Realizing high figure of merit in phase-separated polycrystalline Sn1-xPbxSe

摘要：

　　Solid-state thermoelectric technology,interconverting heat to electrical energy,offers a promising solution for relaxing global energy problems.A high dimensionless figure of merit ZT is desirable for high-efficiency thermoelectric power generation.Thus far,thermoelectric materials research has focused on increasing the material”s ZT.Here we firstly fabricated phase-separated Sn1-xPbxSe materials by hydrothermal synthesis.We demonstrate that the simultaneous optimization of power factor and significant reduction in thermal conductivity can be achieved in phase-separated Sn1-xPbxSe material.The introduction of PbSe phase contributes to improvement on the electrical conductivity and power factor of the SnSe phase.Meanwhile,nanoscale precipitates and mesoscale grains define all-scale hierarchical architectures to scattering phonons,leading to low lattice thermal conductivity.These two favorable factors lead to achieve remarkably high thermoelectric performance ZT~1.7 at 873 K in polycrystalline SnSe+1%PbSe along the pressing direction,which is a record high ZT for SnSe polycrystals.These findings highlight the prospects of realizing highly effective solid-state thermoelectric devices.

关键词： thermoelectric technology Sn1-xPbxSe all-scale hierarchical architectures high ZT

作者: Guodong Tang Wei Wei Jian Zhang Yusheng Li Xiang Wang Guizhou Xu Cheng Chang Zhihe Wang Youwei Du and Li-Dong Zhao

作者单位: School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210 Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hef School of Material Science and Engineering,Beihang University,Beijing 10091,China National Laboratory of Solid State Microstructures,Department of Physics,Nanjing University,Nanjing

会议类型: 国内会议

会议名称: 2016新能源新材料研究生论坛

会议地点: 上海

会议语种:英文

页码: 1-14

在线出版日期: 2016-11-04（万方平台首次上网日期，不代表论文的发表时间）