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43 % direct sunlight conversion efficiency using 4J cell with achromatic full glass lens

: Steiner, M.; Siefer, G.; Schmidt, T.; Wiesenfarth, M.; Dimroth, F.; Bett, A.W.

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Wiesenfarth, M. ; American Institute of Physics -AIP-, New York:
12th International Conference on Concentrator Photovoltaic Systems, CPV 2016 : 25-27 April 2016, Freiburg, Germany
Melville/NY: AIP Publishing, 2016 (AIP Conference Proceedings 1766)
ISBN: 978-0-7354-1424-2
Art. 080006, 7 pp.
International Conference on Concentrator Photovoltaic Systems (CPV) <12, 2016, Freiburg>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Materialien - Solarzellen und Technologie; Photovoltaik; III-V und Konzentrator-Photovoltaik; III-V Epitaxie und Solarzellen; Konzentrator-Optik; Hochkonzentrierende Systeme (HCPV); glass lens; fresnel lens; chromatic aberration; record efficiency; 4j cell; optical efficiency

In this work a direct conversion of sunlight with an efficiency of 43.4 % is demonstrated with a CPV mini-module. The mini-module consists of an achromatic full-glass lens and a wafer-bonded four-junction solar cell mounted to a heat sink. The 43.4 % efficiency was determined at IEC 62630-1 concentrator standard test conditions. The electrical characteristic of the full-glass lens mini-module was compared to a mini-module using a Fresnel lens. The Fresnel lens mini-module is affected by chromatic aberration whereas the impact of chromatic aberration on the full-glass lens mini-module is negligible. The measurement data gathered from the mini-modules is compared to a calculation performed with a combined ray tracing and network model. The comparison of model and simulation shows a good agreement. The simulation is used to demonstrate the series resistance losses due to lateral current flows caused by chromatic aberration.