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Proceedings Paper

Mimicking moth's eyes for photovoltaic applications with tapered GaP nanorods
Author(s): Silke L. Diedenhofen; Rienk E. Algra; Erik P. A. M. Bakkers; Jaime Gómez Rivas
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Paper Abstract

We demonstrate experimentally that ensembles of conically shaped GaP nanorods form layers of graded refractive index due to the increased filling fraction of GaP from the top to the bottom of the layer. Graded refractive index layers reduce the reflection and increase the coupling of light into the substrate, leading to broadband and omnidirectional antireflection surfaces. This reduced reflection is the result of matching the refractive index at the interface between the substrate and air by the graded index layer. The layers can be modeled using a transfer-matrix method for isotropic layered media. We show theoretically that the light coupling efficiency into silicon can be higher than 95% over a broad wavelength range and for angles up to 60. by employing a layer with a refractive index that increases parabolically. Broadband and omnidirectional antireflection layers are specially interesting for enhancing harvesting of light in photovoltaics.

Paper Details

Date Published: 19 August 2010
PDF: 8 pages
Proc. SPIE 7772, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion, 77720M (19 August 2010); doi: 10.1117/12.862518
Show Author Affiliations
Silke L. Diedenhofen, FOM Institute for Atomic and Molecular Physics (Netherlands)
Rienk E. Algra, Philips Research Nederland B.V. (Netherlands)
Erik P. A. M. Bakkers, Philips Research Nederland B.V. (Netherlands)
Jaime Gómez Rivas, FOM Institute for Atomic and Molecular Physics (Netherlands)

Published in SPIE Proceedings Vol. 7772:
Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion
Loucas Tsakalakos, Editor(s)

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