Thermoelectric materials offer ways to transform heat to electrical energy and vice versa. Here, the authors tailor the architecture of a bulk thermoelectric material, the semiconductor lead telluride, to maximize thermoelectric performance. They achieve phonon scattering on three different length scales. Atomic-scale doping, nanometer-scale endotaxial precipitation and mesoscale grain-boundary structures were introduced to the material to drastically reduce its thermal conductivity and subsequently achieve a very high thermoelectric figure of merit. These advances could aid in the design of advanced thermoelectric materials that can be used to recover waste heat.
Materials scienceThe matryoshka effect (News & Views p375, doi: 10.1038/489375a)
- High-performance bulk thermoelectrics with all-scale hierarchical architectures (Letter p414, doi: 10.1038/nature11439)
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