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High Thermoelectric Performance of Co-Doped P-Type Polycrystalline SnSe via Optimizing Electrical Transport Properties
Li, Chengjun4; Wu, Hong2,3,4; Zhang, Bin1; Zhu, Huaxing4; Fan, Yijing4; Lu, Xu4; Sun, Xiaonan5; Zhang, Xiao1; Wang, Guoyu2,3; Zhou, Xiaoyuan1,4
2020-02-19
摘要This work systematically investigated the thermoelectric properties of p-type Na and M (M = K, Li, Ag) codoped polycrystalline SnSe. It is found that the electrical properties of polycrystalline SnSe can be improved significantly for (Na, Ag) codoped samples, contributed by the enhanced carrier concentration. Specifically, a carrier concentration of 6.23 x 10(19) cm(-3) was obtained in Sn0.98Na0.016Ag0.004Se sample at 335 K, an increase of 18% compared with that of the Na single-doped sample (5.22 x 10(19) cm(-3)). The power factor reached similar to 0.73 mW m(-1) K-2 for the Sn0.98Na0.016Ag0.004Se sample at 785 K, enhanced by similar to 26% compared with Na single-doped one. In addition, Sn-rich and Ag-rich particles/areas observed in the matrix of Sn0.98Na0.016Ag0.004Se contribute to the reduction of lattice thermal conductivity from 0.61 W m(-1) K-1 for Sn0.98Ag0.02Se to 0.47 W m(-1) K-1 at 785 K. The combination of simultaneously enhanced power factor and depressed thermal conductivity leads to a maximum ZT approximate to 1.2 at 785 K and a high average ZT approximate to 0.74 at 335-785 K for Sn0.98Na0.016Ag0.004Se, and generating a high theoretical conversion efficiency of similar to 11%. These illuminating discoveries could provide routes to enhance the thermoelectric performance in p-type polycrystalline SnSe.
关键词SnSe codoping thermoelectric performance Sn/Ag-rich particles conversion afficiency
DOI10.1021/acsami.9b20610
发表期刊ACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
卷号12期号:7页码:8446-8455
通讯作者Zhang, Xiao(seashellemma@163.com) ; Wang, Guoyu(guoyuw@cigit.ac.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000515214300064
语种英语