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Optimisation de la croissance et caractérisation de réseaux ordonnés de nanofils cœur/coquille GaAs/AlGaAs pour cellules solaires tandem sur silicium

Marco Vettori 1, 2
1 INL - H&N - INL - Hétéroepitaxie et Nanostructures
INL - Institut des Nanotechnologies de Lyon
2 INL - PV - INL - Photovoltaïque
INL - Institut des Nanotechnologies de Lyon
Abstract : The objective of this thesis is to achieve monolithical integration of Al0.2Ga0.8As-based nanowires (NWs) on Si substrates by molecular beam epitaxy via the self-assisted vapour-liquid-solid (VLS) method and develop a NWs-based tandem solar cell (TSC).In order to fulfil this purpose, we firstly focused our attention on the growth of GaAs NWs this being a key-step for the development of p-GaAs/p.i.n-Al0.2Ga0.8As core/shell NWs, which are expected to constitute the top cell of the TSC. We have shown, in particular, the influence of the incidence angle of the Ga flux on the GaAs NW growth kinetic. A theoretical model and numerical simulations were performed to explain these experimental results.Subsequently, we employed the skills acquired to grow p-GaAs/p.i.n-Al0.2Ga0.8As core/shell NWs on epi-ready Si substrates. EBIC characterizations performed on these NWs have shown that they are potential building blocks for a photovoltaic cell. We then committed to growing them on patterned Si substrates so as to obtain regular arrays of NWs. We have developed a protocol, based on a thermal pre-treatment, which allows obtaining high vertical yields of such NWs (80-90 %) on patterned Si substrates (on a surface of 0.9 x 0.9 mm2).Finally, we dedicated part of our work to define the optimal fabrication process for the TSC, focusing our attention to the development of the TSC tunnel junction, the NW encapsulation and the top contacting of the NWs.
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Marco Vettori. Optimisation de la croissance et caractérisation de réseaux ordonnés de nanofils cœur/coquille GaAs/AlGaAs pour cellules solaires tandem sur silicium. Autre. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSEC010⟩. ⟨tel-02369108⟩

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