In Situ Reaction Induced Core-Shell Structure to Ultralow κlat and High Thermoelectric Performance of SnTe

Advanced Science
Sihui LiJunyou Yang

Abstract

Lead-free chalcogenide SnTe has been demonstrated to be an efficient medium temperature thermoelectric (TE) material. However, high intrinsic Sn vacancies as well as high thermal conductivity devalue its performance. Here, β-Zn4Sb3 is incorporated into the SnTe matrix to regulate the thermoelectric performance of SnTe. Sequential in situ reactions take place between the β-Zn4Sb3 additive and SnTe matrix, and an interesting "core-shell" microstructure (Sb@ZnTe) is obtained; the composition of SnTe matrix is also tuned and thus Sn vacancies are compensated effectively. Benefitting from the synergistic effect of the in situ reactions, an ultralow κlat ≈0.48 W m-1 K-1 at 873 K is obtained and the carrier concentrations and electrical properties are also improved successfully. Finally, a maximum ZT ≈1.32, which increases by ≈220% over the pristine SnTe, is achieved in the SnTe-1.5% β-Zn4Sb3 sample at 873 K. This work provides a new strategy to regulate the TE performance of SnTe and also offers a new insight to other related thermoelectric materials.

References

Sep 22, 2012·Nature·Kanishka BiswasMercouri G Kanatzidis
Aug 1, 2013·Proceedings of the National Academy of Sciences of the United States of America·Qian ZhangZhifeng Ren
Dec 25, 2013·Journal of the American Chemical Society·Jianping LinJu Li
May 3, 2014·Journal of the American Chemical Society·Gangjian TanMercouri G Kanatzidis
Aug 28, 2014·Physical Chemistry Chemical Physics : PCCP·Min ZhouG Jeffrey Snyder
Aug 27, 2015·Journal of the American Chemical Society·Gangjian TanMercouri G Kanatzidis
Feb 13, 2016·Journal of the American Chemical Society·Li-Dong ZhaoMercouri G Kanatzidis
Jul 28, 2016·Nature Communications·Gangjian TanMercouri G Kanatzidis

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Citations

Jun 18, 2021·Chemical Society Reviews·Yun ZhengMercouri G Kanatzidis
Jul 10, 2021·ACS Applied Materials & Interfaces·Wenjing XuLei Miao
Oct 15, 2021·ACS Applied Materials & Interfaces·Bang-Zhou TianZhi-Gang Chen

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Methods Mentioned

BETA
X‐ray

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