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DOI	10.1039/d0ee02323j
	Ultralow thermal conductivity in diamondoid lattices: High thermoelectric performance in chalcopyrite Cu0.8+: YAg0.2In1- yTe2
	Xie H.; Hao S.; Cai S.; Bailey T.P.; Uher C.; Wolverton C.; Dravid V.P.; Kanatzidis M.G.
发表日期	2020
ISSN	1754-5692
起始页码	3693
结束页码	3705
卷号	13 期号:10
英文摘要	Because of its unique transport properties, CuInTe2 has been considered as a promising p-type material for thermoelectric applications. However, its diamondoid structure gives it a high intrinsic lattice thermal conductivity that greatly limits its thermoelectric performance. In this study, we demonstrate that Ag alloying gives rise to an extremely low lattice thermal conductivity of 0.47 W m-1 K-1 for Cu0.8Ag0.2InTe2 at 850 K. Moreover, we found Cu doping significantly improves the carrier mobility while simultaneously increasing the carrier concentration. As a result, the power factor of Cu0.8Ag0.2InTe2 increases and a maximum ZT of ~1.6 is achieved at 850 K. Both DFT calculations and low temperature heat capacity measurements suggest a strong interaction between low frequency optical phonons and heat carrying acoustic phonons, which is derived from the weak Ag-Te bonding. This strong phonon coupling decreases the Debye temperature and induces a low sound velocity. © The Royal Society of Chemistry.
语种	英语
scopus关键词	Carrier concentration; Copper compounds; Crystal lattices; Hall mobility; Hole mobility; Phonons; Silver alloys; Specific heat; Temperature; Thermoelectricity; Acoustic phonons; Lattice thermal conductivity; Low temperature heat capacities; Optical phonons; Phonon coupling; Strong interaction; Thermoelectric application; Thermoelectric performance; Thermal conductivity
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162856
作者单位	Department of Chemistry, Northwestern University, Evanston, IL 60208, United States; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States; Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Xie H.,Hao S.,Cai S.,et al. Ultralow thermal conductivity in diamondoid lattices: High thermoelectric performance in chalcopyrite Cu0.8+: YAg0.2In1- yTe2[J],2020,13(10).
APA	Xie H..,Hao S..,Cai S..,Bailey T.P..,Uher C..,...&Kanatzidis M.G..(2020).Ultralow thermal conductivity in diamondoid lattices: High thermoelectric performance in chalcopyrite Cu0.8+: YAg0.2In1- yTe2.Energy and Environmental Science,13(10).
MLA	Xie H.,et al."Ultralow thermal conductivity in diamondoid lattices: High thermoelectric performance in chalcopyrite Cu0.8+: YAg0.2In1- yTe2".Energy and Environmental Science 13.10(2020).