Highly Textured N-Type SnSe Polycrystals with Enhanced Thermoelectric Performance

作     者：Peng-Peng Shang Jinfeng Dong Jun Pei Fu-Hua Sun Yu Pan Huaichao Tang Bo-Ping Zhang Li-Dong Zhao Jing-Feng Li Peng-Peng Shang;Jinfeng Dong;Jun Pei;Fu-Hua Sun;Yu Pan;Huaichao Tang;Bo-Ping Zhang;Li-Dong Zhao;Jing-Feng Li

作者机构：State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua UniversityBeijing 100084 China College of Chemistry and Material Science Shandong Agricultural University Tai'an 271018 China The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Beihang University Beijing 100191 China 

出 版 物：《研究（英文）》 (Research)

年 卷 期：2020年第2期

页      面：267-276页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

基　　金：This work was supported by the Basic Science Center Project of NSFC under Grant No.51788104 and the National Key R&D Program of China (Grant No.2018YFB0703603) 

摘      要：Thermoelectric materials,which directly convert heat into electricity based on the Seebeck effects,have long been investigated for use in semiconductor refrigeration or waste heat *** them,SnSe has attracted significant attention due to its promising performance in both p-type and n-type crystals;in particular,a higher out-of-plane ZT value could be achieved in n-type SnSe due to its 3D charge and 2D phonon *** this work,the thermoelectric transport properties of n-type polycrystalline SnSe were investigated with an emphasis on the out-of-plane transport through producing textural *** textures were fabricated using mechanical alloying and repeated spark plasma sintering (SPS),as a kind of hot pressing,aimed at producing strong anisotropic transports in n-type polycrystalline SnSe as that in crystalline *** show that the lowest thermal conductivity of 0.36Wm-1 K1 was obtained at 783K in perpendicular to texture ***,the electrical transport properties are less anisotropic and even nearly isotropic,and the power factors reach 681.3μWm-1 K-2 at 783 K along both parallel and perpendicular *** combination of large isotropic power factor and low anisotropic thermal conductivity leads to a maximum ZT of 1.5 at 783 *** high performance elucidates the outstanding electrical and thermal transport behaviors in n-type polycrystalline SnSe,and a higher thermoelectric performance can be expected with future optimizing texture in n-type polycrystalline SnSe.