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Physical mechanisms of breakdown in multicrystalline silicon solar cells

: Kwapil, W.; Kasemann, M.; Gundel, P.; Schubert, M.C.; Warta, W.; Breitenstein, O.; Bauer, J.; Lotnyk, A.; Wagner, J.-M.; Bronsveld, P.C.P.; Coletti, G.

Volltext urn:nbn:de:0011-n-1435278 (375 KByte PDF)
MD5 Fingerprint: 7e9b494c8f0e78a4d0a0751b59eac97c
Erstellt am: 31.8.2012

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

For the construction of solar modules, the reverse characteristic of the employed solar cells is important. Diode breakdown in shaded cells can lead to hot spot development which can destroy the cell encapsulation and thus seriously damage the module. We investigated the breakdown behaviour of multicrystalline silicon solar cells. Three breakdown types are discerned: (i) Early pre-breakdown, (ii) soft breakdown related to recombination-active regions and (iii) hard avalanche breakdown at etched dislocations. We give a summary of their physical properties and their likely origin. Finally, we discuss the dangerousness of each breakdown type for solar modules.