DOI: https://doi.org/10.29363/nanoge.emlem.2024.026
Publication date: 13th July 2024
The integration of plasmonic nanostructures into perovskites is an effective way to tailor and enhance the light-matter interactions, leading to further improvement of the already impressive intrinsic photonic properties of the perovskites. Despite significant recent progress, the complex mechanisms via which excitons, plasmons and light interact in such hybrid structures are not fully understood. Herein, we study the interactions between formamidinium lead triiodide (FAPbI3) nanocrystals (NCs) and core-shell Au/SiO2 nanoparticles (NPs) in a bilayer plasmonic-perovskite structure. By tuning the Au core and SiO2 shell size, a five-fold increase of the light absorption and luminescence can be achieved compared to the pristine FAPbI3 NC film. Based on the results from optical spectroscopy and numerical simulations, the enhancement can be attributed to a combination of far-field light scattering by the localised surface plasmon (LSP) and near-field energy transfer from the metal NP to the NC. Far-field light scattering results in photon recycling in the perovskite layer, effectively enhancing light absorption and emission. Near-field energy transfer contributes less, but maximizes for large core and small shell NPs, due to the increased spectral overlap and closer proximity of the LSP and exciton, respectively.
This work was partially financially supported by the Research and Innovation Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS" Program.
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