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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 PublicationADVANCED SCIENCE
Issue12
SubtypeArticle
AbstractIn-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.
DOI10.1002/advs.201902628
WOS KeywordRAMAN-SCATTERING ; THERMAL-CONDUCTIVITY ; HIGH FIGURE ; THIN-FILMS ; PERFORMANCE ; CDTE ; NANOSTRUCTURES ; REDUCTION ; PHONONS ; PHASE
Language英语
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
PublisherWILEY
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://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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