Manipulation of Band Degeneracy and Lattice Strain for Extraordinary PbTe Thermoelectrics.

ABSTRACT: Maximizing band degeneracy and minimizing phonon relaxation time are proven to be successful for advancing thermoelectrics. Alloying with monotellurides has been known to be an effective approach for converging the valence bands of PbTe for electronic improvements, while the lattice thermal conductivity of the materials remains available room for being further reduced. It is recently revealed that the broadening of phonon dispersion measures the strength of phonon scattering, and lattice dislocations are particularly effective sources for such broadening through lattice strain fluctuations. In this work, a fine control of MnTe and EuTe alloying enables a significant increase in density of electron states near the valence band edge of PbTe due to involvement of multiple transporting bands,

SUBMITTER: Wu Y 

PROVIDER: S-EPMC7000992 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature