Approaching the minimum lattice thermal conductivity of p-type SnTe thermoelectric materials by Sb and Mg alloying

查看全文 作　　者：Tiezheng [1]Fu;Jiazhan [1]Xin;Tiejun [1]Zhu;Jiajun [1]Shen;Teng [1]Fang;Xinbing [1]Zhao

机构地区：[1]State Key Laboratory of Silicon Materials,and School of Materials Science and Engineering,Zhejiang University

出　　处：《Science Bulletin》索引2019年第64卷第14期,共7页

基　　金：supported by the National Key Research and Development Program of China (2018YFB0703600);the National Science Fund for Distinguished Young Scholars (51725102);the National Natural Science Foundation of China (51861145305, 51761135127, and 51871199) 摘　　要：SnTe, as the nontoxic analogue to high-performance PbTe thermoelectric material, has captured the worldwide interest recently. Many triumphant instances focus on the strategies of band convergence, resonant doping, and nano-precipitates phonon scattering. Herein, the p-type SnTe-based materials Sn0.85-xSb0.15MgxTe (x=0-0.10) are fabricated and a combined effect of Sb and Mg is investigated. Sb alloying tunes the hole carrier concentration of SnTe and decreases the lattice thermal conductivity. Mg alloying leads to a nearly hundredfold rise of disorder parameter due to the large mass and strain fluctuations, and as a consequence the lattice thermal conductivity decreases further down to ~0.64Wm^-1K^-1 at 773K, close to the theoretical minimum of the lattice thermal conductivity (~0.50Wm^-1K^-1) of SnTe. In conjunction with the enhancement of the Seebeck coefficient caused by band convergence due to Mg alloying, the maximum zTmax reaches ~1.02 and the device zTdevice of ~0.50 at 773K for Sn0.79Sb0.15Mg0.06Te, suggesting this SnTe-based composition has a promising potential in intermediate temperature thermoelectric applications. 关键词：Tin TELLURIDE THERMOELECTRIC materials Point DEFECT scattering Band convergence

相关文献

参考文献（65）
引证文献（6）
耦合文献（84）

参考文献(65)

引证文献(6)

耦合文献(84)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Approaching the minimum lattice thermal conductivity of p-type SnTe thermoelectric materials by Sb and Mg alloying

参考文献(65)

引证文献(6)

耦合文献(84)

用户提示