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Investigation of Front-Side Grey Delamination in Crystalline Silicon Photovoltaic Modules
Journal
AIP Conference Proceedings
ISSN
0094243X
Date Issued
2022-08-24
Author(s)
Meena, Roopmati
Kumar, Sagarika
Gupta, Rajesh
Abstract
Front-side delamination is a commonly reported encapsulant (ethylene vinyl acetate (EVA)) degradation in crystalline silicon photovoltaic (PV) modules operating in outdoor conditions. It has a characteristic grey appearance, generally observed along busbar region of the cells in a PV module. However, it has not been analyzed in detail as an encapsulant degradation, for the cause of occurrence and loss incurring mechanism. In this paper, grey delamination has been investigated for chemical, spectral, electrical, and structural aspects of degradation. The study has been performed on field-aged modules, where loss of siloxane functional group on EVA surface has been identified as main cause of delamination. The study also identifies loss in incident radiation by reflection from delaminated surface as the major spectral effect leading to loss in quantum efficiency (QE) and electrical output power. Moreover, the possible reason of the grey appearance of the front-side delamination has been attributed to presence of pyramidal indentations on the surface of the encapsulant.
Volume
2487