3D charge and 2D phonon transports leading to high out-of-plane ZT in n-type SnSe crystals

doi:10.1126/science.aaq1479

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	3D charge and 2D phonon transports leading to high out-of-plane ZT in n-type SnSe crystals
	Chang, C ; Wu, MH ; He, DS ; Pei, YL ; Wu, CF ; Wu, XF ; Yu, HL ; Zhu, FY ; Wang, KD ; Chen, Y
刊名	SCIENCE
	2018
卷号	360 期号:6390 页码:778-782
关键词	High-thermoelectric Performance Thermal-conductivity Single-crystals Bulk Thermoelectrics Efficiency Enhancement Temperature Scattering Distortion Mechanism
ISSN号	0036-8075
DOI	10.1126/science.aaq1479
文献子类	期刊论文
英文摘要	Thermoelectric technology enables the harvest of waste heat and its direct conversion into electricity. The conversion efficiency is determined by the materials figure of merit ZT. Here we show a maximum ZT of similar to 2.8 +/- 0.5 at 773 kelvin in n-type tin selenide (SnSe) crystals out of plane. The thermal conductivity in layered SnSe crystals is the lowest in the out-of-plane direction [two-dimensional (2D) phonon transport]. We doped SnSe with bromine to make n-type SnSe crystals with the overlapping interlayer charge density (3D charge transport). A continuous phase transition increases the symmetry and diverges two converged conduction bands. These two factors improve carrier mobility, while preserving a large Seebeck coefficient. Our findings can be applied in 2D layered materials and provide a new strategy to enhance out-of-plane electrical transport properties without degrading thermal properties.
语种	英语
WOS记录号	WOS:000432473500046
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/28900]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chang, C 2.Wu, MH 3.He, DS 4.Pei, YL 5.Wu, CF 6.Wu, XF 7.Yu, HL 8.Zhu, FY 9.Wang, KD 10.Chen, Y
推荐引用方式 GB/T 7714	Chang, C,Wu, MH,He, DS,et al. 3D charge and 2D phonon transports leading to high out-of-plane ZT in n-type SnSe crystals[J]. SCIENCE,2018,360(6390):778-782.
APA	Chang, C.,Wu, MH.,He, DS.,Pei, YL.,Wu, CF.,...&Zhao, LD.(2018).3D charge and 2D phonon transports leading to high out-of-plane ZT in n-type SnSe crystals.SCIENCE,360(6390),778-782.
MLA	Chang, C,et al."3D charge and 2D phonon transports leading to high out-of-plane ZT in n-type SnSe crystals".SCIENCE 360.6390(2018):778-782.