Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Hybrid organic-inorganic perovskite materials have recently attracted enormous attention due to their excellent properties, such as high light absorption coefficients, high mobility, high carrier diffusion length and tunable bandgap. Thanks to these important characteristics, in combination with their easy processability, perovskite materials have become star components in optoelectronic devices, such as solar cells, light emitting diodes and photodetectors. Recently, research communities have been exploring various strategies related to light management in order to enhance the performance of optoelectronic devices. Among others, the inclusion of metallic nanostructures of subwavelength dimension giving rise to localized surface plasmon resonance (LSPR) constitutes an effective route towards near-field enhancement.[1] Such plasmonic nanostructures have been intensely employed in order to either enhance absorption in perovskite-based solar cells or to improve optoelectronic performances in perovskite based-photodetector or light emitting diodes.[2] However, in most cases there was no univocal evidence of the plasmonic resonance, since no clear spectral fingerprint of near field enhancement was observed.[3]
In this work, the localized surface plasmon effects of silver nanocubes embedded in perovskite thin layer is systematically investigated. A strict control over sample thickness and nanoparticles dimension is granted, carefully designed by following theoretical predictions,[4] and an adequate comparison between the sample and the reference is presented. A significant reinforcement of the absorption and photoemission at well-defined spectral ranges is predicted and unambiguously observed, providing a reliable measure of the magnitude of the plasmonic enhancement effects expected for optoelectronic devices based on perovskite thin films.
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