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Réalisation et étude des propriétés thermoélectriques de couches minces et nanofils de types Bi2-XSbxTe3 et Bi2Te3-xSex

Abstract : Recent studies showed that thermoeletrical performances are larger for thin films (factor 3) than for bulk materials. We chose to develop p-type Bi0,5Sb1,5Te3 and n-type Bi2Te2,7Se0,3 thermoelectrical thin films in order to work at room temperature. Thin films have been realized using magnetron sputtering process. The optimisation of the deposition conditions (Ar pressure, power plasma, target-substrate distance, deposition time) as well as the annealing treatments has helped to obtain figure of merits as high as possible. On the other hand, the physical mechanisms in thin films are different than those of bulk materials so it was necessary to study such mechanisms for a better understanding. In parallel, we explore the possibility to grow thermoelectrical wires with nanometric dimensions inside of a nanoporous alumina matrix. It has been recently shown theoretically and experimentally that thermoelectrical properties are strongly improved when the nanometric dimensions are obtained.
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Submitted on : Monday, March 14, 2011 - 9:37:13 AM
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Cedric Giroud-Garampon. Réalisation et étude des propriétés thermoélectriques de couches minces et nanofils de types Bi2-XSbxTe3 et Bi2Te3-xSex. Autre [cond-mat.other]. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENY004⟩. ⟨tel-00576282⟩

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