Phonon scattering by dislocations at grain boundaries in polycrystalline Bi0.5Sb1.5Te3

Hyun Sik Kim; Sang Il Kim; Kyu Hyoung Lee; Sung Wng Kim; G. Jeffrey Snyder

doi:10.1002/pssb.201600103

Phonon scattering by dislocations at grain boundaries in polycrystalline Bi_0.5Sb_1.5Te₃

Hyun Sik Kim, Sang Il Kim, Kyu Hyoung Lee, Sung Wng Kim, G. Jeffrey Snyder

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

Reducing lattice thermal conductivity (κ_l) of a thermoelectric material is one of the most popular strategies to improve its thermoelectric performance. Particularly, many efforts have been focused on decreasing grain size to effectively scatter low-frequency phonons by boundary scattering. In addition to the boundary scattering, we have recently demonstrated that dense arrays of dislocations formed in grain boundaries can further reduce the κ_l by dislocation scattering at room temperature and above. In order to closely examine the effect of the dislocation scattering, the κ_l of polycrystalline Bi_0.5Sb_1.5Te₃ samples with and without dislocations were measured at low temperature (T < 200 K). Because other phonon scattering mechanisms like Umklapp and point-defect scatterings are not dominant at low temperature, we clearly show the presence of the dislocation scattering in the sample with the dislocations by successfully describing its low temperature experimental κ_l with a theoretical model.

Original language	English
Article number	1600103
Journal	Physica Status Solidi (B) Basic Research
Volume	254
Issue number	5
DOIs	https://doi.org/10.1002/pssb.201600103
Publication status	Published - 2017 May

Bibliographical note

Funding Information:
The authors would like to acknowledge funding from the Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0001299. H.-S. Kim gratefully acknowledge financial support from Samsung Advanced Institute of Technology (SAIT). We also like to thank Dr. Thomas Chasapis and Riley Hanus (Northwestern University) for important discussions.

Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1002/pssb.201600103

Cite this

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title = "Phonon scattering by dislocations at grain boundaries in polycrystalline Bi0.5Sb1.5Te3 ",

abstract = "Reducing lattice thermal conductivity (κl) of a thermoelectric material is one of the most popular strategies to improve its thermoelectric performance. Particularly, many efforts have been focused on decreasing grain size to effectively scatter low-frequency phonons by boundary scattering. In addition to the boundary scattering, we have recently demonstrated that dense arrays of dislocations formed in grain boundaries can further reduce the κl by dislocation scattering at room temperature and above. In order to closely examine the effect of the dislocation scattering, the κl of polycrystalline Bi0.5Sb1.5Te3 samples with and without dislocations were measured at low temperature (T < 200 K). Because other phonon scattering mechanisms like Umklapp and point-defect scatterings are not dominant at low temperature, we clearly show the presence of the dislocation scattering in the sample with the dislocations by successfully describing its low temperature experimental κl with a theoretical model.",

author = "Kim, {Hyun Sik} and Kim, {Sang Il} and Lee, {Kyu Hyoung} and Kim, {Sung Wng} and Snyder, {G. Jeffrey}",

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AU - Snyder, G. Jeffrey

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