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
中科院分区:
文献类型:
--
作者:
Li, Wen;Lin, Siqi;Ge, Binghui;Yang, Jiong;Zhang, Wenqing;Pei, Yanzhong
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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