Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.030
Publication date: 18th July 2019
Solution-processed organometallic perovskite materials have emerged since 2012 as a promising thin-film photovoltaic technology and since 2015 as promising colloidal nanostructures. The presentation will focus on recent optical spectroscopy and diffraction results on 2D multilayered halide perovskite phases, composed of perovskites multilayers sandwiched between two layers of large organic cations. Such heterostructures initially studied during the 80’s and 90’s, have recently led to the demonstration of improved solar cells photostability under standard illumination as well as humidity resistance. More, sizeable current densities on the order of a few A/cm2 have been injected in such structures for LED applications demonstrating their robustness.
The three sub-classes of monolayered 2D perovskites defined from diffraction analyses in 2017-2018 will be presented, including symmetry analyses of their electronic band structures computed by DFT. Light emission is related for many of these heterostructures to strongly Wannier bound excitons. In this case, intrinsic quantum and dielectric carrier confinements are afforded by the organic inner barriers, lead to a stable Wannier exciton at room temperature. A semi-empirical modelling of the Bethe-Salpeter has been compared to magneto-absorption results on crystalline flakes, including the deviation from 2D Rydberg series and the influence of multilayer thckness. In other situations, the distortions of the perovskite lattice may induce the dissociation of the Wannier excitons at the edges and inside the thin-films or flakes, or the formation of localized excitations, at the origin of below band gap white light emission.
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