DOI: https://doi.org/10.29363/nanoge.emlem.2022.027
Publication date: 15th July 2022
Lead-halide perovskite nanocrystals (NCs) have emerged as attractive nano-building blocks for photovoltaics and optoelectronic devices. Optimization of perovskite NC-based devices relies on a better knowledge of the fundamental electronic and optical properties of the band-edge exciton, whose fine structure has long been debated. This talk will give an overview of our recent magneto-optical spectroscopic studies [1-5] revealing the entire excitonic fine structure and relaxation mechanisms in these materials, using a single-NC approach to get rid of the inhomogeneities in the NC morphologies and crystal structures. Moreover, it will highlight universal scaling laws relating the exciton fine structure splitting, the trion and biexciton binding energies to the band-edge exciton energy in lead-halide perovskite nanocrystals, regardless of their chemical composition (inorganic and hybrid organic-inorganic, as well as mixed halide alloys) and their spectral emission range (from the blue to the near infrared). These scaling laws offer a general predictive picture for the charge-carrier interactions in these emerging materials, from the bulk regime to the regime of highly confined carriers.
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