单晶SnSe热电材料研究进展

A Review on the Single Crystals SnSe Thermoelectrics

热电材料是一种环境友好型的新能源转换材料。随着社会的发展,越来越多的热电材料被开发利用。单晶SnSe热电材料因其优异的热电性能成为热电研究领域的“明星材料”。截至目前,p型SnSe单晶材料在b方向上获得了2.6@923 K的高热电优值,n型SnSe单晶材料在层间方向的ZT值高达2.8@773 K。本文以单晶SnSe热电材料的研究进展为主线,阐明了SnSe单晶优异热电性能的根源,概述了单晶SnSe的生长方法,总结了优化单晶SnSe热电性能的途径(包括电学方面的能带工程和载流子浓度优化以及热学方面的点缺陷调控等),最后简要回顾了近几年单晶SnSe的发展状况。

Thermoelectrics are advanced energy conversion materials.During the past decades,more and more thermoelectrics have been exploited and single crystals SnSe has become one"star material"in thermoelectric community due to its superior thermoelectric properties.Up to now,high figure-of-merit of 2.6 at 923 K along b axis for p-type SnSe single crystals and 2.8 at 773 K for n-type SnSe single crystals along out of plane were obtained.In this paper,based on the thorough investigation of single crystal SnSe,we clarify the origin of the excellent properties of SnSe,and summarize the synthetic methods and strategies to optimize the thermoelectric properties of single crystal SnSe,including band engineering,carrier concentration optimization and point defects engineering to reduce the thermal conductivity.Finally,we highlight the development of single crystals SnSe in recent years and shed some light on further improvement of this system for future study.