Photoinduced Migration of Ions in Optically Resonant Perovskite Nanoparticles


Organic–inorganic perovskites with a mixed anion composition are widely used in solar cells, light-emitting diodes, and nanophotonic structures. Light nanosources based on resonant perovskite nanoparticles are of particular interest. However, perovskites with such a composition demonstrate the light-induced segregation of anions, which leads to a reversible dynamic rearrangement of the optical properties of a material and photoluminescence spectra. In this work, the photoinduced process of change in optical properties in resonant hybrid perovskite nanoparticles with a mixed anion composition (MAPbBr₁.₅I₁.₅, where MA = NH₃CH₃⁺) has been studied. Comparison with a similar process in a perovskite thin film with a similar composition has shown that the photoinduced migration of halogen ions in a nanoparticle occurs cyclically. This is due to the competition of two processes: the concentration of ions near the boundaries of the particle and migration caused by the gradient of the density of light-generated electron–hole pairs. This effect in resonant nanoparticles makes it possible to obtain optically tunable nanoantennas.


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Perovskite, Anions, Halogens, Photoluminescence, Nanoparticles

This work was supported by the Ministry of Education and Science of the Russian Federation (project no. 14.Y26.31.0010 for the experimental part and project no. 16.8939.2017/8.9 for the calculations).


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