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Monitoring crosslinking inhomogeneities in ethylene vinyl acetate photovoltaic encapsulants using Raman microscopy

: Sanoria, A.; Ulbricht, D.; Schuster, T.; Brüll, R.


RSC Advances 5 (2015), Nr.113, S.93522-93529
ISSN: 2046-2069
Fraunhofer LBF ()

Crosslinked ethylene vinyl acetate (EVA) resin is the preferred material for encapsulation of photovoltaic (PV) modules. Yet, profiling the spatial homogeneity of crosslinking in a quantitative and non-destructive way still remains a challenge. With the aid of reference techniques and using carefully prepared and well characterized model systems we have developed a protocol for Raman microscopy, which can determine the degree of crosslinking in EVA sheets in a quantitative manner. The new method has then been applied to characterize inhomogeneities with regard to crosslinking in EVA samples on various length scales, going down to a few μm. Finally, this method has been used to study crosslinking in EVA/glass laminates. The applicability and limitations of measuring crosslinking under glass was probed.