无机材料学报2024，Vol.39Issue(3)：306-312,7.DOI:10.15541/jim20230316
能带优化和载流子调控改善SnTe的热电性能
Improvement of Thermoelectric Performance of SnTe by Energy Band Optimization and Carrier Regulation
摘要
Abstract
As group ⅣA tellurides,SnTe has the same crystal structure and similar bivalent band structure as PbTe,making it a promising thermoelectric material.However,the main concern of softening at elevated temperature and lower ZT at low temperatures has been hindering its application.Therefore,it is significant to expand the service temperature range of SnTe by improving its average ZT.It has been reported that the thermoelectric performance of SnTe is improved by regulating the power factor and lattice thermal conductivity based on band and lattice engineering.In this study,MgSe alloying strategy was used to prepare a series of Sn1-yPbyTe-x%MgSe(0.01≤y≤0.05,0≤x≤6)samples by combining melting and Spark Plasma Sintering(SPS)techniques.The results show that alloying MgSe leads to an increase in the band gap,effectively suppressing the bipolar effect of intrinsic SnTe,improving the Seebeck coefficient in the high-temperature range,and reducing lattice thermal conductivity through phonon scattering as well.As a result,ZT at 873 K is improved by 100%.The incorporation of Pb effectively modulates the carrier concentration,successfully suppressing electronic thermal conductivity,and thereby improving average thermoelectric performance of SnTe.Among them,Sn0.96Pb0.04Te-4%MgSe possesses a ZT value of 1.5 at 873 K and an average ZT value of 0.8 at 423-873 K,displaying superior performance compared to literature.关键词
热电材料/载流子调制/合金化/能带工程/SnTeKey words
thermoelectric material/carrier modulation/alloying/band engineering/SnTe分类
通用工业技术引用本文复制引用
陈浩,樊文浩,安德成,陈少平..能带优化和载流子调控改善SnTe的热电性能[J].无机材料学报,2024,39(3):306-312,7.基金项目
国家自然科学基金(52202277) （52202277）
山西省自然科学基金(202203021221071) （202203021221071）
山西省科技合作与交流专项项目(202104041101007) （202104041101007）
山西省回国留学人员科研资助项目(2023-083)National Natural Science Foundation of China(52202277) （2023-083）
Natural Science Foundation of Shanxi Province(202203021221071) （202203021221071）
Special Project of Scientific and Technological Cooperation and Exchange in Shanxi Province(202104041101007) （202104041101007）
Shanxi Scholarship Council of China(2023-083) （2023-083）
