Fermi-surface dynamics and high thermoelectric performance along the out-of-plane direction in n-type SnSe crystals,Energy & Environmental Science

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Fermi-surface dynamics and high thermoelectric performance along the out-of-plane direction in n-type SnSe crystals
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020/01/16 , DOI: 10.1039/c9ee03897c
Lisha Mao _{1,

2,

3,

4,

5} , Yinong Yin _{1,

2,

3,

4} , Qiang Zhang _{1,

2,

3,

4,

5} , Guo-Qiang Liu _{1,

2,

3,

4,

5} , Hongxiang Wang _{1,

2,

3,

4,

5} , Zhe Guo _{1,

2,

3,

4,

5} , Haoyang Hu _{1,

2,

3,

4} , Yukun Xiao _{1,

2,

3,

4} , Xiaojian Tan _{1,

2,

3,

4,

5} , Jun Jiang _{1,

2,

3,

4,

5}

Affiliation

The layered chalcogenide SnSe has attracted great interest for its remarkable ZT records. Here, we report the excellent thermoelectric performance of n-type SnSe single crystals by alloying with PbBr₂, where a maximum ZT of 2.1 at 770 K is achieved along the out-of-plane direction. Interestingly, we observed a sharp drop of the carrier mobility at PbBr₂ content x = 3%, which terminates the continuous increase of ZT from x = 0.5% to x = 2%. It is shown that the anomalous decrease is due to the evolution of the Fermi surface driven by the enlargement of the out-of-plane axis. When 1% Sn is substituted by Ge, the restoration of the Fermi surface increases the ZT for the x = 3% sample by 200%. This study reveals the crucial role of the Fermi-surface dynamics in n-type SnSe, and the consequent strategy is confirmed to be highly efficient in the optimization of thermoelectric performance.

中文翻译：

n型SnSe晶体沿面外方向的费米表面动力学和高热电性能

层状硫族化物SnSe以其卓越的ZT记录引起了人们的极大兴趣。在这里，我们报告了通过与PbBr ₂合金化形成的n型SnSe单晶的出色热电性能，其中沿平面外方向在770 K处获得的最大ZT为2.1。有趣的是，我们观察到在PbBr ₂含量x = 3％时载流子迁移率急剧下降，这终止了ZT从x = 0.5％到x的连续增加。= 2％。结果表明，异常减少是由于平面外轴的扩大驱动费米表面的演化。当1％的Sn被Ge取代时，费米表面的恢复使x = 3％的样品的ZT增加200％。这项研究揭示了费米表面动力学在n型SnSe中的关键作用，并且其结果被证明在优化热电性能方面非常有效。

更新日期：2020-02-19

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