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Proceedings Paper

Efficient optical analysis of surface texture combinations for silicon solar cells
Author(s): Nico Tucher; Johannes Eisenlohr; Peter Kiefel; Habtamu Gebrewold; Oliver Höhn; Hubert Hauser; Claas Müller; Jan Christoph Goldschmidt; Benedikt Bläsi
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Paper Abstract

Surface textures can significantly improve anti-reflective and light trapping properties of silicon solar cells. Combining standard pyramidal front side textures with scattering or diffractive rear side textures has the potential to further increase the light path length inside the silicon and thereby increase the solar cell efficiency. In this work we introduce the OPTOS (Optical Properties of Textured Optical Sheets) simulation formalism and apply it to the modelling of silicon solar cells with different surface textures at front and rear side. OPTOS is a matrix-based method that allows for the computationally-efficient calculation of non-coherent light propagation within textured solar cells, featuring multiple textures that may operate in different optical regimes. After calculating redistribution matrices for each individual surface texture with the most appropriate technique, optical properties like angle dependent reflectance, transmittance or absorptance can be determined via matrix multiplications. Using OPTOS, we demonstrate for example that the integration of a diffractive grating at the rear side of solar cells with random pyramids at the front results in an absorptance gain that corresponds to a photocurrent density enhancement of 0.73 mA/cm2 for a 250 μm thick cell. The re-usability of matrices enables the investigation of different solar cell thicknesses within minutes. For thicknesses down to 50 μm the simulated gain increases up to 1.22 mA/cm2. The OPTOS formalism is furthermore not restricted with respect to the number of textured interfaces. By combining two or more textured sheets to effective interfaces, it is possible to optically model a complete photovoltaic module including EVA and potentially textured glass layers with one calculation tool.

Paper Details

Date Published: 29 April 2016
PDF: 7 pages
Proc. SPIE 9898, Photonics for Solar Energy Systems VI, 98980F (29 April 2016); doi: 10.1117/12.2228294
Show Author Affiliations
Nico Tucher, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Johannes Eisenlohr, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Peter Kiefel, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Habtamu Gebrewold, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Oliver Höhn, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Hubert Hauser, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Claas Müller, Albert-Ludwigs Univ. (Germany)
Jan Christoph Goldschmidt, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Benedikt Bläsi, Fraunhofer-Institut für Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 9898:
Photonics for Solar Energy Systems VI
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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