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Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds
Hu, P; Wei, TR; Huang, SJ; Xia, XG; Qiu, PF; Yang, J; Chen, LD; Shi, X
2020-10-01
Source PublicationRARE METALS
ISSN1001-0521
Issue10Pages:1127
SubtypeArticle
AbstractThe amalgamation of multi-subjects often elicits novel materials, new concepts and unexpected applications. Recently, Ge2Sb2Te5, as the most established phase-change material, has been found to exhibit decent thermoelectric performance in its stable, hexagonal phase. The challenge for higher figure of merit (zT) values lies in reducing the hole carrier concentration and enhancing the Seebeck coefficient, which, however, can be hardly realized by conventional doping. Here in this work, we report that the electrical properties of Ge(2)Sb(2)Te(5)can be readily optimized by anion-site modulation. Specifically, Se/S substitution for Te induces stronger and more ionic bonding, lowering the hole density. Furthermore, an increase in electronic density of state is introduced by Se substitution, contributing to a large increase in Seebeck coefficient. Combined with the reduced thermal conductivity, maximumzTvalues above 0.7 at 800 K have been achieved in Se/S-alloyed materials, which is similar to 30% higher than that in the pristine Ge2Sb2Te5.
DOI10.1007/s12598-020-01476-4
WOS KeywordTHERMAL-CONDUCTIVITY ; IMPURITY SCATTERING ; PERFORMANCE
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
PublisherNONFERROUS METALS SOC CHINA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27927
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Hu, P,Wei, TR,Huang, SJ,et al. Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds[J]. RARE METALS,2020(10):1127.
APA Hu, P.,Wei, TR.,Huang, SJ.,Xia, XG.,Qiu, PF.,...&Shi, X.(2020).Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds.RARE METALS(10),1127.
MLA Hu, P,et al."Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds".RARE METALS .10(2020):1127.
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