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Temperature-dependent electroluminescence and voltages of multi-junction solar cells

: Karcher, C.; Helmers, H.; Schachtner, M.; Dimroth, F.; Bett, A.W.


Progress in Photovoltaics 22 (2014), No.7, pp.757-763
ISSN: 1062-7995
ISSN: 1099-159X
Bundesministerium für Umwelt, Naturschutz, Bau und Reaktorsicherheit BMUB
0325485D; CPV-Magnu
Journal Article
Fraunhofer ISE ()

The spectral electroluminescence of a monolithic triple-junction solar cell reveals the sub-cell open-circuit voltages under variation of temperature and carrier concentration. We present an electroluminescence set-up that is able to acquire a full spectrum in less than 10s and give insight into the voltage-extraction process. The sum of the sub-cell voltages is in excellent agreement to open-circuit voltages acquired under concentrated illumination. The temperature-induced voltage losses are investigated and explained by a bandgap dependent increase in intrinsic carrier concentration. Finally, the accurate extraction of the sub-cell bandgaps helps to identify a temperature rise with increasing current density.