Optical and electronic properties of nanowires and quantum dots structures/Propriétés optique et électroniques de nanofils et structures à boîtes quantiques

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Recent advances in the fabrication of solid-state nanowires (NWs) and quantum dots (QDs) structures open interesting avenues for photovoltaic and quantum computation applications. For instance, enhanced light to electricity conversion efficiency is expected through the insertion of QDs in the middle part of a multi-junction solar cell structure, or by using a radial P-N junction geometry for NWs-based cells. For quantum cryptography and quantum computation applications, QDs can be used as the active material of non-classical sources of photons as well as spin qubits-based logic gates. Nanostructures can be produced using state-of-the art crystal growth techniques, and then integrated into useful devices using micro- and nanofabrication processes. Optimization of the growth conditions, post-growth treatments, and fabrication processes is still necessary to control nanostructures and their layer device surrounding structural properties. Better understanding the physics of these advanced devices requires knowing precisely the influences of material and structural properties on spin relaxation, exciton states, and carrier recombination and transport mechanisms. Progresses in the field of nanotechnologies are largely attributable to group efforts involving various capabilities in designing, fabricating and characterizing nanostructure-based materials and devices. Through important research collaborations, I now have the opportunity to contribute to forefront ambitious projects in this field. I am offering specialized expertise in spectroscopy and ultrafast laser technologies to support such research activities. Recent advanced technologies are now offering a diversity of characterization tools for investigating fundamental properties of nanostructures. The main objectives of my research program are: 1) to better investigate their material- and device- characteristics through a combination of techniques that utilize either visible, near-infrared or terahertz probes and 2) to use these results for guiding realization of innovative nanostructures-based solar cell and quantum computing devices.