Propuesta de beca de 34 meses y una de postdoctorado de 6 meses correspondiente al programa ERASMUS ARCOIRIS www.arcoiris.polito.it/ (reservado a los "no partners" es decir asociados u otros).
El deadline para aplicar es el 15 de febrero del 2012 y el candidato ya debe poseer un diploma.
Temáticas: física, ciencia de materiales sobre materiales para la industria electrónica y el trabajo se desarrollará en el IBP-Grenoble en Francia. La beca incluye los viáticos y un financiamiento de 1500 euros/mes.
Synthesis and study of structural and physical properties of multifunctional oxydes
This subject is only for Argentinean candidates (Erasmus Mundus Action 2: Arcoiris).
Web page: http://www.arcoiris.polito.it/
The purpose of this thesis project is the synthesis and the study of the structural and physical properties (electric, dielectric and magnetic) of new multipurpose materials of multiferroïc type. These materials are extremely interesting for potential applications in spintronic devices based on their various remarkable properties (colossal magneto-resistance (CMR), magnetoelectric effect, polarization of the spin).
Our goal is to work with oxyde materials (for example CuO, YbMnO3, Bi2CuMnO6, Bi2CrFeO6, Sr2TiMn O6, LaBaMn2O6) that will be synthesized in the form of thin films by Metal Organic Decomposition (MOD) technique. This will allow us to investigate the possibility of incorporating these materials in nanostructures and use them in devices of technological interest.
Optimising MOCVD growth of Oxides ZnO Nanostructures for solar photon conversion
This subject is only for Argentinean candidates (Erasmus Mundus Action 2: Arcoiris).
Web page: http://www.arcoiris.polito.it/
The purpose of this thesis project is the growth optimization of ZnO nanostructures with respect to their solar photon conversion and their implementation in energy devices by pulsed injection metal organic chemical vapor deposition (PI-MOCVD). First evaluations will lead to the selection of the more interesting precursor among Zinc acetate, zinc acetylacetonate, Zinc dicetonate or Diethyl zinc (Zn(C2H5)2). The candidate will focus on the growth parameters suitable for nanowire and/or nanofilm fabrication of ZnO on different substrates including Si-wafers and sapphire. The influence of different parameters (temperature, pulse injection, flow rates …) on the growth rate and on the growing regimes will be investigated and correlated with structural properties of the nanostructures. A special attention will be paid to the study of the first stages of the nanostructure’s growth trough ex-situ characterizations (transmission electron microscopy, X-ray reflectometry) as well as in situ substrate curvature measurements that can be modified by stress in the nanostructure (due by example to lattice mismatch between the substrate and the film).
Once the growth optimization of ZnO nanostructures is achieved at the laboratory reactor different synchrotron X ray based techniques will be implemented on an MOCVD reactor implemented at SOLEIL synchrotron radiation facilities with the aim of determining, in situ, in real time, the surface/gaz interaction, the structural properties (strain, composition, size, faceting, …) of the nucleus/islands/nanowire as well as the growth kinetics and growth mechanism.
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