High Thermoelectric Performance in Supersaturated Solid Solutions and Nanostructured n-Type PbTe-GeTe

Luo, Zhong-Zhen; Zhang, Xiaomi; Hua, Xia; Tan, Gangjian; Bailey, Trevor P.; Xu, Jianwei; Uher, Ctirad; Wolverton, Chris; Dravid, Vinayak P.; Yan, Qingyu; Kanatzidis, Mercouri G.

doi:10.1002/adfm.201801617

Title: High Thermoelectric Performance in Supersaturated Solid Solutions and Nanostructured n-Type PbTe-GeTe

Journal Article · Wed Jun 06 00:00:00 EDT 2018 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201801617· OSTI ID:1775351

Luo, Zhong-Zhen ^[1]; Zhang, Xiaomi ^[2]; Hua, Xia ^[2]; Tan, Gangjian ^[2]; Bailey, Trevor P. ^[3]; Xu, Jianwei ^[4]; Uher, Ctirad ^[3]; Wolverton, Chris ^[2]; Dravid, Vinayak P. ^[2]; Yan, Qingyu ^[5];

^[2]

Nanyang Technological Univ. (Singapore); Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
A*STAR (Agency for Science, Technology and Research), Innovis (Singapore)
Nanyang Technological Univ. (Singapore)

Abstract Sb‐doped and GeTe‐alloyed n‐type thermoelectric materials that show an excellent figure of merit ZT in the intermediate temperature range (400–800 K) are reported. The synergistic effect of favorable changes to the band structure resulting in high Seebeck coefficient and enhanced phonon scattering by point defects and nanoscale precipitates resulting in reduction of thermal conductivity are demonstrated. The samples can be tuned as single‐phase solid solution (SS) or two‐phase system with nanoscale precipitates (Nano) based on the annealing processes. The GeTe alloying results in band structure modification by widening the bandgap and increasing the density‐of‐states effective mass of PbTe, resulting in significantly enhanced Seebeck coefficients. The nanoscale precipitates can improve the power factor in the low temperature range and further reduce the lattice thermal conductivity (κ _lat ). Specifically, the Seebeck coefficient of Pb _0.988 Sb _0.012 Te–13%GeTe–Nano approaches −280 µV K ⁻¹ at 673 K with a low κ _lat of 0.56 W m ⁻¹ K ⁻¹ at 573 K. Consequently, a peak ZT value of 1.38 is achieved at 623 K. Moreover, a high average ZT _avg value of ≈1.04 is obtained in the temperature range from 300 to 773 K for n‐type Pb _0.988 Sb _0.012 Te–13%GeTe–Nano.

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Research Organization:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Singapore MOE AcRF Tier 1; Singapore A*STAR Pharos Program; Nanyang Technological Univ.; National Science Foundation (NSF); International Institute for Nanotechnology; Keck Foundation; State of Illinois

Grant/Contract Number:: SC0014520; 61728401; RG 113/15, 2016-T1-002-065; SERC1527200022; ECCS-1542205; DMR-1121262; DE‐SC0014520; DE‐AC02‐06CH11357; DE‐AC02‐05CH11231

OSTI ID:: 1775351

Alternate ID(s):: OSTI ID: 1440785

Journal Information:: Advanced Functional Materials, Vol. 28, Issue 31; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 85 works

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Title: High Thermoelectric Performance in Supersaturated Solid Solutions and Nanostructured n-Type PbTe-GeTe

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