Enhanced Density-of-States Effective Mass and Strained Endotaxial Nanostructures in Sb-Doped Pb0.97Cd0.03Te Thermoelectric Alloys

Tan, Gangjian; Zhang, Xiaomi; Hao, Shiqiang; Chi, Hang; Bailey, Trevor P.; Su, Xianli; Uher, Ctirad; Dravid, Vinayak P.; Wolverton, Chris; Kanatzidis, Mercouri G.

doi:10.1021/acsami.8b21524

Title: Enhanced Density-of-States Effective Mass and Strained Endotaxial Nanostructures in Sb-Doped Pb_0.97Cd_0.03Te Thermoelectric Alloys

Journal Article · Mon Feb 04 00:00:00 EST 2019 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.8b21524· OSTI ID:1777374

^[1]; Zhang, Xiaomi ^[2]; Hao, Shiqiang ^[2]; Chi, Hang ^[3]; Bailey, Trevor P. ^[3];

^[1]; Uher, Ctirad ^[3];

^[2];

^[2]

Wuhan Univ. of Technology (China)
Northwestern Univ., Evanston, IL (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Here we report that CdTe alloying and Sb doping increase the density-of-states effective mass and introduce endotaxial nanostructuring in n-type PbTe, resulting in enhanced thermoelectric performance. A prior theoretical prediction for the presence of resonance states in the conduction band of this system, however, could not be confirmed. An amount of 3 mol % CdTe alloying widens the band gap of PbTe by 50%, leading to enhanced carrier effective mass and Seebeck coefficient. This effect is even more pronounced at high temperatures where the solubility of CdTe increases. At 800 K, when the carrier concentration is the same (4 × 10¹⁹ cm^-3), the Seebeck coefficient of CdTe-alloyed PbTe is -195 μV K^-1, 16% higher than that of the Cd-free control sample (-168 μV K^-1). Sb doping considerably increases the electron concentration of Pb_0.97Cd_0.03Te, giving rise to optimized power factors of ~17 μW cm^-1 K^-2 at 800 K. More importantly, Sb induces strained endotaxial nanostructures evenly distributed in the matrix. Furthermore, these Sb-rich nanostructures account for the ~40% reduction in the lattice thermal conductivity over the whole measured temperature range. As a result, a maximum ZT of 1.2 is attained at 750 K in 0.5 mol % Sb-doped Pb_0.97Cd_0.03Te alloys.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Science Foundation of China

Grant/Contract Number:: SC0014520; 11804261

OSTI ID:: 1777374

Journal Information:: ACS Applied Materials and Interfaces, Vol. 11, Issue 9; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 52 works

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Title: Enhanced Density-of-States Effective Mass and Strained Endotaxial Nanostructures in Sb-Doped Pb0.97Cd0.03Te Thermoelectric Alloys

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Title: Enhanced Density-of-States Effective Mass and Strained Endotaxial Nanostructures in Sb-Doped Pb_0.97Cd_0.03Te Thermoelectric Alloys