Enhanced thermoelectric performance of hot-press Bi-doped n-type polycrystalline PbS
Enhanced thermoelectric performance of hot-press Bi-doped n-type polycrystalline PbS
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DOI：
10.1016/j.mssp.2020.105393
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发表时间：
2021
影响因子：
4.1
通讯作者：
Yihuai Li;Zihua Wu;Jinhao Lin;Yuanyuan Wang;Jianhui Mao;Huaqing Xie;Zhen Li
中科院分区：
文献类型：
--
作者：
Yihuai Li;Zihua Wu;Jinhao Lin;Yuanyuan Wang;Jianhui Mao;Huaqing Xie;Zhen Li
硫化铅(PbS)是一种天然丰度高的元素组成的热电材料，具有广阔的应用前景。然而，与PbTe相比，PbS具有较高的晶格热导率，其相对较低的转换效率限制了其进一步的应用。人们普遍认为，纳米结构和掺杂是提高热电性能的有效途径。本文采用一种简便的水热合成方法合成了纳米/微米结构的掺铋PbS材料。纳米/微结构材料系统存在丰富的界面，可以有效地散射中低频声子，结合点缺陷如BiPb散射高频声子，结果表明PbS的晶格热导率随Bi3+掺杂浓度的增加而降低。此外，还可以通过同时调节载流子浓度和迁移率来获得最优功率因数。在773K下，Pb0.96Bi0.04S的最佳热电优值系数(ZT)可达0.89，且随温度的升高而升高，没有饱和迹象。我们的工作可能会为PbS基热电材料的进一步环保应用提供参考。
Lead sulfide (PbS) is a type of promising thermoelectric materials which is consist of elements with high natural abundance. However, the relatively low conversion efficiency limits its further application due to the high lattice thermal conductivity of PbS compared with that of PbTe. It has been widely accepted that nanostructuring and doping are effective ways to enhance the thermoelectric properties. Herein, nano/micro structure Bi doped PbS materials have beensynthesized by a facile method of hydrothermal synthesis. The nano/micro structure material systems exist abundant interface which could scatter mid- and low-frequency phonons effectively, combined with point defect such as Bi–Pbscattering high-frequency phonons, and thus the results show that the lattice thermal conductivity of PbS decreases with the increasing concentration of Bi3+doping as expected. Moreover, the optimal power factor (PF) can be obtained by tuning the carrier concentration and mobility at the same time. The optimal thermoelectric figure of merit (ZT) can reach 0.89 for Pb0.96Bi0.04S at 773K and rises with the increase of the temperature without sign of saturation. Our work may shed light to further possible and environmentally friendly application of PbS-based thermoelectric materials.