Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.105
Publication date: 23rd September 2021
Lead-halide perovskite (LHP) nanocrystals (NCs) have been broadly studied over the past few years as active material for several optoelectronic devices from LEDs to solar cells. Alternative approaches to colloidal synthesis have been actively explored where the absence of ligands can improve charge injection/transport without compromising material stability.
Among them, the direct synthesis of LHC NCs within metaloxide nanoporous matrices [1] has demonstrated to be a route with potential to grow stable NCs with good optoelectronic properties amenable to be incorporated into devices. [2]
In this work we use ligand-free MAPbBr3 NCs grown within SiO2 nanoporous matrices as a test-ground to study the interaction of light with LHP at the nanoscale in the presence of different atmospheres. The optical response of our system is fitted with a model that points to the simultaneous presence of light-induced activation/degradation processes strongly affected by the surrounding atmosphere. [3] The reversibility of both processes and their prevalence at the bulk/surface of the NCs is also discussed.
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