Thermoelectric enhancement in PbTe with K, Na co-doping from tuning the interaction of the light and heavy hole valence bands - Condensed Matter > Materials ScienceReportar como inadecuado




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Abstract: The effect of K and K-Na substitution for Pb atoms in the rock salt latticeof PbTe was investigated to test a hypothesis for development of resonantstates in the valence band that may enhance the thermoelectric power. Wecombined high temperature Hall-effect, electrical conductivity and thermalconductivity measurements to show that K-Na co-doping do not form resonancestates but2 can control the energy difference of the maxima of the two primaryvalence sub-bands in PbTe. This leads to an enhanced interband interaction withrising temperature and a significant rise in the thermoelectric figure of meritof p-type PbTe. The experimental data can be explained by a combination of asingle and two-band model for the valence band of PbTe depending on holedensity that varies in the range of 1-15 x 10^19 cm^-3.



Autor: John Androulakis, Iliya Todorov, Duck-Young Chung, Sedat Ballikaya, Guoyu Wang, Ctirad Uher, Mercouri Kanatzidis

Fuente: https://arxiv.org/







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