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Proceedings Paper

Photonic crystals in solar cells: a simulation approach
Author(s): Marius Peters; Marc Rüdiger; Martin Hermle; Benedikt Blaesi
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Paper Abstract

Diffractive effects have the potential to greatly increase light trapping in solar cells. The simulation of solar cells with diffractive elements is, however, difficult. The reason for this difficulty is that wave optical considerations are required. Typically, for solar cell simulations a ray tracing approach complemented by a transfer matrix algorithm is sufficient to simulate the optical properties. In this paper we present a more fundamental method to consider wave optical effects for solar cells. The optical characteristics of a solar cell are externally simulated using a wave optical approach and are used as input parameters for a simulation of the electrical characteristics. This coupled method is tested on an exemplary system; a solar cell with a backside diffractive grating. In a first step we show that substituting the optical parameters by externally simulated ones is expedient. Furthermore we show that diffractive effects, which hitherto could not be considered, can be made accessible for solar cell simulations. Additionally, the potential for a grating within a solar cell was investigated, resulting in an increase of 1% efficiency absolute for a crystalline silicon solar cell.

Paper Details

Date Published: 18 May 2010
PDF: 10 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 772514 (18 May 2010); doi: 10.1117/12.853865
Show Author Affiliations
Marius Peters, Fraunhofer Institute for Solar Energy Systems (Germany)
Marc Rüdiger, Fraunhofer Institute for Solar Energy Systems (Germany)
Martin Hermle, Fraunhofer Institute for Solar Energy Systems (Germany)
Benedikt Blaesi, Fraunhofer Institute for Solar Energy Systems (Germany)

Published in SPIE Proceedings Vol. 7725:
Photonics for Solar Energy Systems III
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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