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The use of polyurethane as encapsulating method for polymer solar cells - An inter laboratory study on outdoor stability in 8 countries

: Sondergaard, R.R.; Makris, T.; Lianos, P.; Manor, A.; Katz, E.A.; Gong, W.; Tuladhar, S.M.; Nelson, J.; Tuomi, R.; Sommeling, P.; Veenstra, S.C.; Rivaton, A.; Dupuis, A.; Teran-Escobar, G.; Lira-Cantu, M.; Sapkota, S.B.; Zimmermann, B.; Würfel, U.; Matzarakis, A.; Krebs, F.C.


Solar energy materials and solar cells 99 (2012), pp.292-300
ISSN: 0927-0248
Journal Article
Fraunhofer ISE ()

A new encapsulation method for organic solar cells has been tested on flexible solar modules and cells embedded in polyurethane, sandwiched between a tempered glass plate and a polycarbonate plate. Panels, each containing 10 organic solar modules/cells, were fabricated and installed for outdoor exposure in eight different countries for 4 months. In order to minimize potential deviations in procedures and equipment, one person was responsible for the fabrication, installation and initial and final IV-measurements of the panels using the same equipment for all measurements and calibrations. The encapsulated modules/cells showed significantly reduced degradation compared with previous studies, with final average efficiencies around 40% of the original after 4 months outdoor exposure. Photodegradation was furthermore found not to be the primary source of degradation.