Combination of large nanostructures and complex band structure for high performance thermoelectric lead telluride
- 29 July 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 4 (9), 3640-3645
- https://doi.org/10.1039/c1ee01928g
Abstract
The complexity of the valence band structure in p-type PbTe has been shown to enable a significant enhancement of the average thermoelectric figure of merit (zT) when heavily doped with Na. It has also been shown that when PbTe is nanostructured with large nanometer sized Ag2Te precipitates there is an enhancement of zT due to phonon scattering at the interfaces. The enhancement in zT resulting from these two mechanisms is of similar magnitude but, in principle, decoupled from one another. This work experimentally demonstrates a successful combination of the complexity in the valence band structure with the addition of nanostructuring to create a high performance thermoelectric material. These effects lead to a high zT over a wide temperature range with peak zT > 1.5 at T > 650 K in Na-doped PbTe/Ag2Te. This high average zT produces 30% higher efficiency (300–750 K) than pure Na-doped PbTe because of the nanostructures, while the complex valence band structure leads to twice the efficiency as the related n-type La-doped PbTe/Ag2Te without such band structure complexity.Keywords
This publication has 38 references indexed in Scilit:
- Convergence of electronic bands for high performance bulk thermoelectricsNature, 2011
- High thermoelectric figure of merit in heavy hole dominated PbTeEnergy & Environmental Science, 2011
- Strained endotaxial nanostructures with high thermoelectric figure of meritNature Chemistry, 2011
- Impurity clustering and impurity-induced bands in PbTe-, SnTe-, and GeTe-based bulk thermoelectricsPhysical Review B, 2010
- Nanostructured Thermoelectrics: The New Paradigm?Chemistry of Materials, 2009
- Bulk nanostructured thermoelectric materials: current research and future prospectsEnergy & Environmental Science, 2009
- Enhancement of Thermoelectric Efficiency in PbTe by Distortion of the Electronic Density of StatesScience, 2008
- Complex thermoelectric materialsNature Materials, 2008
- Ab initiostudies of the electronic structure of defects in PbTePhysical Review B, 2006
- Cubic AgPb
m
SbTe 2+
m
: Bulk Thermoelectric Materials with High Figure of MeritScience, 2004