Synergistic Entropy Engineering with Vacancies: Unraveling the Cocktail Effect for Extraordinary Thermoelectric Performance in SnTe-Based Materials

Xia, Junchao1; Yang, Jianmin1; Wang, Yan1; Jia, Baohai1; Li, Shangyang1; Sun, Kaitong2; Zhao, Qian2; Mao, Dasha1; Li, Hai-Feng2; He, Jiaqing1

2024-03-01

10.1002/adfm.202401635

ADVANCED FUNCTIONAL MATERIALS   影响因子和分区

1616-301X

1616-3028

["The pursuit of high-power factor and low lattice thermal conductivity simultaneously in thermoelectric research is longstanding. Herein, great success has been achieved in SnTe-based materials by employing a proposed strategy of entropy engineering involving vacancies, thus leveraging the promising cocktail effect. Significant band convergence and flatness effects have given rise to exceptionally high density of state carrier effective mass and Seebeck coefficients. These effects have also led to the theoretical optimal carrier concentration closely aligning with the actual carrier concentration. Furthermore, the entropy engineering involving vacancies has induced pronounced lattice disorder and a wealth of nanostructures, facilitating multi-scale phonon scattering. Consequently, impressive thermoelectric performance is realized in AgSb3Pb2Ge2Sn6Te15: room-temperature ZT of approximate to 0.4, peak ZT of approximate to 1.3 at 623 K, and average ZT of approximate to 1.0 (300-773 K). A thermoelectric module, comprising this p-type material and the homemade n-type PbTe, is assembled, demonstrating a competitive conversion efficiency of 9.3% at a temperature difference of 478 K. This work not only provides valuable insights into the modulation of electron/phonon transports but also establishes an effective paradigm of entropy engineering involving vacancies.","Unlike the exclusive implementation of entropy engineering or vacancy engineering in SnTe-based materials, a strategy of entropy engineering involving vacancies is proposed in this work to leverage a promising cocktail effect. The approach results in the simultaneous attainment of high power factor and low lattice thermal conductivity, culminating in extraordinary thermoelectric performance at low-medium temperatures. image"]

band modifying high entropy nanostructures synergetic optimization thermoelectric vacancy regulation

SCI ; EI

英语

第一 ; 通讯

Science and Technology Innovation Committee Foundation of Shenzhen["JCYJ20200109141205978","ZDSYS20141118160434515"] ; Science and Technology Development Fund, Macao SAR["0090/2021/A2","0049/2021/AGJ"] ; null[11934007] ; null[11874194]

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

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

WOS:001180206700001

WILEY-V C H VERLAG GMBH

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Phys, Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China
2.Univ Macau, Inst Appl Phys & Mat Engn, Ave Univ, Taipa 999078, Macao, Peoples R China

Xia, Junchao,Yang, Jianmin,Wang, Yan,et al. Synergistic Entropy Engineering with Vacancies: Unraveling the Cocktail Effect for Extraordinary Thermoelectric Performance in SnTe-Based Materials[J]. ADVANCED FUNCTIONAL MATERIALS,2024.

Xia, Junchao.,Yang, Jianmin.,Wang, Yan.,Jia, Baohai.,Li, Shangyang.,...&He, Jiaqing.(2024).Synergistic Entropy Engineering with Vacancies: Unraveling the Cocktail Effect for Extraordinary Thermoelectric Performance in SnTe-Based Materials.ADVANCED FUNCTIONAL MATERIALS.

Xia, Junchao,et al."Synergistic Entropy Engineering with Vacancies: Unraveling the Cocktail Effect for Extraordinary Thermoelectric Performance in SnTe-Based Materials".ADVANCED FUNCTIONAL MATERIALS (2024).