Enhanced thermoelectric figure of merit in polycrystalline carbon nanostructures

Enhanced thermoelectric figure of merit in polycrystalline carbon nanostructures

Thomas Lehmann,1,2 Dmitry A. Ryndyk,1,2,3 and Gianaurelio Cuniberti1,2,3 1Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany 2Dresden Center for Computational Materials Science (DCMS), TU Dresden, 01062 Dresden, Germany 3Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany (Received 6 January 2015; revised manuscri...

Enhanced thermoelectric figure of merit in thin GaAs nanowires.

Combining density functional theory and the nonequilibrium Green's function method, we investigate the thermoelectric properties of thin GaAs nanowires (NWs). After identifying the most stable structures for GaAs NWs, either in wurtzite (wz) or zinc blende (zb) stacking, we present a systematic analysis on the thermoelectric properties of these NWs and their dependence on stacking type (wz or z...

Phase transition enhanced thermoelectric figure-of-merit in copper chalcogenides

Enhanced thermoelectric figure of merit of p-type half-Heuslers.

Half-Heuslers would be important thermoelectric materials due to their high temperature stability and abundance if their dimensionless thermoelectric figure of merit (ZT) could be made high enough. The highest peak ZT of a p-type half-Heusler has been so far reported about 0.5 due to the high thermal conductivity. Through a nanocomposite approach using ball milling and hot pressing, we have ach...

Carbon fiber polymer–matrix structural composites exhibiting greatly enhanced through-thickness thermoelectric figure of merit

The through-thickness thermoelectric behavior of continuous carbon fiber epoxy-matrix composites is greatly improved by adding tellurium particles (13 vol.%), bismuth telluride particles (2 vol.%) and carbon black (2 vol.%). The thermoelectric power is increased from 8 to 163 lV/K, the electrical resistivity is decreased from 0.17 to 0.02.X.cm, the thermal conductivity is decreased from 1.31 to...