Journal
OPTICS EXPRESS
Volume 30, Issue 14, Pages 24762-24772Publisher
Optica Publishing Group
DOI: 10.1364/OE.459571
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Funding
- Bundesministerium fur Wirtschaft und Energie [0324247-PoTaSi]
- Fraunhofer-Gesellschaft (ICON project MEEt)
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Solar cells can enhance light trapping efficiency by utilizing gratings. We present an analytical model to optimize the grating period and provide guidelines for maximizing light trapping in high-end solar cells.
Solar cells can harvest incident sunlight very efficiently by utilizing grating-based light trapping. As the working principle of such gratings strongly depends on the number as well as the propagation directions of the diffraction orders, the grating period is a key parameter. We present an analytical model for optimizing the grating period, focusing on its impact on light path enhancement and outcoupling probability. Based on the presented model, we formulate guidelines to maximize light trapping in state-of-the-art high-end solar cells. The model increases the understanding of the grating performance in systems like the III-V//Si triple junction solar cell achieving record efficiency. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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