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Authors: H. Shen, B. Maes
Title: Combined plasmonic gratings in organic solar cells
Format: International Journal
Publication date: 10/2011
Journal/Conference/Book: Optics Express
Volume(Issue): 19(S6) p.A1202–A1210
DOI: 10.1364/OE.19.0A1202
Citations: 67 ( - last update: 7/7/2024)
47 (OpenCitations - last update: 3/5/2024)
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We propose an organic solar cell structure with combined silver gratings consisting of both a front and a back grating. This combination provides multiple, semi-independent enhancement mechanisms which act additively, so that a broadband absorption is obtained. Both gratings couple the incident light into various plasmonic modes, showing a more localized or propagating character respectively. In addition, some modes only appear for tilted incident light, and therefore present a complex angle-dependent behavior. We provide extensive numerical simulations, resulting in an optimized period of 490nm, with front grating elements of 60 by 10nm and back elements of 60 by 30nm. With these parameters an integrated absorption enhancement factor around 1.35 is observed, with absorption increasing from 48% to 65% under TM polarized light. In addition, the solar cell with combined gratings is much less sensitive to the angle of incident light than the single grating cases. Furthermore, the grating structure does not have a large influence on the TE polarized light absorption.

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