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Enhancing perovskite solar cells through upconversion nanoparticles insertion

Abstract : Renewable energies represent nowadays one of the keys that can tackle at the same time energy supply needs and a sustainable environmental behavior. Photovoltaic devices convert the energy of sunlight into electricity, and solar energy remains one of the most common renewable energy sources. In the search for cost-effective solar cells, the recently discovered solution-processable hybrid organic-inorganic perovskites are considered as one of the most important candidates. They belong to the category of thin-film technologies and require much less and as abundant resource than Si. One limiting parameter of such photovoltaic devices is however the absorption of low-energy photons (wavelength over 800 nm, the near-infrared range). In order to address this specific loss of sub bandgap photons’ absorption, this PhD thesis aims to develop plasmonic-enhanced upconversion approaches to extend the spectral sensitivity of organo-metal halide perovskite solar cells to the near-IR spectrum. Near-infrared-to-visible up-conversion fluorescent materials can be used to widen the part of the spectrum used for electric current generation. Two low-energy photons are added up in order to give a higher energy photon. However, this effect has a rather small efficiency. This effect being quite inefficient, the idea is to combine those particles with metallic nanoparticles, that have the property to enhance electromagnetic field intensity at a certain wavelength (this is called plasmonic effect). By combining both types of particles, we thus enhance the activity of up-conversion materials (higher emission). Once implemented in a perovskite solar cell, this increases its efficiency.
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Mathilde Schoenauer. Enhancing perovskite solar cells through upconversion nanoparticles insertion. Materials. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS369⟩. ⟨tel-02865362⟩

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