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Couches minces de chalcogénures de zinc déposées par spray-CVD assisté par rayonnement infrarouge pour des applications photovoltaïques

Abstract : In the field of photovoltaic devices, organic and CIGS-based solar cells are both promising way to compete with silicon-based technologies for low and high power generation. In order to provide safe and cost-effective thin films for these devices, zinc chalcogenides layers represent interesting opportunities to replace indium (expensive) and cadmium-based (toxic) layers. Semiconductors like Zn1-xMgxO and ZnS had been synthesized using an infrared assisted spray-CVD apparatus. The interaction between an aerosol and the infrared radiation is the main innovation in this process and sparked off many advantages. With this simple, vacuum-free and chemical soft technique, Zn1-xMgxO thin films exhibit excellent optical transparency, high electrical conductivity and an easily band gap adjustment. The obtained properties, compared with those reported by other traditional techniques, classed infrared assisted spray-CVD as an interesting and promising alternative technique in order to deposit thin films for such applications. ZnS thin films had been prepared with an original chemical precursor which enable to work without ZnCl2, the traditional corrosive chemical precursor in spray pyrolysis. In addition to that, some transparent conductive oxides (TCO) had been investigated by doping ZnO and Zn1-xMgxO layers with aluminum and/or gallium. With a very high optical transparency and a resistivity as low as 10-3 Ω.cm, ZnO:Al exhibit workable properties as transparent electrodes. Indeed, inverted organic solar cells had been realized with those TCO and proved their well-functioning into such devices.
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Vincent Froger. Couches minces de chalcogénures de zinc déposées par spray-CVD assisté par rayonnement infrarouge pour des applications photovoltaïques. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2012. Français. ⟨NNT : 2012ENAM0040⟩. ⟨tel-00797548v2⟩

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