Mid-temperature thermoelectric performance of zone-melted Sb_(2)(Te,Se)_(3) alloys near phase transition boundary

作     者：Beibei Li Renshuang Zhai Teng Fang Kaiyang Xia Yongjun Wu Tiejun Zhu 

作者机构：State Key Laboratory of Silicon MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou310027China 

出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)

年 卷 期：2019年第5卷第4期

页      面：590-596页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 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 Science Foundation of China(No.51871199,51861145305,51572237,61534001) the Zhejiang Provincial Natural Science Foundation(No.LZ17E020003) the Fundamental Research Funds for the Central Universities(No.2017XZZX001-04,2017QNA4011) the 111 Project(No.B16042) 

主　　题：Thermoelectric materials Zone melting Structural transition Doping Thermoelectric properties 

摘      要：(Bi,Sb)_(2)(Te,Se)_(3) alloys are widely used commercial thermoelectric(TE)materials for solid-state refrigeration around room *** composition-induced structural phase transition could be realized by varying the compositions in these alloys,which may largely alter the electronic structure and phonon *** them,the Se-alloyed Sb_(2)Te_(3) accompanied with structural transition is seldom ***,the interrelations of Se-alloying induced changes in structural phase transition,band structure and TE properties of p-type zone-melted Sb_(2)Te_(3-x)Se_(x)(x=1.5-2.4)alloys near phase transition boundary are systematically *** results demonstrate that Sb_(2)Te_(3-x)Se_(x) shows a structural transition from a rhombohedral phase to mixed structure at x=*** carrier concentration and bandgap at room temperature of Sb_(2)Te_(3)-xSex(x=1.5-2.4)constantly decrease with increasing Se contents *** zT peak of the Sb_(2)TeSe_(2) matrix is improved and shifted to higher temperature by optimizing carrier concentration via Ag doping.A maximum zT of~0.4 is obtained at 680 K in Sb_(1.97)Ag_(0.03)TeSe_(2) alloy,about 100% enhancement compared with the undoped sample.