Scientific Results

Two-dimensional disorder for broadband, omnidirectional and polarization-insensitive absorption

Year: 2013

Authors: Burresi M., Pratesi F., Vynck K, Prasciolu M., Tormen M., Wiersma D.

Autors Affiliation: European Lab Nonlinear Spect LENS, I-50019 Florence, Italy; Ist Nazl Ottica CNR INO, I-50125 Florence, Italy; IOM CNR, Lab TASC, I-34149 Trieste, Italy

Abstract: The surface of thin-film solar cells can be tailored with photonic nanostructures to allow light trapping in the absorbing medium. This in turn increases the optical thickness of the film and thus enhances their absorption. Such a coherent light trapping is generally accomplished with deterministic photonic architectures. Here, we experimentally explore the use of a different nanostructure, a disordered one, for this purpose. We show that the disorder-induced modes in the film allow improvements in the absorption over a broad range of frequencies and impinging angles. (c) 2013 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 21 (5)      Pages from: A268  to: A275

More Information: We wish to thank F. Riboli and G. Conley for fruitful discussions. This work is financially supported by the European Network of Excellence Nanophotonics for Energy Efficiency, the ERC through the Advance Grant PhotBots, ENI S.p.A. Novara, CNR-EFOR, and CNR-Fotonica2015.
KeyWords: Nanostructures, Absorbing medium; Impinging angle; Light-trapping; Optical thickness; Photonic nanostructures; Polarization-insensitive; Thin-film solar cells; Optical films
DOI: 10.1364/OE.21.00A268

Citations: 42
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