Journal
NANO LETTERS
Volume 10, Issue 8, Pages 2825-2831Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100743q
Keywords
Thermoelectric materials; thermal conductivity; nucleation and growth; semiconductors
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Funding
- Office of Naval Research
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001054]
- U.S. Department of Energy (DOE) [DE-SC0001054] Funding Source: U.S. Department of Energy (DOE)
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We show experimentally the direct reduction in lattice thermal conductivity as a result of in situ nanostructure generation within a thermoelectric material. Solid solution alloys of the high-performance thermoelectric PbTe-PbS 8% can be synthesized through rapid cooling and subsequent high-temperature activation that induces a spontaneous nucleation and growth of PbS nanocrystals. The emergence of coherent PbS nanostructures reduces the lattice thermal conductivity from similar to 1 to similar to 0.4 W/mK between 400 and 500 K.
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