人工晶体学报2024，Vol.53Issue(3)：526-533,8.
Bi和Ag掺杂对SnTe热电性能的影响
Effect of Bi and Ag Doping on the Thermoelectric Property of SnTe
摘要
Abstract
SnTe has been widely studied as an alternative to PbTe because of its similar crystal structure and band structure to PbTe,the thermoelectric material with the best performance in the middle temperature region.Reducing the energy difference between heavy and valence bands and enlarging the band gap of SnTe are effective means to optimize the thermoelectric performance of SnTe.In this paper,by co-doping SnTe with Bi and Ag,the energy difference between heavy and valence bands is effectively reduced,the band gap is obviously increased,and the Sn1-2xBixAgxTe(x=0,0.01,0.02,0.03,0.04)samples with improved electric transport properties are obtained.Compared with undoped SnTe,the power factor of Sn1-2xBixAgxTe samples doped x=0.03 and 0.04 is significantly improved,and the maximum power factor of Sn0.94Bi0.03Ag0.03Te samples is 15.34 μW·cm-1·K-2,which is 12.9％higher than undoped SnTe.The maximum power factor of Sn0.92Bi0.04Ag0.04Te sample is 14.53 μW·cm-1·K-2.At the same time,Bi and Ag doping decreased the thermal conductivity of SnTe.In this study,the total thermal conductivity of Sn0.92Bi0.04Ag0.04Te samples is significantly lower than that of undoped SnTe,and the thermal conductivity of all samples gradually decreases with the increase of temperature.At 823 K,the total thermal conductivity of Sn0.92Bi0.04Ag0.04Te sample decreases to 3.073 W·m-1·K-1,and its ZT value increases to 0.387.It can be seen that the co-doping of Bi and Ag is an effective strategy to improve the thermoelectric performance of SnTe.关键词
热电材料/SnTe/热电性能/能带工程/第一性原理/掺杂Key words
thermoelectric material/SnTe/thermoelectric property/energy band engineering/first-principle/doping分类
数理科学引用本文复制引用
高磊,杨欣月,李文浩,王家宁,刘瑞秀,郑树启..Bi和Ag掺杂对SnTe热电性能的影响[J].人工晶体学报,2024,53(3):526-533,8.基金项目
中国石油大学(北京)校级自主科研基金(2462022YXZZ007) （北京）
