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Combining randomly textured surfaces and photonic crystals for the photon management in thin film microcrystalline silicon solar cells

: Wiesendanger, Samuel; Zilk, Matthias; Pertsch, Thomas; Rockstuhl, Carsten; Lederer, Falk

Postprint (PDF; )

Optics Express 21 (2013), Supplement 3, pp.A450-A459
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()
absorption enhancement; fabrication constraints; geometrical designs; optical nanostructures; photon management; solar cell efficiencies; spectral domains; textured surface

Photon management aims at optimizing the solar cell efficiency by, e.g., incorporating supporting optical nanostructures for absorption enhancement. Their geometrical design, however, is usually a compromise since requirements in different spectral domains need to be accommodated. This issue can be mitigated if multiple optical nanostructures are integrated. Here, we present a photon management scheme that combines the benefits of a randomly textured surface and an opaline photonic crystal. Moreover, upon considering the device with an increasing complexity, we show that a structure that respects the mutual fabrication constraints has the best performance, i.e., a device where the photonic crystal is not perfect but to some extent amorphous as enforced by the presence of the texture.