Modulation doping of p-type Cu_(12)Sb_(4)S_(13)toward improving thermoelectric performance

作     者：Khak Ho Lim Mingquan Li Yu Zhang Yue Wu Qimin Zhou Qingyue Wang Xuan Yang Pingwei Liu Wen-Jun Wang Ka Wai Wong Ka Ming Ng Yu Liu Andreu Cabot Khak Ho Lim;Mingquan Li;Yu Zhang;Yue Wu;Qimin Zhou;Qingyue Wang;Xuan Yang;Pingwei Liu;Wen-Jun Wang;Ka Wai Wong;Ka Ming Ng;Yu Liu;Andreu Cabot

作者机构：Institute of Zhejiang University-QuzhouQuzhou 324000China College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310007China School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China Materials Research InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA Ostia Technologies LimitedUnited Kingdom Department of Chemical and Biological EngineeringThe Hong Kong University of Science and TechnologyClear Water BayHong KongChina ICREAPg.Lluis Companys 23Barcelona 08010Spain Catalonia Energy Research Institute-IRECSant Adria del BesosBarcelona 08930Spain 

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

年 卷 期：2024年第171卷第4期

页      面：71-79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：Dr.K.H.Lim acknowledges the financial support of the National Natural Science Foundation of China(Grant No.22208293) Research Funds of the Institute of Zhejiang University-Quzhou(Nos.IZQ2021RCZX003,IZQ2021RCZX002,IZQ2021KJ2024,IZQ2022KYZX09) supported by the State Key Laboratory of Fluorinated Greenhouse gases Replacement and Treatment(No.SKLFGGRT2022001) the State Key Laboratory of Electrical Insulation and Power Equipment(No.EIPE23201) Dr.Y.Liu acknowledges funding from the National Natural Science Foundation of China(NSFC)(Grants No.22209034) the Innovation and Entrepreneurship Project of Overseas Returnees in Anhui Province(Grants No.2022LCX002) 

主　　题：Modulation doping Thermoelectric Interphase transport Charge flooding Phonon-carrier scattering 

摘      要：The commercial viability of thermoelectric(TE)devices relies heavily on two factors:cost reduction and efficiency *** this study,we first produce p-type Cu_(12)Sb_(4)S_(16-x)(x=0,3,4)using a low-temperature bottom-up approach and demonstrate Cu_(12)Sb_(4)S_(13)to show the best TE performance among the three tested ***,the TE energy conversion efficiency of Cu_(12)Sb_(4)S_(13)is further enhanced by optimizing its electronic band structure through the incorporation of small amounts of *** an optimal Te content of 5 mol%,more than a twofold increase in the TE figure of merit(zT)is *** gain insight into the mechanism of improvement on the transport properties of the mate-rial,we compare the interphase transport mechanism by incorporating nanodomains of different metals(Ag and Cu)into the Cu_(12)Sb_(4)S_(13)*** improved electrical conductivity obtained with Cu_(12)Sb_(4)S_(13)-Te nanocomposites is attributed to a charge flooding of the Cu_(12)Sb_(4)S_(13)*** contrast,excessive down-ward band-bending at the interphases of Ag/Cu metal-semiconductor drastically reduces the electrical ***,a weighted mobility(μw)analysis shows a dominant thermal activation of carri-ers in Cu_(12)Sb_(4)S_(13)-Te *** this material,a strong decrease in lattice thermal conductivity is also found,which is associated with a phonon-carrier scattering *** work shows the impor-tance of proper band-engineering in TE nanocomposites to decouple electrical and thermal transport to enhance TE performance,and the efficacy ofμw for electrical and thermal transport analysis.