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Croissance et propriétés de pérovskites de type LnVO₃ en couches minces pour le solaire photovoltaïque

Abstract : These thesis works deal with the study of the orthovadanate compounds LaₓVᵧO₃ then more generally on LnVO₃ thin films (where Ln = La, Ce, Pr, Nd and Sm) which seem promising for solar photovoltaic. After a research of the ideal synthesis parameters, the systems were synthesized under the form of thin films by magnetron sputtering of vanadium and lanthanide in a reactive gas mixture (Ar + O₂) followed by an ex-situ annealing in a reducing gas mixture (Ar + H₂). The first part of this thesis is focused on the study of lanthanum orthovanadates LaₓVᵧO₃ for which the lanthanum over vanadium atomic ratio (La/V) is different from the stoichiometric mixture. The morphological, structural, optical and electronic properties of the samples were studied and mainly, it is possible to demonstrate the existence of a growth window of the La / V ratio making it possible to obtain only the LaVO₃ perovskite without other parasitic phases such as lanthanum or vanadium oxides. The second part of the work relates to the development and the study of lanthanide orthovanadates LnVO₃ (where Ln = La, Ce, Pr, Nd, Sm). Differences in structural, electronic and optical properties have been observed and in the different cases, these dissimilarities have been linked to the modification of the rare earth ionic radius within the perovskite structure. For the LnVO₃ films, electrical measurements under solar simulator made it possible to demonstrate a photoconductive nature of the synthesized samples.
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Submitted on : Wednesday, May 19, 2021 - 3:18:21 PM
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  • HAL Id : tel-03230126, version 1

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Christophe Celindano. Croissance et propriétés de pérovskites de type LnVO₃ en couches minces pour le solaire photovoltaïque. Chimie. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0220⟩. ⟨tel-03230126⟩

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