The Electronic Transport Channel Protection and Tuning in Real Space to Boost the Thermoelectric Performance of Mg_(3+δ)Sb_(2-y)Bi_(y) near Room Temperature

查看全文 作　　者：Zhijia [1,2]Han;Zhigang [3,4]Gui;[1]Y.BZhu;Peng [1]Qin;Bo-Ping [2]Zhang;Wenqing [3]Zhang;Li [3]Huang;Weishu [1,5]Liu

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;[2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 10083,China;[3]Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China;[4]Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China;[5]Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Research》索引2020年第1期,共12页

基　　金：The authors would like to thank the support of State’s Key Project of Research and Development Plan No.2018YFB0703600;NSFC Program No.51872133;Guangdong Innovative and Entrepreneurial Research Team Program No.2016ZT06G587;Shenzhen Basic Research Fund under Grant Nos.JCYJ20170817105132549 and JCYJ20180504165817769. 摘　　要：The optimization of thermoelectric materials involves the decoupling of the transport of electrons and phonons.In this work,an increased Mg_(1)-Mg_(2) distance,together with the carrier conduction network protection,has been shown as an effective strategy to increase the weighted mobility(U=μm∗3/2)and hence thermoelectric power factor of Mg_(3+δ)Sb_(2-y)Bi_(y) family near room temperature.Mg_(3+δ)Sb_(0.5)Bi_(1.5) has a high carrier mobility of 247 cm^(2)V^(-1) s^(-1) and a record power factor of 3470μWm^(-1) K^(-2) at room temperature.Considering both efficiency and power density,Mg_(3+δ)Sb_(1.0)Bi_(1.0) with a high average ZT of 1.13 and an average power factor of 3184μWm^(-1) K^(-2) in the temperature range of 50-250℃ would be a strong candidate to replace the conventional n-type thermoelectric material Bi_(2)Te_(2.7)Se_(0.3).The protection of the transport channel through Mg sublattice means alloying on Sb sublattice has little effect on electron while it significantly reduces phonon thermal conductivity,providing us an approach to decouple electron and phonon transport for better thermoelectric materials. 关键词：temperature ALLOYING transport

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The Electronic Transport Channel Protection and Tuning in Real Space to Boost the Thermoelectric Performance of Mg_(3+δ)Sb_(2-y)Bi_(y) near Room Temperature

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