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Synthèse par pulvérisation cathodique de pérovskites thermochromes comme couche sélective "haute performance" d'absorbeurs solaires thermiques

Abstract : The present PhD work is focused on the study of the LaCoO3 system deposited as a thin film by reactive magnetron sputtering. The first part of this work is dedicated to the influence of the deposition parameters on the film structure. The influences of heat treatment parameters and deposition total pressure on the thermochromic transition are discussed. We have shown that it is possible to control the ratio between the cubic and rhombohedral phases as well as the size of the crystallites through the control of our parameters. In a second part, we studied in detail the properties changes using synchrotron radiation and transmission electron microscopy. Our measurements have shown that the cubic phase and the crystallites size influence the spin of cobalt atoms and therefore the nature of the Co-O bonds. We have shown that a fine microstructure and a rhombohedral phase increase the thermochromic effect and the optical switch of the transition thanks to an increase in the population density at the Fermi level and a decrease of the optical gap.
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  • HAL Id : tel-02556520, version 1

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Antoine Joseph. Synthèse par pulvérisation cathodique de pérovskites thermochromes comme couche sélective "haute performance" d'absorbeurs solaires thermiques. Matériaux. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0273⟩. ⟨tel-02556520⟩

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