Journal
SMALL
Volume 13, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201702013
Keywords
magnetic semiconductor; nanostructuring; power factor; thermal conductivity; thermoelectric
Categories
Funding
- Japan Science and Technology Agency (JST) CREST, Japan [JPMJCR15Q6]
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP16H06441]
- Materials Research by Information Integration Initiative (MI2I)
- Grants-in-Aid for Scientific Research [17H02749, 16H06441] Funding Source: KAKEN
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Thermoelectrics (TE), the direct solid-state conversion of waste heat to electricity, is a promising field with potential wide-scale application for power generation. Intrinsic conflicts in the requirements for high electrical conductivity but (a) low thermal conductivity and (b) a large Seebeck coefficient have made enhancing TE performance difficult. Several recent striking advances in the field are reviewed. In regard to the former conflict, notable bottom-up nanostructuring methods for phonon-selective scattering are discovered, namely using nanosheets, dislocations, and most strikingly a process to fabricate nano-micropores leading to a 100% enhancement in the figure of merit (ZT approximate to 1.6) for rare-earth-free skutterudites. Porous materials are hitherto considered as having poor TE performance, so this is a new paradigm. In regard to the latter conflict, nanocomposite materials with hybrid effects and use of magnetism are emerging as novel bottom-up methods to enhance TE. Material informatics efforts to identify high-ZT materials are also reviewed.
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