Etude expérimentale de la microstructure et des propriétés électriques et optiques de couches minces et de nanofils d'oxydes métalliques (d­­­­­­-Bi­2O3 et ZnO) synthétisés par voie électrochimique

Abstract : The growing interest towards micro and nano devices has improved in the recent years. This interest arises from the need of mobility devices, energy savings or technologic innovation. The aim of the present work is to determine structural and physical properties of electrodeposited metallic oxide thin film and nanowires. The first part of this work will treat the case of bismuth oxide in delta phase. Electrodeposition method is used to stabilized the delta phase at room temperature, structure studies revealed a good cristallinity of the films and the high purity of the deposit. The stability of delta-Bi2O3 at room temperature is probably due to the nanostructuration of the deposit which had been observed in TEM experiments. The electrical behaviour of the film different from the substrate used to perform electrodeposition. We observed an excellent electrical conductivity (4*10-3 S*cm-1) from samples deposited on gilded silver, while low conductivity of the film is observed when deposit on stainless steel (10-7 S*cm-1). The second part of this work deal with zinc oxide thin film electrodeposited from aqueous solution. The experimental conditions used to perform electrodeposition have been found to influence structural and physical properties of the electrodeposited ZnO. Thermal treatment applied to electrodeposited ZnO improve the crystal quality and annealing under NH3 atmosphere at 400°C induced the formation of Zn:N bonds in the deposit. The last part of this report is related to the fabrication of ZnO nanowires using template method. This method has allowed us to restrict the growth of the ZnO into Nanopores. Observations made using TEM and HR-TEM, shows that electrodeposited nanowires are of a good crystal quality and monocrystalline. PL experiments have revealed that the emission is very close to the emission observed for the ZnO thin film
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Physics. Université Paris-Est, 2008. French. <NNT : 2008PEST0221>
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Kévin Laurent. Etude expérimentale de la microstructure et des propriétés électriques et optiques de couches minces et de nanofils d'oxydes métalliques (d­­­­­­-Bi­2O3 et ZnO) synthétisés par voie électrochimique. Physics. Université Paris-Est, 2008. French. <NNT : 2008PEST0221>. <tel-00470542>

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