Publication date: 15th July 2022
Over the last years, hybrid metal – semiconductor nanostructures have drawn the attention of the scientific community, due to their ability to boost the performance of optoelectronic devices via plasmon-exciton interactions. The inter-component coupling in such structures can be finely tuned by controlling the metal and/or semiconductor nanoparticle size, shape, composition and their interparticle distance. This offers great potential for high performance optoelectronic devices in diverse range of applications, including solar cells, photodetectors, light emitting diodes and laser diodes.
In this work, core-shell Au-SiO2 nanoparticles (NPs) with different core and shell diameters were synthesized and silicated via the Turkevich and Stöber methods, respectively. Bilayers of the NPs with FAPbI3 perovskite nanocrystals (NCs) have been produced. By tuning the core and shell size of the Au-SiO2 NPs, an enhancement of the light absorption and the photoluminescence intensity and decay rate of the NCs is observed in the presence of the metallic NPs compared to control, pristine NC films. The increased bilayer absorption and emission is attributed to a combination of effects that include re-absorption of light scattered by the NPs, near-field exciton-plasmon coupling and plasmon-induced resonance energy transfer.
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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