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Authors: K. Quang Le, A. Abass, B. Maes, P. Bienstman, Andrea Alu
Title: Comparing plasmonic and dielectric gratings for absorption enhancement in thin-film organic solar cells
Format: International Journal
Publication date: 1/2012
Journal/Conference/Book: Optics Express
Editor/Publisher: Optical Society of America, 
Volume(Issue): 20(S1) p.A39-A50
DOI: 10.1364/oe.20.000a39
Citations: 84 ( - last update: 26/5/2024)
56 (OpenCitations - last update: 3/5/2024)
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We theoretically investigate and compare the influence of square silver gratings and one-dimensional photonic crystal (1D PC) based nanostructures on the light absorption of organic solar cells with a thin active layer. We show that, by integrating the grating inside the active layer, excited localized surface plasmon modes may cause strong field enhancement at the interface between the grating and the active layer, which results in broadband absorption enhancement of up to 23.4%. Apart from using silver gratings, we show that patterning a 1D PC on top of the device may also result in a comparable broadband absorption enhancement of 18.9%. The enhancement is due to light scattering of the 1D PC, coupling the incoming light into 1D PC Bloch and surface plasmon resonance modes.

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