Fluorescence imaging for analysis of the degradation of PV-modules

Fluorescence detection is presented as a tool for the investigation of EVA degradation that is used as encapsulant in PV-modules. The superior sensitivity of our set-up allows an early assessment of ageing processes in EVA already after 20h damp-heat exposure. A newly developed scanning system enables the laterally resolved inspection of entire PV modules. We also report the evaluation of outdoor weathered crystalline Si-modules demonstrating that besides ageing of EVA cracks of cells are well detectable, too.