Light trapping in solar cells: numerical modeling with measured surface texturesReport as inadecuate

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Published in: Optics Express (ISSN: 1094-4087), vol. 23, num. 11, p. A539-A546 Washington: Optical Society of America, 2015

We present and experimentally validate a computational model for the light propagation in thin-film solar cells that integrates non-paraxial scalar diffraction theory with non-sequential ray-tracing. The model allows computing the spectral layer absorbances of solar cells with micro-and nano-textured interfaces directly from measured surface topographies. We can thus quantify decisive quantities such as the parasitic absorption without relying on heuristic scattering intensity distributions. In particular, we find that the commonly used approximation of Lambertian scattering intensity distributions for internal light propagation is violated even for solar cells on rough textured substrates. More importantly, we demonstrate how both scattering and parasitic absorption must be controlled to maximize photocurrent. (C) 2015 Optical Society of America

Note: IMT-NE Number : 801 Reference EPFL-ARTICLE-212545doi:10.1364/Oe.22.00A539View record in Web of Science

Author: Lanz, Thomas; Lapagna, Kevin; Altazin, Stephane; Boccard, Mathieu; Haug, Franz-Josef; Ballif, Christophe; Ruhstaller, Beat



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