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Electrodeposition of low dimensional thermoelectric materials : the case of SnSe

Abstract : Since recent works highlighting its high figure of merit (2.6 at 923 K), SnSe is fingered as promising candidate for thermoelectric applications. Mainly synthesized by physical way and in bulk shape, few works present the elaboration of SnSe at a decreased dimensionality. However, it was shown that the thermal conductivity of thermoelectric materials is considerably reduced at low dimensionality. A synthesis method which is particularly suitable to the elaboration of low dimensionality deposits is the electrodeposition, poorly used for SnSe. In this thesis, the electrodeposition of SnSe was thus thoroughly discussed. In continuous mode, the influence of the potential on the films composition and morphology was studied from an innovative electrochemical bath, regarding the literature. The conditions providing the best films were preserved in order to study the pulse mode syntheses. The pulse conditions have also proved to be decisive on the composition and morphology of the films. As first prospect of this work, doping with copper was investigated from the best pulse conditions. As second promising prospect, this thesis work was extended to the electrodeposition of SnSe nanowires and nanotubes. These 1D nanostructures, synthesized in continuous mode, show an evolution of the crystallinity, of the composition and even of the morphology with the potential.
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Submitted on : Tuesday, October 19, 2021 - 12:01:38 PM
Last modification on : Sunday, June 26, 2022 - 3:16:40 AM
Long-term archiving on: : Thursday, January 20, 2022 - 6:51:57 PM


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Mélanie de Vos. Electrodeposition of low dimensional thermoelectric materials : the case of SnSe. Chemical Sciences. Université de Lorraine, 2021. English. ⟨NNT : 2021LORR0128⟩. ⟨tel-03385015⟩



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