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Attaining enhanced thermoelectric performance in p-type (SnSe) 1-x (SnS 2 ) x produced via sintering their solution-synthesized micro/nanostructures
Liu, Xiaofang1,2; Wang, Hengyang1,2; Zhang, Bin3; Zheng, Sikang4; Chen, Yao1,2; Zhang, Hong1,2; Chen, Xianhua1,2; Wang, Guoyu5; Zhou, Xiaoyuan2,3,4; Han, Guang1,2
2022-09-01
摘要SnSe, possessing strong lattice anharmonicity and structural anisotropy, has attracted massive attention in thermoelectric conversion. Herein, we demonstrate that simultaneously optimized electrical and thermal transport properties are achieved in SnS 2 -alloyed SnSe polycrystalline materials, which were fabricated via sintering the mixture of solution-synthesized SnSe microplates and SnS 2 nanoplates. Resulting from the increased carrier concentration, p-type (SnSe) 1-x (SnS 2 ) x ( x = 0.5%, 1%) samples obtain muchimproved power factor between 300 K and 373 K, e.g. 0.72 mW m -1 K -2 at 300 K for (SnSe) 0.99 (SnS 2 ) 0.01 , which is enhanced by 53% compared to that of SnSe. Additionally, the existing point defects and planar defects effectively strengthen phonon scattering, thus reducing the lattice thermal conductivity, for example, 0.47 W m -1 K -1 at 773 K for the x = 0.02 sample. Eventually, a maximum zT of 0.80 at 823 K and an average zT of 0.52 over 300 - 823 K are obtained in the (SnSe) 0.99 (SnS 2 ) 0.01 sample, which are increased by 33% and 45% compared to those of SnSe, respectively. This study demonstrates a secondary phase alloying strategy to synergistically optimize the electrical and thermal properties of polycrystalline SnSe.
关键词Thermoelectric SnSe Solvothermal synthesis Lattice thermal conductivity
DOI10.1016/j.jmst.2021.11.072
发表期刊JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
卷号120页码:205-213
通讯作者Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn) ; Han, Guang(guang.han@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000788117700004
语种英语