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Etude de nanofils électrodéposés de Bi2-xSbxTe3 et Bi2Te3-xSex et de leur intégration dans des modules thermoélectriques

Abstract : Nanostructuration of thermoelectric materials seems to be the solution for their low efficiency generally encountered. Even if fair progress have been realized in manipulation of new formulations and nanostructuration of existing materials, few studies have been undertaken to develop devices for thermoelectric micro-generation or micro-cooling. In this context, bismuth antimony telluride (BixSb2-xTe3) and bismuth tellurium selenide (Bi2Te3-xSex) nanowires, have been potentiostatically electrodeposited using anodic alumina membrane. Nanowires structure, stoichiometry and thermoelectric properties have been investigated. A new method for electrical characterization have been developed, consisting in direct electrical transport measurement on a single nanowire embedded in his matrix. This method avoid oxidation effects and time-consuming processing as nanowires need no preliminary preparation and remain in their template during measurement. Thermal conductivity was also investigated using 3-omega method. The second part of this work was dedicated to first tests on n-type and p-type assembly in order to study the efficiency of TEG prototype working at ambient temperature. In parallel, a study of contact resistance (thermoelectric / metal) have been conducted.
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https://tel.archives-ouvertes.fr/tel-01556570
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Submitted on : Friday, January 26, 2018 - 3:01:39 PM
Last modification on : Thursday, November 19, 2020 - 1:01:57 PM
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  • HAL Id : tel-01556570, version 2

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CNRS | UGA | NEEL | STAR

Citation

Meriam Ben Khedim. Etude de nanofils électrodéposés de Bi2-xSbxTe3 et Bi2Te3-xSex et de leur intégration dans des modules thermoélectriques. Science des matériaux [cond-mat.mtrl-sci]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAY087⟩. ⟨tel-01556570v2⟩

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