Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds

doi:10.1007/s12598-020-01476-4

SIC OpenIR

	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 Publication	RARE METALS
ISSN	1001-0521
Issue	10 Pages:1127
Subtype	Article
Abstract	The 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.
DOI	10.1007/s12598-020-01476-4
WOS Keyword	THERMAL-CONDUCTIVITY ; IMPURITY SCATTERING ; PERFORMANCE
Language	英语
WOS Research Area	Materials Science ; Metallurgy & Metallurgical Engineering
Publisher	NONFERROUS METALS SOC CHINA
Citation statistics
Document Type	期刊论文
Identifier	http://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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