SEMINAR
The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences

　　中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室
　　Thermoelectric performance of quaternary (PbTe)_(1-x-y)(PbSe)_x(PbS)_y compounds

　　Speaker

　　Dr. Sima Aminorroaya

　　Australian Institute for Innovative Materials, University of Wollongong, Australia

　　时间：11月26日 （星期三）下午3：00

　　地点：2号楼607会议室

　　联系人：陈立东 （4804）

　　报告摘要：

　　Lead chalcogenides (PbQ, Q = Te, Se, S) have proved to possesshigh thermoelectric efficiency for both n-type and p-type compounds. Recently a significant improvement in thermoelectric performance of p-type ternary PbTe-PbSe and PbTe-PbS systems has been realized through alternating the electronic band structure and introducing nano-scale precipitates to bulk materials respectively. However, the quaternary system of PbTe-PbSe-PbS has received less attention. We have studied the thermoelectric efficiency of single phase and nanostructured p-type quaternary PbTe-PbSe-PbS and shown that singlephase quaternary chalcogenides is superior to ternary PbTe-PbSe and PbTe-PbS at similar carrier concentrations and the binary PbTe, PbSe and PbS alloys. The thermoelectric efficiency of nanostructured p-type quaternary lead chalcogenides was found to be lower than that of single phase alloys. The n-type nanostructured quaternary compound of (PbTe)_0.75(PbS)_0.15(PbSe)_0.1 revealed that the reduction in the lattice thermal conductivity owing to phonon scattering at the defects and interfaces was compensated by reduced carrier mobility. This results in a maximum figure of merit similar to the performance of the single phase alloys of PbTe, PbSe, and (PbTe)_(1-x)(PbSe)_x.

　　报告人简介：

　　Dr. Sima Aminorroaya received her PhD in 2009 from Faculty of Engineering, University of Wollongong in Materials Science and Engineering. She worked as associate research fellow in Pyrosearch group at the University of Queensland for a year and then appointed as research fellow at the Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong. She also spent 6 months research fellowship in the California Institute of Technology (Caltech) in 2012 and holds Australian Research Council (ARC) fellowship since 2013 at the Australian Institute for Innovative Materials (AIIM), University of Wollongong. Her current research interests are thermoelectric materials and functional materials for energy storage and electronics devices.