Realizing high thermoelectric performance in GeTe through decreasing the phase transition temperature via entropy engineering

doi:10.1039/c9ta10963c

	Realizing high thermoelectric performance in GeTe through decreasing the phase transition temperature via entropy engineering
	Qiu, Yuting; Jin, Yang; Wang, Dongyang; Guan, Mengjia; He, Wenke; Peng, Shang; Liu, Ruiheng; Gao, Xiang; Zhao, Li-Dong
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2019-12-14
卷号	7 期号:46 页码:26393
ISSN号	2050-7488
DOI	10.1039/c9ta10963c
文献子类	Article
英文摘要	Entropy engineering is one of the powerful approaches to suppress phase transitions. GeTe has a very high thermoelectric performance at relatively high temperatures, but the low structure symmetry and phase transition in the low temperature range limits its performance stability for power generation applications. Therefore, the optimized electrical transport properties of GeTe in a low temperature range are expected for improving the structural symmetry via suppressing phase transition. Herein, the phase transition temperature for GeTe was successfully decreased by introducing high entropy via continuously multiple doping; the phase transition temperature is correspondingly reduced from 660 K to 523 K. The Seebeck coefficient was enhanced by the improved structural symmetry through enhancing band effective mass while the carrier concentration is maintained in an optimum range. A record-high power factor of similar to 23 mu W cm(-1) K-2 was obtained at 300 K in the highest entropy sample. We found that the increased configurational entropy obtained by continuous, multiple doping produces short-range disordered microstructures, which lead to an ultralow lattice thermal conductivity of similar to 0.4 W m(-1) K-1. Combining the record high power factor and low thermal conductivity, a maximum ZT value of similar to 2.1 at 800 K was achieved for the highest entropy species Ge0.84In0.01Pb0.1Sb0.05Te0.997I0.003. This study provides an effective path to enhance thermoelectric performances via introducing entropy engineering.
WOS关键词	THERMAL TRANSPORT-PROPERTIES ; POLYCRYSTALLINE SNSE ; HIGH FIGURE ; MERIT ; CONDUCTIVITY ; CONVERGENCE ; SUPPRESSION ; BI ; ZT
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	ROYAL SOC CHEMISTRY
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/27449]
专题	中国科学院上海硅酸盐研究所
推荐引用方式 GB/T 7714	Qiu, Yuting,Jin, Yang,Wang, Dongyang,et al. Realizing high thermoelectric performance in GeTe through decreasing the phase transition temperature via entropy engineering[J]. JOURNAL OF MATERIALS CHEMISTRY A,2019,7(46):26393.
APA	Qiu, Yuting.,Jin, Yang.,Wang, Dongyang.,Guan, Mengjia.,He, Wenke.,...&Zhao, Li-Dong.(2019).Realizing high thermoelectric performance in GeTe through decreasing the phase transition temperature via entropy engineering.JOURNAL OF MATERIALS CHEMISTRY A,7(46),26393.
MLA	Qiu, Yuting,et al."Realizing high thermoelectric performance in GeTe through decreasing the phase transition temperature via entropy engineering".JOURNAL OF MATERIALS CHEMISTRY A 7.46(2019):26393.