Scientific Results

Photon management in two-dimensional disordered media

Year: 2012

Authors: Vynck K., Burresi M., Riboli F., Wiersma D.

Autors Affiliation: European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy;
Istituto Nazionale di Ottica (CNR-INO), Largo Fermi 6, 50125 Firenze (FI), Italy

Abstract: Elaborating reliable and versatile strategies for efficient light coupling between free space and thin films is of crucial importance for new technologies in energy efficiency. Nanostructured materials have opened unprecedented opportunities for light management, notably in thin-film solar cells(1,2). Efficient coherent light trapping has been accomplished through the careful design of plasmonic nanoparticles and gratings(3,4), resonant dielectric particles(5,6) and photonic crystals(7-10). Alternative approaches have used randomly textured surfaces(11-13) as strong light diffusers to benefit from their broadband and wide-angle properties. Here, we propose a new strategy for photon management in thin films that combines both advantages of an efficient trapping due to coherent optical effects and broadband/wide-angle properties due to disorder. Our approach consists of the excitation of electromagnetic modes formed by multiple light scattering and wave interference in two-dimensional random media. We show, by numerical calculations, that the spectral and angular responses of thin films containing disordered photonic patterns are intimately related to the in-plane light transport process and can be tuned through structural correlations. Our findings, which are applicable to all waves, are particularly suited for improving the absorption efficiency of thin-film solar cells and can provide a new approach for high-extraction-efficiency light-emitting diodes.

Journal/Review: NATURE MATERIALS

Volume: 11 (12)      Pages from: 1017  to: 1022

More Information: This work is supported by the Eu NoE Nanophotonics for Energy Efficiency, the Italian CNR project EFOR and ENI S.p.A. We gratefully acknowledge P. Barthelemy, J. Bertolotti and T. Svensson for insightful discussions.
DOI: 10.1038/NMAT3442

Citations: 207
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English