Elaboration électrochimique en mode pulsé de tellurure de bismuth Bi2Te3 et de l'alliage ternaire (Bi1-xSbx)2Te3

Abstract : The objective of this work is the pulsed electrodeposition of thermoelectric materials, which can be used for the manufacture of heat transfer modules. This advanced form of electrodeposition is often mentioned in the literature to improve the morphology of deposits. The aimed materials are compounds of bismuth telluride family.The first part of this work has been dedicated to the study of fundamental phenomena operating in pulse mode. The nucleation type was determined, which is 3D instantaneous type. The charge and mass transfer phenomena were identified, allowing the definition of an optimal deposition range. Finally, the parameters giving the optimal morphology have been determined.The syntheses of 5 m thickness Bi2Te3 films have been carried out. Deposits having an excess of bismuth or an excess of tellurium were obtained by varying pulse parameters and the electrolyte composition. Thermoelectric properties measure underlined that the association of pulse mode and annealing allows to obtaining deposits more efficient than in continuous mode.The last part has been dedicated to the synthesis in pulse mode of antimony ternary compounds. The study of the composition showed that it is necessary to increase the quantity of bismuth and antimony in the electrolyte to obtain the stoichiometry Bi0.5Sb1.5Te3. The measure of physic properties evidenced p-type conductivity directly after synthesis as well as the interest of pulse mode to improve the electrical resistivity of films
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Virginie Richoux. Elaboration électrochimique en mode pulsé de tellurure de bismuth Bi2Te3 et de l'alliage ternaire (Bi1-xSbx)2Te3. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ020S⟩. ⟨tel-01752587⟩

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