Weathering Degradation of EVA Encapsulant and the Effect of Its Yellowing on Solar Cell Efficiency

F. J. Pern, A. W. Czanderna, K. A. Emery, R. G. Dhere

Research output: Contribution to conferencePaperpeer-review

53 Scopus Citations

Abstract

After five or more years of weathering, the degradation of ethylene-vinyl acetate (EVA) encapsulant in photovoltaic (PV) modules resulted in a yellow to dark brown color. Degraded EVA shows a substantial increase in the gel content and a large to complete loss of the ultraviolet (UV) absorber, Cyasorb UV 531. The EVA discoloration is caused by the formation of polyconjugated (C=C)n double bonds of various lengths. Acetic acid and other volatile organic components are also produced from the photothermal decomposition of the EVA. The solar cell efficiency was reduced by approximately 9% by a light-yellow-brown EVA and approximately 50% by a dark-brown EVA. Weathered PV modules with dark-brown EVA also show a approximately 50% decrease in efficiency.

Original languageAmerican English
Pages557-561
Number of pages5
StatePublished - 1992
Externally publishedYes
EventTwenty-second IEEE Photovoltaic Specialist Conference - 1991 - Las Vegas, Nevada
Duration: 7 Oct 199111 Oct 1991

Conference

ConferenceTwenty-second IEEE Photovoltaic Specialist Conference - 1991
CityLas Vegas, Nevada
Period7/10/9111/10/91

NREL Publication Number

  • NREL/CP-214-4543

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