Strained endotaxial nanostructures with high thermoelectric figure of merit

Kanishka Biswas, Jiaqing He, Qichun Zhang, Guoyu Wang, Ctirad Uher, Vinayak P. Dravid, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

641 Citations (Scopus)

Abstract

Thermoelectric materials can directly generate electrical power from waste heat but the challenge is in designing efficient, stable and inexpensive systems. Nanostructuring in bulk materials dramatically reduces the thermal conductivity but simultaneously increases the charge carrier scattering, which has a detrimental effect on the carrier mobility. We have experimentally achieved concurrent phonon blocking and charge transmitting via the endotaxial placement of nanocrystals in a thermoelectric material host. Endotaxially arranged SrTe nanocrystals at concentrations as low as 2% were incorporated in a PbTe matrix doped with Na 2 Te. This effectively inhibits the heat flow in the system but does not affect the hole mobility, allowing a large power factor to be achieved. The crystallographic alignment of SrTe and PbTe lattices decouples phonon and electron transport and this allows the system to reach a thermoelectric figure of merit of 1.7 at ∼800 K.

Original languageEnglish
Pages (from-to)160-166
Number of pages7
JournalNature chemistry
Volume3
Issue number2
DOIs
Publication statusPublished - Feb 1 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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