Thermoelectric Enhancements in PbTe Alloys Due to Dislocation-Induced Strains and Converged Bands

doi:10.1002/advs.201902628

SIC OpenIR

	Thermoelectric Enhancements in PbTe Alloys Due to Dislocation-Induced Strains and Converged Bands
	Wu, YX; Nan, PF; Chen, ZW; Zeng, ZZ; Liu, RH; Dong, HL; Xie, L; Xiao, YW; Chen, ZQ; Gu, HK; Li, W; Chen, Y; Ge, BH; Pei, YZ
	2020-06-01
Source Publication	ADVANCED SCIENCE
Issue	12
Subtype	Article
Abstract	In-grain dislocation-induced lattice strain fluctuations are recently revealed as an effective avenue for minimizing the lattice thermal conductivity. This effect could be integratable with electronic enhancements such as by band convergence, for a great advancement in thermoelectric performance. This motivates the current work to focus on the thermoelectric enhancements of p-type PbTe alloys, where monotelluride-alloying and Na-doping are used for a simultaneous manipulation on both dislocation and band structures. As confirmed by synchrotron X-ray diffractions and Raman measurements, the resultant dense in-grain dislocations induce lattice strain fluctuations for broadening the phonon dispersion, leading to an exceptionally low lattice thermal conductivity of approximate to 0. 4 W m-K-1. Band structure calculations reveal the convergence of valence bands due to monotelluride-alloying. Eventually, the integration of both electronic and thermal improvements lead to a realization of an extraordinary figure of merit zT of approximate to 2.5 in Na0.03Eu0.03Cd0.03Pb0.91Te alloy at 850 K.
DOI	10.1002/advs.201902628
WOS Keyword	RAMAN-SCATTERING ; THERMAL-CONDUCTIVITY ; HIGH FIGURE ; THIN-FILMS ; PERFORMANCE ; CDTE ; NANOSTRUCTURES ; REDUCTION ; PHONONS ; PHASE
Language	英语
WOS Research Area	Chemistry ; Science & Technology - Other Topics ; Materials Science
Publisher	WILEY
Citation statistics	Cited Times:1[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/28063
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Wu, YX,Nan, PF,Chen, ZW,et al. Thermoelectric Enhancements in PbTe Alloys Due to Dislocation-Induced Strains and Converged Bands[J]. ADVANCED SCIENCE,2020(12).
APA	Wu, YX.,Nan, PF.,Chen, ZW.,Zeng, ZZ.,Liu, RH.,...&Pei, YZ.(2020).Thermoelectric Enhancements in PbTe Alloys Due to Dislocation-Induced Strains and Converged Bands.ADVANCED SCIENCE(12).
MLA	Wu, YX,et al."Thermoelectric Enhancements in PbTe Alloys Due to Dislocation-Induced Strains and Converged Bands".ADVANCED SCIENCE .12(2020).

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