High thermoelectric performance of tellurium-free n-type AgBi1-xSbxSe2 with stable cubic structure enabled by entropy engineering
High thermoelectric performance of tellurium-free n-type AgBi1-xSbxSe2 with stable cubic structure enabled by entropy engineering
复制标题
通过熵工程实现具有稳定立方结构的无碲n型AgBi1-xSbxSe2的高热电性能
DOI：
10.1016/j.actamat.2021.117291
复制
发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Zhou Xiaoyuan
中科院分区：
文献类型：
--
作者：
Zhao Ting;Zhu Huaxing;Zhang Bin;Zheng Sikang;Li Nanhai;Wang Guiwen;Wang Guoyu;Lu Xu;Zhou Xiaoyuan
AgBiSe 2是一种具有良好热电性能的n型化合物，但存在多重结构相变。在这里，我们表明，高温岩盐相可以稳定在AgBi 1-xSbxSe 2固溶体在环境条件下，当x大于0.2，这是由于增加的组态熵。通过对加权迁移率和质量因子的分析，确定了最佳构型熵增量。最后，受益于固有的低晶格热导率和良好的载流子迁移率，在790 K时，达到0.86的峰值ZT值立方AgBi 0.8Sb 0.2Se 2溴掺杂后。这项工作突出了熵工程在热电性能和相稳定性方面的重要性，为环境友好型热电材料的发现和设计提供了见解。
AgBiSe2is a promisingn-type compound with high thermoelectric performance but suffers from a multiple structural phase transition. Here, we show the high-temperature rock salt phase can be stabilized at ambient conditions in AgBi1-xSbxSe2solid solutions withxhigher than 0.2, which is attributed to the increased configurational entropy. Moreover, the optimum increment of configurational entropy is determined by analyzing the weighted mobility and quality factor. Finally, benefiting from the intrinsically low lattice thermal conductivity and well-maintained carrier mobility, a peakzTvalue of 0.86 at 790 K, is attained for cubic AgBi0.8Sb0.2Se2after bromine doping. This work highlights the importance of entropy engineering in thermoelectric performance and phase stability, providing insights into the discovery and design of environmental-friendly thermoelectrics.