Enhancing thermoelectric performance of p-type SnTe through manipulating energy band structures and decreasing electronic thermal conductivity

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外文摘要：SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of PbTe.However,excessive hole carrier concentration in SnTe results in an extremely low Seebeck coefficient and high thermal conductivity,which makes it exhibit relatively inferior thermoelectric proper-ties.In this work,the thermoelectric performance of p-type SnTe is enhanced through regulating its energy band structures and reducing its electronic thermal conductivity by combining Bi doping with CdSe alloying.First,the carrier concentration of SnTe is successfully suppressed via Bi doping,which significantly decreases the electronic thermal conductivity.Then,the convergence and flattening of the valence bands by alloying CdSe effectively improves the effective mass of SnTe while restraining its carrier mobility.Finally,a maximum figure of merit(ZT)of～0.87 at 823 K and an average ZT of～0.51 at 300-823 K have been achieved in Sn0.96Bi0.04Te-5％CdSe.Our results indicate that decreasing the electronic thermal conductivity is an effective means of improving the per-formance of thermoelectric materials with a high carrier concentration.

外文关键词：

Thermoelectric materialsSnTeEnergy band structureElectronic thermal conductivityZT value

作者：

Xin Qian、Hao-Ran Guo、Jia-Xin Lyu、Bang-Fu Ding、Xing-Yuan San、Xiao Zhang、Jiang-Long Wang、Shu-Fang Wang

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作者单位：

Hebei Key Lab of Optic-Electronic Information and Materials,College of Physics Science and Technology,Hebei University,Baoding 071002,China

College of Electron and Information Engineering,Hebei University,Baoding 071002,China

Research Institute for Frontier Science,Beihang University,Beijing 100191,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaHighlevel Talents Research Initiation Project of Hebei UniversityHebei Province Introduced Overseas Student Funding Projectenergy band structure calculations were performed on the Super Cloud Computing Center of Beijing and NingxiaHigh-Performance Computing Center of Hebei University,and TianHe-1(A)at the National Supercomputer Center in Tianjin

项目编号：

5210223451972094521000981421C20210313

出版年：

2024

DOI：

10.1007/s12598-024-02663-3

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

年,卷(期)：2024.43(7)