Accelerated Exposure Tests of Encapsulated Si Solar Cells and Encapsulation Materials

    Research output: Contribution to conferencePaper


    We have conducted a series of accelerated exposure test (AET) studies for various crystalline-Si (c-Si) and amorphous-Si (a-Si) cell samples that were encapsulated with different superstrates, pottants, and substrates. Nonuniform browning patterns of ethylene vinyl acetate (EVA) pottants were observed for glass/EVA/glass-encapsulated c-Si cell samples under solar simulator exposures at elevatedtemperatures. The polymer/polymer-configured laminates with Tedlar or Tefzel did not discolor because of photobleaching reactions, but yellowed with polyester or nylon top films. Delamination was observed for the polyester/EVA layers on a-Si minimodules and for a polyolefin-based thermoplastic pottant at high temperatures. For all tested c-Si cell samples, irregular changes in thecurrent-voltage parameters were observed that could not be accounted for simply by the transmittance changes of the superstrate/pottant layers. Silicone-type adhesives used under UV-transmitting polymer top films were observed to cause greater cell current/efficiency loss than EVA or polyethylene pottants.
    Original languageAmerican English
    Number of pages8
    StatePublished - 1998
    EventNational Center for Photovolatics Program Review Meeting - Denver, Colorado
    Duration: 8 Sep 199811 Sep 1998


    ConferenceNational Center for Photovolatics Program Review Meeting
    CityDenver, Colorado

    NREL Publication Number

    • NREL/CP-520-25361


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