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Control of Moisture Ingress into Photovoltaic Modules

Description: During long-term exposure of photovoltaic modules to environmental stress, the ingress of water into the module is correlated with decreased performance. By using diffusivity measurements for water through encapsulants such as ethylene vinyl acetate (EVA), we have modeled moisture ingress using a finite-element analysis with atmospheric data from various locations such as Miami, Florida. This analysis shows that because of the high diffusivity of EVA, even an impermeable glass back-sheet alone … more
Date: February 1, 2005
Creator: Kempe, M. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Module Encapsulant Diagnostic and Modeling

Description: Encapsulant materials are used in photovoltaic devices for mechanical support, electrical isolation, and protection against corrosion. The ability of an encapsulant to protect against surface corrosion is related to its adhesional strength. The adhesion of candidate encapsulants under accelerated environmental stress was examined to determine what materials have the best hydrolytic stability and are more likely to reduce corrosion rates. Under environmental exposure, the ingress of water has be… more
Date: January 1, 2005
Creator: Kempe, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Testing of Packaging Materials for Improved PV Module Reliability

Description: A number of candidate alternative encapsulant and soft backsheet materials have been evaluated in terms of their suitability for photovoltaic (PV) module packaging applications. Relevant properties, including interfacial adhesion and moisture transport, have been measured as a function of damp-heat (85 C/85% relative humidity) exposure. Based on these tests, promising new encapsulants with improved properties have been identified. Backsheets prepared by industry and at NREL have been found to p… more
Date: February 1, 2005
Creator: Jorgensen, G. J.; Terwilliger, K. M.; Kempe, M. D. & McMahon, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Packaging Materials and Design for Improved PV Module Reliability

Description: A number of candidate alternative encapsulant and soft backsheet materials have been evaluated in terms of their suitability for photovoltaic (PV) module packaging applications. Relevant properties, including peel strength as a function of damp heat exposure and permeability, have been measured. Based on these tests, promising new encapsulants with adhesion-promoting primers have been identified that result in improved properties. Test results for backsheets provided by industry and prepared at… more
Date: January 1, 2005
Creator: Jorgensen, G.; Terwilliger, K.; Kempe, M.; Pern, J.; Glick, S.; del Cueto, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Materials Testing for PV Module Encapsulation

Description: Important physical properties of materials used in PV module packaging are presented. High-moisture-barrier, high-resistivity, adhesion-promoting coatings on polyethyl-ene terephthalate (PET) films have been fabricated and characterized for use in PV module application and com-pared to standard polymer backsheet materials. Ethylene vinyl acetate (EVA) and an encapsulant replacement for EVA are studied for their water vapor transmission rate (WVTR) and adhesion properties. WVTR, at test conditio… more
Date: May 1, 2003
Creator: Jorgensen, G.; Terwilliger, K.; Glick, S.; Pern, J. & McMahon, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New Barrier Coating Materials for PV Module Backsheets: Preprint

Description: This conference paper describes the high moisture barrier high resistivity coatings on polyethylene terepthalate (PET) have been fabricated and characterized for use in PV module back sheet applications. These thin film barriers exhibit water vapor transmission rates (WVTR) as low as 0.1 g/m2-day at 37.8 C and have shown excellent adhesion (> 10 N/mm) to both ethylene vinyl acetate (EVA) and PET even after filtered xenon arc lamp UV exposure. The WVTR and adhesion values for this constructio… more
Date: May 1, 2002
Creator: Barber, G. D.; Jorgensen, G. J.; Terwilliger, K.; Glick, S. H.; Pern, J. & McMahon, T. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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