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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 33.250 ) Pub Date : 2020/01/16 , DOI: 10.1039/c9ee03897c
Lisha Mao; Yinong Yin; Qiang Zhang; Guo-Qiang Liu; Hongxiang Wang; Zhe Guo; Haoyang Hu; Yukun Xiao; Xiaojian Tan; Jun Jiang

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.
更新日期:2020-02-19

 

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