Engineering Thermoelectric Performance of α-GeTe by Ferroelectric Distortion

Yuting Fan , Chenghao Xie , Jun Li , Xiangyu Meng , Jinchang Sun , Jinsong Wu , Xinfeng Tang , Gangjian Tan

Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (2) : 12535

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Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (2) :12535 DOI: 10.1002/eem2.12535
RESEARCH ARTICLE

Engineering Thermoelectric Performance of α-GeTe by Ferroelectric Distortion

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Abstract

The rhombohedral α-GeTe can be approximated as a slightly distorted rock-salt structure along its [1 1 1] direction and possesses superb thermoelectric performance. However, the role of such a ferroelectric-like structural distortion on its transport properties remains unclear. Herein, we performed a systematic study on the crystal structure and electronic band structure evolutions of Ge1-xSnxTe alloys where the degree of ferroelectric distortion is continuously tuned. It is revealed that the band gap is maximized while multiple valence bands are converged at x = 0.6, where the ferroelectric distortion is the least but still works. Once undistorted, the band gap is considerably reduced, and the valence bands are largely separated again. Moreover, near the ferro-to-paraelectric phase transition Curie temperature, the lattice thermal conductivity reaches its minima because of significant lattice softening enabled by ferroelectric instability. We predict a peak ZT value of 2.6 at 673 K in α-GeTe by use of proper dopants which are powerful in suppressing the excess hole concentrations but meanwhile exert little influence on the ferroelectric distortion.

Keywords

electronic band structures / ferroelectric distortion / lattice softening / thermoelectric / α-GeTe

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Yuting Fan, Chenghao Xie, Jun Li, Xiangyu Meng, Jinchang Sun, Jinsong Wu, Xinfeng Tang, Gangjian Tan. Engineering Thermoelectric Performance of α-GeTe by Ferroelectric Distortion. Energy & Environmental Materials, 2024, 7(2): 12535 DOI:10.1002/eem2.12535

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