Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics

Sang Il Kim, Kyu Hyoung Lee, Hyeon A. Mun, Hyun Sik Kim, Sung Woo Hwang, Jong Wook Roh, Dae Jin Yang, Weon Ho Shin, Xiang Shu Li, Young Hee Lee, G. Jeffrey Snyder, Sung Wng Kim

Research output: Contribution to journalArticle

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Abstract

The widespread use of thermoelectric technology is constrained by a relatively low conversion efficiency of the bulk alloys, which is evaluated in terms of a dimensionless figure of merit (zT).The zTof bulk alloys can be improved by reducing lattice thermal conductivity through grain boundary and point-defect scattering, which target low-and high-frequency phonons. Dense dislocation arrays formed at low-energy grain boundaries by liquid-phase compaction in Bi0.5Sb1.5Te3 (bismuth antimony telluride) effectively scatter midfrequency phonons, leading to a substantially lower lattice thermal conductivity. Full-spectrum phonon scatteringwithminimal charge-carrier scattering dramatically improved the zT to 1.86 ± 0.15 at 320 kelvin (K). Further, a thermoelectric cooler confirmed the performance with amaximum temperature difference of 81 K, which is much higher than current commercial Peltier cooling devices.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalScience
Volume348
Issue number6230
DOIs
Publication statusPublished - 2015 Apr 3

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phonons
thermal conductivity
grain boundaries
tellurides
antimony
coolers
scattering
figure of merit
point defects
bismuth
high current
charge carriers
temperature gradients
liquid phases
low frequencies
cooling
energy

All Science Journal Classification (ASJC) codes

  • General

Cite this

Kim, S. I., Lee, K. H., Mun, H. A., Kim, H. S., Hwang, S. W., Roh, J. W., ... Kim, S. W. (2015). Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics. Science, 348(6230), 109-114. https://doi.org/10.1126/science.aaa4166
Kim, Sang Il ; Lee, Kyu Hyoung ; Mun, Hyeon A. ; Kim, Hyun Sik ; Hwang, Sung Woo ; Roh, Jong Wook ; Yang, Dae Jin ; Shin, Weon Ho ; Li, Xiang Shu ; Lee, Young Hee ; Snyder, G. Jeffrey ; Kim, Sung Wng. / Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics. In: Science. 2015 ; Vol. 348, No. 6230. pp. 109-114.
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abstract = "The widespread use of thermoelectric technology is constrained by a relatively low conversion efficiency of the bulk alloys, which is evaluated in terms of a dimensionless figure of merit (zT).The zTof bulk alloys can be improved by reducing lattice thermal conductivity through grain boundary and point-defect scattering, which target low-and high-frequency phonons. Dense dislocation arrays formed at low-energy grain boundaries by liquid-phase compaction in Bi0.5Sb1.5Te3 (bismuth antimony telluride) effectively scatter midfrequency phonons, leading to a substantially lower lattice thermal conductivity. Full-spectrum phonon scatteringwithminimal charge-carrier scattering dramatically improved the zT to 1.86 ± 0.15 at 320 kelvin (K). Further, a thermoelectric cooler confirmed the performance with amaximum temperature difference of 81 K, which is much higher than current commercial Peltier cooling devices.",
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Kim, SI, Lee, KH, Mun, HA, Kim, HS, Hwang, SW, Roh, JW, Yang, DJ, Shin, WH, Li, XS, Lee, YH, Snyder, GJ & Kim, SW 2015, 'Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics', Science, vol. 348, no. 6230, pp. 109-114. https://doi.org/10.1126/science.aaa4166

Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics. / Kim, Sang Il; Lee, Kyu Hyoung; Mun, Hyeon A.; Kim, Hyun Sik; Hwang, Sung Woo; Roh, Jong Wook; Yang, Dae Jin; Shin, Weon Ho; Li, Xiang Shu; Lee, Young Hee; Snyder, G. Jeffrey; Kim, Sung Wng.

In: Science, Vol. 348, No. 6230, 03.04.2015, p. 109-114.

Research output: Contribution to journalArticle

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AU - Hwang, Sung Woo

AU - Roh, Jong Wook

AU - Yang, Dae Jin

AU - Shin, Weon Ho

AU - Li, Xiang Shu

AU - Lee, Young Hee

AU - Snyder, G. Jeffrey

AU - Kim, Sung Wng

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