Grain Boundary Engineering for Achieving High Thermoelectric Performance in n-Type Skutterudites

Meng, Xianfu; Liu, Zihang; Cui, Bo; Qin, Dandan; Geng, Huiyuan; Cai, Wei; Fu, Liangwei; He, Jiaqing; Ren, Zhifeng; Sui, Jiehe

doi:10.1002/aenm.201602582

Title: Grain Boundary Engineering for Achieving High Thermoelectric Performance in n-Type Skutterudites

Journal Article · Fri Feb 17 00:00:00 EST 2017 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201602582· OSTI ID:1388361

Meng, Xianfu ^[1]; Liu, Zihang ^[1]; Cui, Bo ^[1]; Qin, Dandan ^[1]; Geng, Huiyuan ^[1]; Cai, Wei ^[1]; Fu, Liangwei ^[2]; He, Jiaqing ^[2]; Ren, Zhifeng ^[3]; Sui, Jiehe ^[1]

Harbin Inst. of Technology, Harbin (China)
South Univ. of Science and Technology of China, Shenzhen (China)
Univ. of Houston, Houston, TX (United States)

Grain or phase boundaries play a critical role in the carrier and phonon transport in bulk thermoelectric materials. Previous investigations about controlling boundaries primarily focused on the reducing grain size or forming nanoinclusions. Herein, liquid phase compaction method is first used to fabricate the Yb‐filled CoSb ₃ with excess Sb content, which shows the typical feature of low‐angle grain boundaries with dense dislocation arrays. Seebeck coefficients show a dramatic increase via energy filtering effect through dislocation arrays with little deterioration on the carrier mobility, which significantly enhances the power factor over a broad temperature range with a high room‐temperature value around 47 μW cm ⁻² K ⁻¹ . Simultaneously, the lattice thermal conductivity could be further suppressed via scattering phonons via dense dislocation scattering. As a result, the highest average figure of merit ZT of ≈1.08 from 300 to 850 K could be realized, comparable to the best reported result of single or triple‐filled Skutterudites. This work clearly points out that low‐angle grain boundaries fabricated by liquid phase compaction method could concurrently optimize the electrical and thermal transport properties leading to an obvious enhancement of both power factor and ZT .

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001299; FG02-09ER46577; DE‐SC0001299

OSTI ID:: 1388361

Alternate ID(s):: OSTI ID: 1398281

Journal Information:: Advanced Energy Materials, Vol. 7, Issue 13; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 169 works

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36 MATERIALS SCIENCE
solar (photovoltaic)
solar (thermal)
solid state lighting
phonons
thermal conductivity
thermoelectric
defects
mechanical behavior
charge transport
spin dynamics
materials and chemistry by design
optics
synthesis (novel materials)
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Title: Grain Boundary Engineering for Achieving High Thermoelectric Performance in n-Type Skutterudites

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