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Séminaire Chimie ED459 / Chaire Total

New luminescent solar concentrator architectures based on organic-inorganic hybrid materials for emerging photovoltaic technologies

Dr. Rachel C. Evans (School of Chemistry, Trinity College, Dublin, Ireland | Professeur Invité Chaire Total Balard)

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Le Vendredi 27 février 2015 à 10h30
UM Polytech, salle de cours SC-001 (campus Triolet bâtiment 31, RdC)
Attention date et lieu inhabituels.

Luminescent solar concentrators (LSCs) can decrease the cost of solar power by reducing the number of solar cells required. The classic LSC design consists of a transparent waveguide plate that contains, or is coated with, lumophores that absorb sunlight and re-emit it at energies that match the band gap of an attached solar cell. The LSC efficiency depends on the spectral properties of the lumophore and the waveguide, as well as the device architecture. In this talk, recent progress from our group towards the design and fabrication of novel hybrid organic-inorganic LSC architectures that exhibit improved light-collecting efficiency by incorporating lumophore and waveguide components whose properties are specifically tailored for LSC requirements.

Particular focus will be placed on organic-inorganic ureasil hybrid waveguides prepared by sol-gel processing, incorporating both for organic dyes (perylene) and conjugated polymers as the lumophore. It will be shown that ureasils are superior waveguides to polyacrylates due to their optimum refractive index and high transmittance. Moreover, their processability allows us to examine the efficiency of three LSC architectures : a thin film LSC (TLSC), a doped LSC (DLSC) and a new hybrid LSC construct (HLSC) in which a thin film of the lumophore is confined below the waveguide surface. Finally, it will be revealed that by covalently grafting the lumophore to the waveguide, it is possible to control the self-organisation of the lumophore and thus its optical properties. Our results demonstrate that organic-inorganic di-ureasil polymers are excellent waveguides for LSCs and that LSC-coupled cells are a viable alternative to enhance the performance of solar technologies.

Contact ICGM : Dr. Sébastien Clément (équipe CMOS)

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