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Calcium based test method for evaluation of photovoltaic edge-seal materials

Author: Michael D KempeArrelaine DameronMatthew ReeseNational Renewable Energy Laboratory (U.S.)United States. Department of Energy.All authors
Publisher: [Golden, Colo.] : National Renewable Energy Laboratory, [2011]
Series: NREL/PR, 5200-50839.
Edition/Format:   eBook : Document : National government publication : English
Database:WorldCat
Summary:
Because of the sensitivity of some photovoltaic devices to moisture-induced corrosion, they are packaged using impermeable front- and back-sheets with an edge seal to prevent moisture ingress. Evaluation of edge seal materials can be difficult because of the low permeation rates involved and/or non-Fickian behavior. Here, using a Ca film deposited on a glass substrate, we demonstrate the evaluation of edge seal  Read more...
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Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Michael D Kempe; Arrelaine Dameron; Matthew Reese; National Renewable Energy Laboratory (U.S.); United States. Department of Energy.; United States. Department of Energy. Office of Scientific and Technical Information.
OCLC Number: 727186022
Notes: Title from title screen (viewed on June 8, 2011).
"2011 NREL PV Module Reliability Workshop, February 16, 2011."
Published through the Information Bridge: DOE Scientific and Technical Information.
Kempe, M.; Dameron, A.; Reese, M.
Description: 1 online resource (21 slides) : col. ill.
Series Title: NREL/PR, 5200-50839.
Responsibility: Michael Kempe, Arrelaine Dameron, Matthew Reese.

Abstract:

Because of the sensitivity of some photovoltaic devices to moisture-induced corrosion, they are packaged using impermeable front- and back-sheets with an edge seal to prevent moisture ingress. Evaluation of edge seal materials can be difficult because of the low permeation rates involved and/or non-Fickian behavior. Here, using a Ca film deposited on a glass substrate, we demonstrate the evaluation of edge seal materials in a manner that effectively duplicates their use in a photovoltaic application and compare the results with standard methods for measuring water vapor transport. We demonstrate how moisture permeation data from polymer films can be used to estimate moisture ingress rates and compare the results of these two methods. Encapsulant materials were also evaluated for comparison and to highlight the need for edge seals. Of the materials studied, dessicant-filled polyisobutene materials demonstrate by far the best potential to keep moisture out for a 20 to 30 year lifetime.

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