Multiple Converged Conduction Bands in K2Bi8Se13: A Promising Thermoelectric Material with Extremely Low Thermal Conductivity

Pei, Yanling1; Chang, Cheng1; Wang, Zhe2,4; Yin, Meijie2,4; Wu, Minghui2,4; Tan, Gangjian3; Wu, Haijun2,4,5; Chen, Yuexing2,4; Zheng, Lei1; Gong, Shengkai1; Zhu, Tiejun6,7; Zhao, Xinbing6,7; Huang, Li2,4; He, Jiaqing2,4; Kanatzidis, Mercouri G.3; Zhao, Li-Dong1

2016-12-21

10.1021/jacs.6b09568

Journal of the American Chemical Society   影响因子和分区

0002-7863

1520-5126

We report that K2Bi8Se13 exhibits multiple conduction bands that lie close in energy and can be activated through doping, leading to a highly enhanced Seebeck coefficient and a high power factor with elevated temperature. Meanwhile, the large unit cell, complex low symmetry crystal structure, and nondirectional bonding lead to the very low lattice thermal conductivity of K2Bi8Se13, ranging between 0.42 and 0.20 W m(-1) K-1 in the temperature interval 300-873 K. Experimentally, we further support the low thermal conductivity of K2Bi8Se13 using phonon velocity measurements; the results show a low average phonon velocity (1605 ms(-1)), small Young's modulus (37.1 GPa), large Gruneisen parameter (1.71), and low Debye temperature (154 K). A detailed investigation of the microstructure and defects was carried out using electron diffraction and transmission microscopy which reveal the presence of a K2.5Bi8.5Se14 minor phase intergrown along the side of the K2Bi8Se13 phase. The combination of enhanced power factor and low thermal conductivity results in a high ZT value of similar to 1.3 at 873 K in electron doped K2Bi8Se13 material.

SCI ; EI

英语

NI论文

其他

Recruitment Program for Young Professionals, the Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ 20140612140151884] ; Recruitment Program for Young Professionals, the Science, Technology and Innovation Commission of Shenzhen Municipality[KQCX2015033110182370] ; Recruitment Program for Young Professionals, the Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ20150831142508365]

Chemistry

Chemistry, Multidisciplinary

WOS:000390729500031

AMER CHEMICAL SOC

20165203182402

Bismuth compounds ; Conduction bands ; Crystal symmetry ; Elastic moduli ; Electric power factor ; Phonons ; Selenium compounds

Thermodynamics:641.1 ; High Energy Physics:932.1 ; Crystal Lattice:933.1.1 ; Materials Science:951

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
3.Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA
4.Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China
5.Natl Univ Singapore, Dept Mat Sci & Engn, 7 Engn Dr 1, Singapore 117575, Singapore
6.Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
7.Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China

Pei, Yanling,Chang, Cheng,Wang, Zhe,et al. Multiple Converged Conduction Bands in K2Bi8Se13: A Promising Thermoelectric Material with Extremely Low Thermal Conductivity[J]. Journal of the American Chemical Society,2016,138(50):16364-16371.

Pei, Yanling.,Chang, Cheng.,Wang, Zhe.,Yin, Meijie.,Wu, Minghui.,...&Zhao, Li-Dong.(2016).Multiple Converged Conduction Bands in K2Bi8Se13: A Promising Thermoelectric Material with Extremely Low Thermal Conductivity.Journal of the American Chemical Society,138(50),16364-16371.

Pei, Yanling,et al."Multiple Converged Conduction Bands in K2Bi8Se13: A Promising Thermoelectric Material with Extremely Low Thermal Conductivity".Journal of the American Chemical Society 138.50(2016):16364-16371.