气候变化领域集成服务门户(CCPortal): Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity

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DOI	10.1039/c8ee01151f
	Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity
	Xiao Y.; Wu H.; Cui J.; Wang D.; Fu L.; Zhang Y.; Chen Y.; He J.; Pennycook S.J.; Zhao L.-D.
发表日期	2018
ISSN	17545692
起始页码	2486
结束页码	2495
卷号	11 期号:9
英文摘要	Thermoelectric materials enable direct inter-conversion between electrical energy and thermal energy. The conversion efficiency is limited by their complex interdependent thermoelectric parameters. Here, we report that the electrical and thermal transport properties of n-type PbTe can be simultaneously improved by introducing just one component, MnTe. We obtained a maximum ZT of ∼1.6 at 773 K and an average ZTave of >1.0 at 300-873 K in n-type MnTe alloyed PbTe. This remarkably enhanced performance arises from the triple functions of MnTe alloying: (1) making the conduction band flatter to increase the effective mass from 0.31 me to 0.45 me; (2) enlarging the band gap of PbTe to suppress the bipolar thermal conductivity; and (3) introducing point defects instead of nanoprecipitates to reduce the lattice thermal conductivity while maintaining a relatively high carrier mobility. Our results indicate that high performance can be achieved in n-type PbTe by integrating different but synergistic concepts. © 2018 The Royal Society of Chemistry.
英文关键词	Carrier mobility; Energy gap; IV-VI semiconductors; Lead alloys; Manganese alloys; Point defects; Precipitation (chemical); Thermoelectricity; Effective mass; Electrical energy; High carrier mobility; Lattice thermal conductivity; Nanoprecipitates; Thermal transport properties; Thermo-Electric materials; Thermoelectric parameters; Thermal conductivity; alloy; lead; optimization; performance assessment; synergism; tellurium; thermal conductivity
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190131
作者单位	School of Materials Science and Engineering, Beihang University, Beijing, 100191, China; Department of Materials Science and Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore, 117575, Singapore; Department of Physics, Southern University of Science and Technology, Shenzhen, 518055, China; Department of Mechanical Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Xiao Y.,Wu H.,Cui J.,et al. Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity[J],2018,11(9).
APA	Xiao Y..,Wu H..,Cui J..,Wang D..,Fu L..,...&Zhao L.-D..(2018).Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity.Energy & Environmental Science,11(9).
MLA	Xiao Y.,et al."Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity".Energy & Environmental Science 11.9(2018).