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  4. The influence of the additive composition on degradation induced changes in poly(ethylene-co-vinyl acetate) during photochemical aging
 
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2014
Conference Paper
Title

The influence of the additive composition on degradation induced changes in poly(ethylene-co-vinyl acetate) during photochemical aging

Abstract
Comprehensive knowledge about the influence of the additive composition on the degradation behavior of the most important photovoltaic (PV) module encapsulant, ethylene vinyl actetate (EVA), is crucial for enhancing its durability. To analyze this influence, EVA foils with different additive compositions were exposed to UV irradiation (135 W/m2) at 60 °C with a UV-A lamp, and characterized by spectroscopic methods (UV-vis, Raman spectroscopy) and DSC measurements. The reference foil with minimal additives showed significant changes in consistency during UV exposure. Those changes were explained by chain scissions, changes in conformation and crystallinity. In particular, degradation induced changes in the intensity of the symmetric compared to the asymmetric CH2 stretching vibrations, detected by Raman spectroscopy, indicate modifications in the conformational and crystalline setup. Therefore, their intensity ratio offers a nondestructive method to follow EVA degradation in PV modules. A major influence of additives on the development of fluorescent and chromophoric species was found. A quenching effect of oxygen on the development of fluorescent species was observed.
Author(s)
Beinert, Andreas  orcid-logo
Peike, C.
Dürr, Ines
Kempe, M.D.
Reiter, G.
Weiß, Karl-Anders  
Mainwork
29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2014  
Conference
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) 2014  
DOI
10.4229/EUPVSEC20142014-5BV.4.6
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Photovoltaische Module

  • Systeme und Zuverlässigkeit

  • Photovoltaische Module und Kraftwerke

  • Gebrauchsdauer von Modulen und Materialien

  • aging

  • encapsulation

  • additives

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