Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Recently, hybrid organic-inorganic perovskites emerged as attractive materials due to their interesting properties, such as high light absorption coefficients, high mobility, high carrier diffusion length and tunable bandgap. The easy, versatile and cost effective deposition of perovskite thin film, combined with their excellent optoelectronic properties, induced a fast progression of perovskite-based devices, such as solar cells, light emitting diodes and photodetectors. In order to further boost the performances perovskite-based optoelectronic devices, different photonics approaches have been proposed to improve light harvesting efficiency, photoemission, and charge carrier transport. Among others, localized surface plasmon resonance (LSPR), constitutes an effective route towards near-field enhancement.[1] The inclusion of metallic nanostructures of subwavelength dimension have been intensely employed in order to improve absorption or emission in optoelectronic devices by lowering the amount of perovskite used.[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, localized surface plasmon effect of silver nanocubes embedded in methylamonium iodide thin layer is unambiguously demonstrated. A strict control over sample thickness and nanoparticles dimension is granted, carefully designed by following theoretical predictions, [4] and a thorough comparison between the sample and the reference is presented. Optical characterizations show an important improvement of absorption and photoemission at SPR frequencies, in agreement with theoretical estimation. Thus, the present work provides a reliable measure of the magnitude of the plasmonic enhancement effects expected for optoelectronic devices based on perovskite thin films.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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