Étude de couches minces piézoélectriques flexibles pour la récupération d'énergie vibratoire

Abstract : New methods for energy generation based on the ambient energy harvesting are required for autonomous sensors development and their applications in the “smart-cities”. In this context, N-air-J project aims to realize micro-generators based on flexible piezoelectric films, able to harvest energy from the breeze. The work presented in this thesis is about the deposition of lead zirconate titanate (PZT) thin layer on aluminium thin foil. Structural, dielectric, ferroelectric and piezoelectric characterizations were realized. The generator optimization is focused on the PZT transfer from aluminium to polymer substrate. The technological process has been developed for the transfer. The use of an insulating and elastic substrate is very interesting for the realization of an interdigitated (IDE) electrode configuration. Energy harvesting properties of the two configurations, PZT/Al and PZT/polymer, were tested. Energy densities were found similar to those of more rigid structures presented in the literature. The use of the IDE confirms its great interest by delivering a voltage of several tens of volts. An analytical model was developed to study the behaviour of the piezoelectric beam used in this work. Experimental studies quantify the influence of air friction on the beam vibratory behaviour. Fluid-structure interaction simulation has demonstrated the possibility for improving the deformations of several beams in a generators network.
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Thibault Dufay. Étude de couches minces piézoélectriques flexibles pour la récupération d'énergie vibratoire. Sciences de l'ingénieur [physics]. UNIVERSITE DE NANTES, 2017. Français. ⟨tel-02000299⟩

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