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Open AccessArticle

Effect of Backsheet Properties on PV Encapsulant Degradation during Combined Accelerated Aging Tests

1
Fraunhofer Institute for Solar Energy Systems ISE, 79110 Freiburg im Breisgau, Germany
2
EPFL VPRHO DSPS COSEC-ENAC, CH-1015 Lausanne, Switzerland
3
Polymer Competence Center Leoben GmbH, AT-8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(12), 5208; https://doi.org/10.3390/su12125208
Received: 3 June 2020 / Revised: 18 June 2020 / Accepted: 24 June 2020 / Published: 26 June 2020
(This article belongs to the Special Issue Photovoltaic Life Time Forecast and Evaluation)
Long-term photovoltaic (PV) module reliability is highly determined by the durability of the polymeric components (backsheet and encapsulation materials). This paper presents the result of experiments on encapsulant degradation influenced by the backsheet permeation properties. Towards this goal, one type of ethylene/vinyl acetate copolymer (EVA) was aged in glass/EVA/backsheet laminates in accelerated aging tests (up to 4000 h for Damp-Heat (DH) and up to 480 kWh/m2 for UV and UV-DH combined). The samples contained three backsheets with different permeation properties to examine their impact on EVA degradation. Thermal and chemical characterization shows that the EVA degradation is stronger with the glass–EVA–polyamide (PA)-based backsheet than with the polyethylene terephthalate (PET)-based backsheets. The higher oxygen transmission rate (OTR) of the PA-based backsheet may increase photo-oxidation and aggravating the degradation of EVA in the laminates. Furthermore, FTIR results were used to demonstrate the effect of damp heat exposure on the EVA interfaces, showing an accelerated degradation at the glass–EVA interface. The comparison of accelerated aging stress factors reveals that EVA suffers the strongest chemical and optical degradation when high UV, high temperature and high relative humidity are combined simultaneously. View Full-Text
Keywords: encapsulant; backsheet; degradation; accelerated aging; damp-heat; ultraviolet (UV), UV-DH combined; material combination; photovoltaic (PV) module encapsulant; backsheet; degradation; accelerated aging; damp-heat; ultraviolet (UV), UV-DH combined; material combination; photovoltaic (PV) module
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MDPI and ACS Style

Mansour, D.E.; Barretta, C.; Pitta Bauermann, L.; Oreski, G.; Schueler, A.; Philipp, D.; Gebhardt, P. Effect of Backsheet Properties on PV Encapsulant Degradation during Combined Accelerated Aging Tests. Sustainability 2020, 12, 5208. https://doi.org/10.3390/su12125208

AMA Style

Mansour DE, Barretta C, Pitta Bauermann L, Oreski G, Schueler A, Philipp D, Gebhardt P. Effect of Backsheet Properties on PV Encapsulant Degradation during Combined Accelerated Aging Tests. Sustainability. 2020; 12(12):5208. https://doi.org/10.3390/su12125208

Chicago/Turabian Style

Mansour, Djamel E.; Barretta, Chiara; Pitta Bauermann, Luciana; Oreski, Gernot; Schueler, Andreas; Philipp, Daniel; Gebhardt, Paul. 2020. "Effect of Backsheet Properties on PV Encapsulant Degradation during Combined Accelerated Aging Tests" Sustainability 12, no. 12: 5208. https://doi.org/10.3390/su12125208

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