Raised solubility in SnTe by GeMnTe2 alloying enables converged valence bands, low thermal conductivity, and high thermoelectric performance
Raised solubility in SnTe by GeMnTe2 alloying enables converged valence bands, low thermal conductivity, and high thermoelectric performance
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GeMnTe2 合金化提高了 SnTe 的溶解度,可实现价带收敛、导热率低和热电性能高
DOI:
10.1016/j.nanoen.2022.106940
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发表时间:
2022-01
期刊:
影响因子:
17.6
通讯作者:
Jun Jiang
中科院分区:
文献类型:
--
作者:
Qiang Zhang;Ruoyu Wang;Kun Song;Xiaojian Tan;Haoyang Hu;Zhe Guo;Gang Wu;Peng Sun;Guo-Qiang Liu;Jun Jiang
SnTe is a promising alternative of the toxic PbTe, but the concepts of band engineering and thermoelectric performance optimization are restricted by the low solid solubility of effective dopants. Here, we demonstrate a raised Mn solubility limit of around 15% in the SnTe-GeMnTe2medium-entropy system. Density functional theory calculations show that high doping fraction of Mn gives rise to a near-complete valence band convergence that is responsible for the obviously improved Seebeck coefficient. High-content GeMnTe2alloying also profoundly creates multiscale microstructure for an extreme low lattice thermal conductivity. These effects yield a highZTmaxof 1.4 at 850 K and a record Vickers hardness of 1.65 GPa in (Sn0.96Sb0.04Te)0.7(Ge0.5Mn0.5Te)0.3. Stem from excellent thermoelectric and mechanical properties, the fabricated thermoelectric module comprised of ourp-type SnTe exhibits a conversion efficiency of 6.1% and an output power density of 0.43 W cm–2under a temperature gradient of 350 °C. This study opens the door for the development of SnTe-based modules, which is promising for the low-grade heat harvest at mid-low temperature.
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