Light Trapping in Ultrathin CIGS Solar Cells with Nanostructured Back Mirrors

Julie Goffard 1 Clément Colin 2 Fabien Mollica 3 Andrea Cattoni 1 Christophe Sauvan 4 Philippe Lalanne 5 Jean-Francois Guillemoles 3 Negar Naghavi 3 Stéphane Collin 1
1 C2N - Centre de Nanosciences et de Nanotechnologies [Marcoussis]
2 LN2 - Laboratoire Nanotechnologies Nanosystèmes
3 IRDEP - Institut de Recherche et Développement sur l'Energie Photovoltaïque
4 Laboratoire Charles Fabry / Naphel
LCF - Laboratoire Charles Fabry
5 LP2N - Laboratoire Photonique, Numérique et Nanosciences
Abstract : Novel architectures for light trapping in ultrathin Cu(In,Ga)Se 2 (CIGS) solar cells are proposed and numerically investigated. They are composed of a flat CIGS layer with nanostructured back mirrors made of highly reflective metals. Multi-resonant absorption is obtained for two different patterns of nanostructured mirrors. It leads to a dramatic increase in the short-circuit current predicted for solar cells with very thin CIGS layers. We analyze the resonance phenomena and the density of photogenerated carriers in the absorber. We discuss the impact of the material used for the buffer layer (CdS and ZnS) and the back mirror (Mo, Cu, Au, and Ag). We investigate various CIGS thicknesses from 100 to 500 nm, and we compare our numerical results with experimental data taken from the literature. We predict a short-circuit current of J sc = 33.6 mA/cm 2 for a realistic solar cell made of a 200-nm-thick CIGS absorber with a copper nanostructured mirror. It opens a way toward ultrathin CIGS solar cells with potential conversion efficiencies up to 20%.
Keywords : Absorption CIGS thin-film solar cells modeling nanophotonics nanostructures photovoltaic cells
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Journal articles
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https://hal-iogs.archives-ouvertes.fr/hal-01710935
Contributor : Christophe Sauvan <>
Submitted on : Friday, February 16, 2018 - 3:27:02 PM
Last modification on : Tuesday, May 14, 2019 - 3:08:03 PM

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Julie Goffard, Clément Colin, Fabien Mollica, Andrea Cattoni, Christophe Sauvan, et al.. Light Trapping in Ultrathin CIGS Solar Cells with Nanostructured Back Mirrors. IEEE Journal of Photovoltaics, IEEE, 2017, 7 (5), pp.1433 - 1441. ⟨10.1109/JPHOTOV.2017.2726566⟩. ⟨hal-01710935⟩

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