Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 4, Issue 6, Pages 2085-2089Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ee00456a
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Funding
- NASA-JPL
- DARPA
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Thermoelectric transport properties of p-type PbTe:Na, with high hole concentrations of approximately 10(20) cm(-3), are reinvestigated from room temperature to 750 K. The greatly enhanced Seebeck coefficient at these doping levels can be understood by the presence of a sharp increase in the density of states around the Fermi level. As a result, the thermoelectric figure of merit, zT, reaches similar to 1.4 at 750 K. The influence of these heavy hole carriers may contribute to a similarly high zT observed in related p-type PbTe-based systems such as Tl-doped PbTe and nanostructured composite materials.
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