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Title: Evaluation of Encapsulant Adhesion to Surface Metallization of Photovoltaic Cells: Preprint

Abstract

Delamination of encapsulant materials from PV cell surfaces often appears to originate at regions with metallization. Using a fracture mechanics based metrology, the adhesion of EVA encapsulant to screen printed silver metallization was evaluated. At room temperature, the fracture energy, Gc [J/m2], of the EVA/silver interface (952 J/m2) was ~70% lower than that of the EVA/AR coating (>2900 J/m2) and ~60% lower than that of the EVA to the surface of cell (2265 J/m2). After only 300 hours of damp heat aging, the adhesion energy of the silver interface dropped to and plateaued at ~50-60 J/m2, while that of the EVA/AR coating and EVA/cell remained mostly unchanged. Elemental surface analysis showed that the EVA separates from the silver in a purely adhesive manner, indicating that bonds at the interface were likely displaced in the presence of humidity and elevated temperature, and may explain the propensity for delamination to occur at metallized surfaces in the field.

Authors:
; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1364147
Report Number(s):
NREL/CP-5J00-68601
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at 2017 IEEE 44th Photovoltaic Specialists Conference (PVSC), 25-30 June 2017, Washington, DC
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; PV module reliability; encapsulant; EVA; adhesion; metallization

Citation Formats

Tracy, Jared, Dauskardt, Reinhold, and Bosco, Nick. Evaluation of Encapsulant Adhesion to Surface Metallization of Photovoltaic Cells: Preprint. United States: N. p., 2017. Web.
Tracy, Jared, Dauskardt, Reinhold, & Bosco, Nick. Evaluation of Encapsulant Adhesion to Surface Metallization of Photovoltaic Cells: Preprint. United States.
Tracy, Jared, Dauskardt, Reinhold, and Bosco, Nick. Wed . "Evaluation of Encapsulant Adhesion to Surface Metallization of Photovoltaic Cells: Preprint". United States. doi:. https://www.osti.gov/servlets/purl/1364147.
@article{osti_1364147,
title = {Evaluation of Encapsulant Adhesion to Surface Metallization of Photovoltaic Cells: Preprint},
author = {Tracy, Jared and Dauskardt, Reinhold and Bosco, Nick},
abstractNote = {Delamination of encapsulant materials from PV cell surfaces often appears to originate at regions with metallization. Using a fracture mechanics based metrology, the adhesion of EVA encapsulant to screen printed silver metallization was evaluated. At room temperature, the fracture energy, Gc [J/m2], of the EVA/silver interface (952 J/m2) was ~70% lower than that of the EVA/AR coating (>2900 J/m2) and ~60% lower than that of the EVA to the surface of cell (2265 J/m2). After only 300 hours of damp heat aging, the adhesion energy of the silver interface dropped to and plateaued at ~50-60 J/m2, while that of the EVA/AR coating and EVA/cell remained mostly unchanged. Elemental surface analysis showed that the EVA separates from the silver in a purely adhesive manner, indicating that bonds at the interface were likely displaced in the presence of humidity and elevated temperature, and may explain the propensity for delamination to occur at metallized surfaces in the field.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jun 14 00:00:00 EDT 2017},
month = {Wed Jun 14 00:00:00 EDT 2017}
}

Conference:
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