Realizing High-Ranged Out-of-Plane ZTs in N-Type SnSe Crystals through Promoting Continuous Phase Transition

Chang, Cheng1; Wang, Dongyang1; He, Dongsheng2,3; He, Wenke1; Zhu, Fangyuan4; Wang, Guangtao5; He, Jiaqing2,3; Zhao, Li-Dong1

2019-07

10.1002/aenm.201901334

Advanced Energy Materials   影响因子和分区

1614-6832

1614-6840

Thermoelectric technology enables direct conversion between heat and electricity. The conversion efficiency of a thermoelectric device is determined by the average dimensionless figure of merit ZT(ave). Here, a record high ZT(ave) of approximate to 1.34 in the range of 300-723 K in n-type SnSe based crystals is reported. The remarkable thermoelectric performance derives from the high power factor and the reduced thermal conductivity in the whole temperature range. The high power factor is realized by promoting the continuous phase transition in SnSe crystals through alloying PbSe, which results in a higher symmetry of the crystal structure and the correspondingly modified electronic band structure. Moreover, PbSe alloying induces mass and strain fluctuations, which enables the suppression of thermal transport. These findings provide a new strategy to enhance the thermoelectric performance for the continuous phase transition materials.

continuous phase transition n-type SnSe crystals power factor thermal conductivity thermoelectrics

SCI ; EI

英语

通讯

Shanghai talent development funding[2017031]

Chemistry ; Energy & Fuels ; Materials Science ; Physics

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000477664700010

WILEY-V C H VERLAG GMBH

20192707124288

Alloying ; Chromium compounds ; Crystal symmetry ; Electric power factor ; IV-VI semiconductors ; Layered semiconductors ; Lead alloys ; Strain ; Thermal conductivity ; Thermoelectricity ; Tin compounds

Metallurgy:531.1 ; Lead and Alloys:546.1 ; Tin and Alloys:546.2 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Crystal Lattice:933.1.1 ; Materials Science:951

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
5.Henan Normal Univ, Coll Phys & Mat Sci, Xinxiang 453007, Henan, Peoples R China

Chang, Cheng,Wang, Dongyang,He, Dongsheng,et al. Realizing High-Ranged Out-of-Plane ZTs in N-Type SnSe Crystals through Promoting Continuous Phase Transition[J]. Advanced Energy Materials,2019,9(28).

Chang, Cheng.,Wang, Dongyang.,He, Dongsheng.,He, Wenke.,Zhu, Fangyuan.,...&Zhao, Li-Dong.(2019).Realizing High-Ranged Out-of-Plane ZTs in N-Type SnSe Crystals through Promoting Continuous Phase Transition.Advanced Energy Materials,9(28).

Chang, Cheng,et al."Realizing High-Ranged Out-of-Plane ZTs in N-Type SnSe Crystals through Promoting Continuous Phase Transition".Advanced Energy Materials 9.28(2019).