Boosting thermoelectrics by alloying Cu_(2)Se in SnTe-CdTe compounds

作     者：Zhiyu Chen Juan Li Jing Tang Fujie Zhang Yan Zhong Hangtian Liu Ran Ang Zhiyu Chen;Juan Li;Jing Tang;Fujie Zhang;Yan Zhong;Hangtian Liu;Ran Ang

作者机构：Key Laboratory of Radiation Physics and TechnologyMinistry of EducationInstitute of Nuclear Science and TechnologySichuan UniversityChengdu610064China Interdisciplinary Materials Research CenterSchool of Materials Science and EngineeringTongji UniversityShanghai201804China Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065Chin 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第89卷第30期

页      面：45-51页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Key Research and Development Program of China(Grant No.2018YFA0702100) the Joint Funds of the National Natural Science Foundation(NNSF)of China the Chinese Academy of Sciences’Large-Scale Scientific Facility(Grant No.U1932106) the NNSF of China(Grant No.51771126) the Nuclear Power Technology Innovation Center(NPTIC)of China(Grant No.HG2020065) Sichuan University Innovation Research Program of China(Grant No.2020SCUNL112) the World First-Class University Construction Funding of China 

主　　题：SnTe Thermoelectrics Quality factor Fermi level 

摘      要：The discovery of band convergence has opened an effective avenue for significantly enhancing thermoelectric performance of SnTe,while alloying CdTe in SnTe is evidenced efficient for improving the valley ***,the thermoelectric transport properties are limited due to the low solubility of CdTe in SnTe(~3%).Inspired by the improvement of dimensionless figure of merit zT in Cu or Se-doped SnTe,investigating the effect of Cu_(2)Se on the electronic and phonon transport properties of SnTe-CdTe alloys is highly ***,improving the quality factor can trigger an increase of the potential of a compound for higher zT,which is of importance for design of thermoelectric ***,alloyed 3%Cu_(2)Se in SnTe-3%CdTe system enables an increased peak zT,which is attributed by the optimization of electronic performance(~21μW cm^(-1)K^(-2)at 800 K),as well as the decreased lattice thermal conductivity owing to the enhanced mass and strain *** importantly,alloying Cu_(2)Se not only improves the quality factor from~0.25 to~0.45,resulting in a higher maximum potential zT,but also effectively preserves the Fermi energy in a relative optimized *** current findings demonstrate the role of Cu_(2)Se for manipulating thermoelectrics in SnTe.