Strained Endotaxial PbS Nanoprecipitates Boosting Ultrahigh Thermoelectric Quality Factor in n-Type PbTe As-Cast Ingots

Liu, Shixuan1,2; Yu, Yong3; Wu, Di1,2; Xu, Xiao3; Chao, Xiaolian1,2; Yang, Zupei1,2; He, Jiaqing3

2021-10-01

10.1002/smll.202104496

Small   影响因子和分区

1613-6810

1613-6829

Lead telluride (PbTe) has long been regarded as an excellent thermoelectric material at intermediate temperature range (573-873 K); however, n-type PbTe's performance is always relatively inferior to its p-type counterpart mainly due to their different electronic band structures. In this work, an ultrahigh thermoelectric quality factor (mu/kappa(L) approximate to 1.36 x 10(5) cm(3) KJ(-1) V-1) is reported in extra 0.3% Cu doped n-type (PbTe)(0.9)(PbS)(0.1) as-cast ingots. Transmission electron microscopy (TEM) characterization reveals that excess PbS exists in PbTe matrix as strained endotaxial nanoprecipitates, which affect electrical and thermal conduction discriminately: (1) coherent PbTe/PbS lattice minimizes the interface scattering of charge carriers; (2) periodic strain centers at PbTe/PbS interface exhibit intensive strain contrast, which can strongly scatter heat-carrying phonons. Electron backscattered diffraction (EBSD) characterization illustrates very large PbTe grains (approximate to 1 mm) in these as-cast ingots, ensuring an extremely low grain boundary scattering rate thus a very high charge carrier mobility. Eventually, a remarkably high ZT(max) approximate to 1.5 at 773 K and an outstanding ZT(avg) approximate to 1.0 between 323 and 773 K are simultaneously achieved in the (PbTe)(0.9)(PbS)(0.1) +0.3%Cu sample; these values are highly competitive with reported state-of-art n-type PbTe materials.

as-cast ingots n-type PbTe periodic dislocation centers quality factor strained endotaxial nanoprecipitates

SCI ; EI

英语

通讯

Natural Science Foundation of Shaanxi Province[2021JM-201] ; National Natural Science Foundation of China[51872177,52002167,11874194,11934007,51632005] ; Guangdong-Hong Kong-Macao Joint Laboratory[2019B121205001] ; Fundamental Research Funds for the Central Universities["GK202002014","2020CBLZ010"] ; Science and Technology Play Project in Xi'an[2020KJRC0014]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000707822200001

WILEY-V C H VERLAG GMBH

20214211030097

Carrier mobility ; Coherent scattering ; Copper ; Grain boundaries ; High resolution transmission electron microscopy ; Lead compounds ; Precipitation (chemical) ; Single crystals ; Tellurium compounds

Copper:544.1 ; Electromagnetic Waves:711 ; Semiconducting Materials:712.1 ; Optical Devices and Systems:741.3 ; Chemical Operations:802.3 ; Crystalline Solids:933.1

Web of Science

1.Shaanxi Normal Univ, Sch Mat & Engn, Key Lab Macromol Sci Shaanxi Prov, Xian 710062, Peoples R China
2.Shaanxi Normal Univ, Sch Mat & Engn, Shaanxi Key Lab Adv Energy Devices, Xian 710062, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Liu, Shixuan,Yu, Yong,Wu, Di,et al. Strained Endotaxial PbS Nanoprecipitates Boosting Ultrahigh Thermoelectric Quality Factor in n-Type PbTe As-Cast Ingots[J]. Small,2021,17.

Liu, Shixuan.,Yu, Yong.,Wu, Di.,Xu, Xiao.,Chao, Xiaolian.,...&He, Jiaqing.(2021).Strained Endotaxial PbS Nanoprecipitates Boosting Ultrahigh Thermoelectric Quality Factor in n-Type PbTe As-Cast Ingots.Small,17.

Liu, Shixuan,et al."Strained Endotaxial PbS Nanoprecipitates Boosting Ultrahigh Thermoelectric Quality Factor in n-Type PbTe As-Cast Ingots".Small 17(2021).