Enhanced thermoelectric performance of hydrothermally synthesized polycrystalline Te-doped SnSe
Enhanced thermoelectric performance of hydrothermally synthesized polycrystalline Te-doped SnSe
复制标题
水热合成多晶掺碲 SnSe 的热电性能增强
DOI：
10.1016/j.cclet.2020.04.046
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发表时间：
2021
影响因子：
9.1
通讯作者：
Wan Jiang
中科院分区：
文献类型：
--
作者：
Pei Li;Xin Ai;Qihao Zhang;Shijia Gu;Lianjun Wang;Wan Jiang
本研究采用水热法合成了大尺寸的Te掺杂SnSe多晶纳米粉体，并研究了Te掺杂对SnSe热电性能的影响。结果表明，Te合金化降低了带隙，使载流子浓度增加，特别是室温下的电导率显著提高。结合适度的Seebeck系数，在773 K下获得了4.59 μW cm−1K− 2的高功率因数。此外，晶格热导率大大降低后Te取代由于原子点缺陷散射。受益于协同优化的电和热输运性能的Te掺杂，热电性能的多晶SnSe的增强，在整个温度范围内的最大ZT的0.79在一个相对较低的温度（773 K）的SnSe0.85Te0.15。本研究为高热电性能SnSe的大规模制备提供了一种低成本、简单的低温制备方法，具有实际应用价值
In this study, large-scale Te-doped polycrystalline SnSe nanopowders were synthesized by a facile hydrothermal approach and the effect of Te doping on the thermoelectric properties of SnSe was fully investigated. It is found that the carrier concentration increases due to the reduction of band gap by alloying with Te, which contributes to significant enhancement of electrical conductivity especially at room temperature. Combined with the moderated Seebeck coefficient, a high power factor of 4.59 μW cm−1K−2is obtained at 773 K. Furthermore, the lattice thermal conductivity is greatly reduced upon Te substitution owing to the atomic point defect scattering. Benefiting from the synergistically optimized both electrical- and thermal-transport properties by Te-doping, thermoelectric performance of polycrystalline SnSe is enhanced in the whole temperature range with a maximumZTof ∼0.79 at a relatively low temperature (773 K) for SnSe0.85Te0.15. This study provides a low-cost and simple low-temperature method to mass production of SnSe with high thermoelectric performance for practical applications