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Changes of solar cell parameters during damp-heat exposure

 
: Zhu, J.; Koehl, M.; Hoffmann, S.; Berger, K.A.; Zamini, S.; Bennett, I.; Gerritsen, E.; Malbranche, P.; Pugliatti, P.; Di Stefano, A.; Aleo, F.; Bertani, D.; Paletta, F.; Roca, F.; Graditi, G.; Pellegrino, M.; Zubillaga, O.; Iranzo, F.J.C.; Pozza, A.; Sample, T.; Gottschalg, R.

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Fulltext urn:nbn:de:0011-n-4216613 (1.1 MByte PDF)
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Created on: 18.8.2017


Progress in Photovoltaics 24 (2016), No.10, pp.1346-1358
ISSN: 1062-7995
English
Journal Article, Electronic Publication
Fraunhofer ISE ()
Solarthermie; Optik; Photovoltaik; Silicium-Photovoltaik; feedstock; Kristallisation; wafering

Abstract
The electrical ageing of photovoltaic modules during extended damp-heat tests at different stress levels is investigated for three types of crystalline silicon photovoltaic modules with different backsheets, encapsulants and cell types. Deploying different stress levels allows determination of an equivalent stress dose function, which is a first step towards a lifetime prediction of devices. The derived humidity dose is used to characterise the degradation of power as well as that of the solar cell's equivalent circuit parameters calculated from measured currentâvoltage characteristics. An application of this to the samples demonstrates different modes in the degradation and thus enables better understanding of the module's underlying ageing mechanisms. The analysis of changes in the solar cell equivalent circuit parameters identified the primary contributors to the power degradation and distinguished the potential ageing mechanism for each types of module investigated in this paper.

: http://publica.fraunhofer.de/documents/N-421661.html