摘要
The layered 122 Zintl compounds have become an intriguing class of thermoelectric materials due to the promising electronic transport properties and inherently low thermal conductivity,showing the typical characteristics of"phonon-glass electron-crystal".Owing to the unprecedented performance tunability,the thermoelectric properties of the layered-structure compounds are completive with some traditional thermoelectric materials.Point defects involving vacancy,aliovalent doping and equivalent alloying atoms have been introduced to further enhance the thermoelectric properties.This review emphasizes the effects of various point defects on the thermoelectric parameters,and provides perspective on the strategies for increasing the thermoelectric figure of merit zT,which are believed to be applicable for improving the thermoelectric properties of many other compounds.
基金
Supported by the National Key Research and Development Program of China(2018YFA0702100)
the National Natural Science Foundation of China(21771123,51772186 and 51632005)
the Program of Introducing Talents of Discipline to Universities(D16002)。
