Towards the Origin of Photochemical EVA Discoloration

Cornelia Peike, Lea Purschke, Karl Anders Weiss, Michael Kohl, Michael Kempe

Research output: Contribution to conferencePaperpeer-review

36 Scopus Citations


The root cause of the photochemical ethylene vinyl acetate (EVA) discoloration in photovoltaic (PV) modules was investigated. Laminates containing EVA foils with a systematic variation of the additive formulation, i.e. the crosslinking agents, ultraviolet (UV) absorber, hindered amine light stabilizers and antioxidants, were subjected to UV aging. The influence of the additive combination on the photochemical aging of E VA was investigated by Raman spectroscopy, Fourier transform infrared spectroscopy and UV/visible spectroscopy. The amount of E VA discoloration was found to be strongly depending on the additive formation. An important impact of the antioxidant in terms of chromophore formation inhibition could be found. Surprisingly, the highly stabilized E VA foils showed higher discoloration rates as well as a more intense fluorescence background in the Raman spectra.

Original languageAmerican English
Number of pages6
StatePublished - 2013
Event39th IEEE Photovoltaic Specialists Conference, PVSC 2013 - Tampa, FL, United States
Duration: 16 Jun 201321 Jun 2013


Conference39th IEEE Photovoltaic Specialists Conference, PVSC 2013
Country/TerritoryUnited States
CityTampa, FL

NREL Publication Number

  • NREL/CP-5200-61949


  • Antioxidants
  • Degradation
  • Discoloration
  • EVA
  • UV stabilizer


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