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

Kim, Sang Il and Lee, Kyu Hyoung and Mun, Hyeon A. and Kim, Hyun Sik and Hwang, Sung Woo and Roh, Jong Wook and Yang, Dae Jin and Shin, Weon Ho and Li, Xiang Shu and Lee, Young Hee and Snyder, G. Jeffrey and Kim, Sung Wng (2015) Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics. Science, 348 (6230). pp. 109-114. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20150424-125541234

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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 zT of 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 Bi_(0.5)Sb_(1.5)Te_3 (bismuth antimony telluride) effectively scatter midfrequency phonons, leading to a substantially lower lattice thermal conductivity. Full-spectrum phonon scattering with minimal charge-carrier scattering dramatically improved the zT to 1.86 ± 0.15 at 320 kelvin (K). Further, a thermoelectric cooler confirmed the performance with a maximum temperature difference of 81 K, which is much higher than current commercial Peltier cooling devices.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.aaa4166DOIArticle
http://www.sciencemag.org/content/348/6230/109/suppl/DC1PublisherSupplemental Materials
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2015 American Association for the Advancement of Science. Received 4 December 2014; accepted 13 February 2015. This work was supported by IBS-R011-D1, the National Research Foundation of Korea (2013R1A1A1008025), the Human Resources Development program (no. 20124010203270) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry, and Energy, and AFOSR MURI FA9550-10-1-0533.
Funders:
Funding AgencyGrant Number
Ministry of Science, ICT and Future Planning (Korea)IBS-R011-D1
National Research Foundation of Korea2013R1A1A1008025
Korea Institute of Energy Technology Evaluation and Planning (KETEP)20124010203270
Korea Government Ministry of Trade, Industry and Energy (MOTIE)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)FA9550-10-1-0533
Issue or Number:6230
Record Number:CaltechAUTHORS:20150424-125541234
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150424-125541234
Official Citation: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, and Sung Wng Kim Science 3 April 2015: 348 (6230), 109-114. [DOI:10.1126/science.aaa4166]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56961
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Apr 2015 20:16
Last Modified:06 May 2020 22:18

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