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CPV module design optimization for advanced multi-junction solar cell concepts

: Steiner, M.; Kiefel, P.; Siefer, G.; Wiesenfarth, M.; Dimroth, F.; Krause, R.; Gombert, A.; Bett, A.W.

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Siefer, G. ; American Institute of Physics -AIP-, New York:
11th International Conference on Concentrator Photovoltaic Systems, CPV 2015 : 13–15 April 2015, Aix-les-Bains, France
Woodbury, N.Y.: AIP, 2015 (AIP Conference Proceedings 1679)
ISBN: 978-0-7354-1326-9
Art. 100005, 7 pp.
International Conference on Concentrator Photovoltaic Systems (CPV) <11, 2015, Aix-les-Bains>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; III-V und Konzentrator-Photovoltaik; Hochkonzentrierende Systeme (HCPV); modules; modeling

A network model for multi-junction solar cells has been combined with ray tracing and finite element simulations of a Fresnel lens in order to interpret experimentally derived measurement results. This combined model reveals a good agreement between simulation and measurement for advanced four-junction solar cells under a Fresnel lens when the cell-to-lens distance was varied. Thus, the effect of fill factor drop caused by distributed series resistance losses due to chromatic aberration is well described by this model. Eventually, this model is used to calculate I-V characteristics of a four-junction cell, as well as of a upright metamorphic and lattice-matched triple-junction solar cell under the illumination profile of a Fresnel lens. A significant fill factor drop at distinct cell-to-lens distances was found for all three investigated solar cell types. In this work we discuss how this fill factor drop can be avoided. It is shown that already a halving of the sheet resistance within one of the lateral conduction layer in the solar cell increases the module efficiency significantly.