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Slow Bloch modes for enhancing the absorption of light in thin films for photovoltaic cells

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6 Author(s)
Duche, David ; Aix-Marseille University, Institut Matériaux Microélectronique Nanosciences de Provence-IM2NP CNRS UMR 6242, Campus de Saint-Jérôme, Avenue Escadrille Normandie Niemen-Service 231, F-13397 Marseille Cedex 20, France ; Escoubas, Ludovic ; Simon, Jean-Jacques ; Torchio, Philippe
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This paper deals with the improvement of “light harvesting” in photovoltaic cells by using photonic nanostructures. We theoretically study a poly-3-hexylthiophene/[6,6]-phenyl-C61-butyric acid methyl ester (P3HT/PCBM) thin film periodically nanostructured in order to increase its absorption. The periodic nanostructuration allows “slow Bloch modes” (group velocity close to zero) to be coupled inside the material. The P3HT/PCBM photonic crystal parameters are adjusted to maximize the density of Bloch modes and obtain flat dispersion curves. The light-matter interaction is thus strongly enhanced, which results in a 35.6% increase of absorption in the 600–700 nm spectral range.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 19 )