Comptes Rendus
no. 10
Thermoelectric mesoscopic phenomena / Phénomènes thermoélectriques mésoscopiques
Nanostructuration for thermoelectricity: The path to an unlimited reduction of phonon transport
[Nanostructuration pour la thermoélectricité : la voie vers une diminution illimitée du transport phonique]
Shiyun Xiong1  ; Sebastian Volz1
1 Laboratoire d'énergétique moléculaire et macroscopique, combustion, UPR CNRS 288, CentraleSupélec, 92295 Châtenay Malabry, France
Comptes Rendus. Physique, Volume 17 (2016) no. 10, pp. 1146-1153.

L'amélioration des propriétés thermoélectriques des matériaux massifs est souvent liée à la réduction de leur conductivité thermique, qui est principalement basée sur la propagation des phonons. Réduire encore plus le transport des phonons reste une tâche difficile, parce que les matériaux thermoélectriques usuels sont déjà de bons isolants thermiques, mais aussi du fait de la largeur du spectre de Planck des phonons. La nano-structuration a fourni de nouveaux moyens pour décroître la conduction thermique, particulièrement par le biais de structures diffusantes, qu'elles soient des nano-objets, des surfaces ou des interfaces. Dans ce chapitre, la physique des méthodes éprouvées visant les échelles nanométriques pour réduire la conduction thermique est décrite, accompagnée d'illustrations directement tirées des simulations.

Improvements of the thermoelectric properties in bulk materials have very often relied on the reduction of thermal conductivity, which is mostly based on phonon propagation. Reducing further phonon transport has remained a difficult task due to the fact that current thermoelectric materials are already efficient thermal insulators, and also because of the broadness of the Planckian phonon spectrum. Nanostructuring has provided new paths for decreasing thermal conduction, especially by means of scatterers, be them nano-objects, surfaces, or interfaces. In this chapter, the physics of demonstrated nanoscale methodologies for the reduction of thermal conduction will be proposed together with illustrations from direct simulations.

Publié le :
DOI : 10.1016/j.crhy.2016.08.009
Keywords: Hybridization, Alloying, Resonators
Mot clés : Hybridation, Alliage, Résonateurs
Shiyun Xiong 1 ; Sebastian Volz 1

1 Laboratoire d'énergétique moléculaire et macroscopique, combustion, UPR CNRS 288, CentraleSupélec, 92295 Châtenay Malabry, France 
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Shiyun Xiong; Sebastian Volz. Nanostructuration for thermoelectricity: The path to an unlimited reduction of phonon transport. Comptes Rendus. Physique, Volume 17 (2016) no. 10, pp. 1146-1153. doi : 10.1016/j.crhy.2016.08.009. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.08.009/

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