Solution-processed n-type Bi_2Te_(3-x)Se_x nanocomposites with enhanced thermoelectric performance via liquid-phase sintering

作     者：Chaohua Zhang Chunxiao Zhang Hongkuan Ng Qihua Xiong 张朝华;张春笑;黄洪宽;熊启华

作者机构：College of Materials Science and EngineeringShenzhen Key Laboratory of Special Functional MaterialsShenzhen UniversityShenzhen 518060China Division of Physics and Applied PhysicsSchool of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2019年第62卷第3期

页      面：389-398页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the Natural Science Foundation of SZU (2017003) Shenzhen Science and Technology Research Grant (JCYJ20150324141711684) Singapore National Research Foundation (NRF-RF2009-06) an Investigator-ship Award (NRFNRFI2015-03) Ministry of Education (Singapore) via an AcRF Tier2 Grant (MOE2012-T2-2-086) 

主　　题：thermoelectric liquid-phase sintering nanocomposites solution-processed bismuth telluride 

摘      要：The much slower progress in enhancing the thermoelectric performance of n-type Bi2Te3 than that of p-type Bi2Te3 based materials in the past decade hinders the widespread use in power generation and refrigeration. Here, a facile bottom-up solution-synthesis with spark plasma sintering(SPS) process has been developed to build n-type Bi2Te3-xSex bulk nanocomposites, which substantially improves the power factor and decreases the lattice thermal conductivity by tuning the interface scattering of phonons and electrons. The stoichiometric composition in ternary Bi2Te3-xSex nanocomposites is also tuned to optimize the carrier concentration and lattice thermal conductivity. The optimized bulk nanocomposite Bi2Te2.7Se0.3 exhibits a ZT of 1.1 at^371 K, which is comparable to the corresponding commercially available ingots. Our results demonstrate the great potential of the solution-processed n-type Bi2Te3-xSex nanocomposites for cost-effective thermoelectric applications.