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II-VI semiconductors 1D nanostructures for light emission

The aim of the thesis is to realize II-VI nanowires (ZnS, ZnO, ZnSe), vertically oriented, and defects free. The materials will be grown by using Metal-Organic Chemical Vapor Deposition (MOCVD), and more precisely a catalyzed process called vapour-liquid-solid (VLS) for which the nanowire growth is locally triggered and further produced under a gold droplet. The morphology and the structural properties of the grown nanowires will be accurately characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to understand the growth mechanisms. The optical properties will be investigated by micro-photoluminescence at 4K and nano-cathodoluminescence, as well as single photon emission in ZnO. Finally, complex II-VI nanostructures such as core-shell structures (e.g. ZnS nanowires covered with a thin ZnMgS layer), or ZnS/ZnSe axial quantum wells will be synthesized. The phD sudent will have the opportunity to attend and present his/her work at national and international conferences.