Extremely Low Thermal Conductivity in Thermoelectric Ge0.55Pb0.45Te Solid Solutions via Se Substitution

Li, Junqin1,2; Wu, Haijun3,4; Wu, Di3; Wang, Caiyan1,2; Zhang, Zhiping1,2; Li, Yu1,2; Liu, Fusheng1,2; Ao, Wei-qin1,2; He, Jiaqing3

2016-09-13

10.1021/acs.chemmater.6b02772

CHEMISTRY OF MATERIALS   影响因子和分区

0897-4756

1520-5002

In this contribution, we report that an extremely low lattice thermal conductivity can be achieved in a Ge0.55Pb0.45Te-based thermoelectric system through gradually replacing Te by Se. It was revealed that substitution of Se promotes the solid solubility of Pb in GeTe, hence leading to a reduction of PbTe precipitation. The PbTe precipitation was found to completely disappear when 60% of the Te was replaced by Se. In, the optimized composition alloy (x = 0.5), the substantial percentage of solute Pb and Se atoms in the GeTe-based phase, together with the twinning microstructures in the GeTe-based matrix phase, enhances phonon scattering sufficiently, leading to extremely low thermal conductivities (0.67 and 0.45 W m(-1) K-1 at at 300 and 723 K, respectively), which are the lowest ever reported. The maximum ZT of 1.55 at 723 K was obtained in the alloy Ge0.55Pb0.45Te0.5Se0.5, which is 8 times higher than that of its Se free counterpart Ge0.55Pb0.45Te.

SCI ; EI

英语

通讯

Shenzhen Science and Technology Research Grant[JCYJ20140418182819176] ; Shenzhen Science and Technology Research Grant[JCYJ20150827155136104] ; Shenzhen Science and Technology Research Grant[JCYJ20150324141711684] ; Shenzhen Science and Technology Research Grant[ZDSYS20141118160434515] ; Shenzhen Science and Technology Research Grant[JCYJ20140612140151884]

Chemistry ; Materials Science

Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000383318500042

AMER CHEMICAL SOC

20163802815226

Germanium compounds ; IV-VI semiconductors ; Selenium ; Tellurium ; Twinning

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Crystal Growth:933.1.2

MATERIALS SCIENCE

Web of Science

1.Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen 518060, Peoples R China
2.Shenzhen Key Lab Special Funct Mat, Shenzhen 518060, Peoples R China
3.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
4.Natl Univ Singapore, Dept Mat Sci & Engn, 7 Engn Dr 1, Singapore 117575, Singapore

Li, Junqin,Wu, Haijun,Wu, Di,et al. Extremely Low Thermal Conductivity in Thermoelectric Ge0.55Pb0.45Te Solid Solutions via Se Substitution[J]. CHEMISTRY OF MATERIALS,2016,28(17):6367-6373.

Li, Junqin.,Wu, Haijun.,Wu, Di.,Wang, Caiyan.,Zhang, Zhiping.,...&He, Jiaqing.(2016).Extremely Low Thermal Conductivity in Thermoelectric Ge0.55Pb0.45Te Solid Solutions via Se Substitution.CHEMISTRY OF MATERIALS,28(17),6367-6373.

Li, Junqin,et al."Extremely Low Thermal Conductivity in Thermoelectric Ge0.55Pb0.45Te Solid Solutions via Se Substitution".CHEMISTRY OF MATERIALS 28.17(2016):6367-6373.