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Effect of intrinsic defects on the thermal conductivity of PbTe from classical molecular dynamics simulations

Abstract: Despite being the archetypal thermoelectric material, still today some of the most exciting advances in the efficiency of these materials are being achieved by tuning the properties of PbTe. Its inherently low lattice thermal conductivity can be lowered to its fundamental limit by designing a structure capable of scattering phonons over a wide range of length scales. Intrinsic defects, such as vacancies or grain boundaries, can and do play the role of these scattering sites. Here we assess the effect of these defects by means of molecular dynamics simulations. For this we purposely parametrize a Buckingham potential that provides an excellent description of the thermal conductivity of this material over a wide temperature range. Our results show that intrinsic point defects and grain boundaries can reduce the lattice conductivity of PbTe down to a quarter of its bulk value. By studying the size dependence we also show that typical defect concentrations and grain sizes realized in experiments normally correspond to the bulk lattice conductivity of pristine PbTe.

 Fuente: Journal of Physics Condensed Matter, 2020, 32(4), 045701

 Editorial: IOP Publishing

 Año de publicación: 2020

 Nº de páginas: 10

 Tipo de publicación: Artículo de Revista

 DOI: 10.1088/1361-648X/ab4aa8

 ISSN: 0953-8984,1361-648X

 Url de la publicación: https://doi.org/10.1088/1361-648X/ab4aa8