A newly synthesized bulk thermoelectric material that contains nanocrystals with the same orientation and
structure as the host material breaks thermoelectric efficiency records by blocking thermal, but not electrical,
Significance and Impact
A new strategy to design inexpensive materials that more efficiently convert heat to electricity.
Left: TEM image shows that strontium telluride forms 1 - 15 nm crystals
with the same orientation and structure as the surrounding lead telluride thermoelectric material.
Right: The dimensionless figure of merit (ZT) of these nanocomposites
reaches 1.7 at 815 K, better than any previously reported p-type "hole" conductor.
Reference: Kanishka Biswas, Jiaqing He, Qichun Zhang, Guoyu Wang, Ctirad Uher, Vinayak
P. Dravid and Mercouri G. Kanatzidis, Strained endotaxial
nanostructures with high thermoelectric figure of merit, Nature Chemistry
2, 160 (2011) [DOI: 10.1038/nchem.955].
Support: Work was performed at Northwestern University, Argonne National Laboratory
and the University of Michigan and supported by the Office of Naval Research and the Revolutionary Materials for Solid State
Energy Conversion (RMSSEC), an EFRC led by Don Morelli at the University of Michigan.