focus on phonon scattering for a short mean free path. Here, a design of slow phonon propagation as an effective approach for high‐performance thermoelectrics is shown. Taking Ag8SnSe6 as an example, which shows one of the lowest sound velocities among known thermoelectric semiconductors, the lattice thermal conductivity is found to be as low as 0.2 W m−1 K−1 in the entire temperature range. As a result, a peak thermoelectric figure of merit zT > 1.2 and an average zT as high as ≈0.8 are achieved in Nb‐doped materials, without relying on a high thermoelectric power factor. This work demonstrates not only a guiding principle of low sound velocity for minimal lattice thermal conductivity and therefore high zT, but also argyrodite compounds as promising thermoelectric materials with weak chemical bonds and heavy constituent elements.
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