Tearing and reliability of photovoltaic module backsheets

Yuen, Pak Yan; Moffitt, Stephanie L.; Novoa, Fernando D.; Schelhas, Laura T.; Dauskardt, Reinhold H.

doi:10.1002/pip.3144

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Title: Tearing and reliability of photovoltaic module backsheets

Journal Article · 28 May 2019 · Progress in Photovoltaics

DOI: https://doi.org/10.1002/pip.3144 · OSTI ID:1560684

Yuen, Pak Yan ^[1];

^[2]; Novoa, Fernando D. ^[3];

^[2];

^[1]

Stanford Univ., CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
SolarCity, Fremont, CA (United States)

We report that the backsheet in photovoltaic modules belongs to an important class of layered materials where the tearing behavior of the individual layers does not necessarily represent the tearing behavior of the entire backsheet. Such characteristic arises from the interaction between the individual layers during the tearing process, where one layer of the backsheet is mechanically constrained by its neighboring layers and the layers may debond from each other. The mechanical constraint and debonding change the amount of energy dissipated during tearing and affect the overall tearing energy. In this article, we exposed a wide selection of backsheets with polymers including ethylene-vinyl acetate (EVA), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), and ethylene tetrafluoroethylene (ETFE) to damp heat (85°C/85%RH) for up to 2000 hours. We report on the effect of damp heat on the tearing energy as a function of damp heat exposure. We developed a model that describes the tearing energy of a layered structure by accounting for the tearing of the individual layers in the backsheet, the effect of mechanical constraint, and the adhesive debonding between the layers. Additionally, we explore the relationship between the microstructural change in the polymers which resulted from the damp heat exposure and the mechanical properties using modulated differential scanning calorimetry (MDSC), small and wide angle X-ray scattering (SAXS and WAXS), and tensile testing.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1560684

Journal Information:: Progress in Photovoltaics, Journal Name: Progress in Photovoltaics Journal Issue: 8 Vol. 27; ISSN 1062-7995

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

References (27)

Introduction to Physical Polymer Science Sperling, L. H. John Wiley & Sons, Inc. https://doi.org/10.1002/0471757128	book	January 2005
Recrystallization of polyethylene during annealing Statton, W. O.; Geil, P. H. Journal of Applied Polymer Science, Vol. 3, Issue 9 https://doi.org/10.1002/app.1960.070030913	journal	May 1960
Thermal properties of proton-conducting radiation-grafted membranes Gürsel, Selmiye Alkan; Schneider, Julian; Ben Youcef, Hicham Journal of Applied Polymer Science, Vol. 108, Issue 6 https://doi.org/10.1002/app.27947	journal	January 2008
Degradation of photovoltaic backsheets: Comparison of the aging induced changes on module and component level Knausz, Marlene; Oreski, Gernot; Eder, Gabriele C. Journal of Applied Polymer Science, Vol. 132, Issue 24 https://doi.org/10.1002/app.42093	journal	March 2015
Effect of Mechanical Constraint on Tearing Energy of Polymer Membranes Yuen, Pak Yan; Dauskardt, Reinhold H. Macromolecular Materials and Engineering, Vol. 301, Issue 9 https://doi.org/10.1002/mame.201600132	journal	June 2016
Correlation of the loss in photovoltaic module performance with the ageing behaviour of the backsheets used: Influence of backsheet on photovoltaic module performance Voronko, Yuliya; Eder, Gabriele C.; Knausz, Marlene Progress in Photovoltaics: Research and Applications, Vol. 23, Issue 11 https://doi.org/10.1002/pip.2580	journal	January 2015
Morphology of n-alkanes, linear polyethylene, and isotactic polypropylene crystallized from solution Rånby, B. G.; Morehead, F. F.; Walter, N. M. Journal of Polymer Science, Vol. 44, Issue 144 https://doi.org/10.1002/pol.1960.1204414407	journal	June 1960
Crystalline character in polymers Peterlin, A. Journal of Polymer Science Part C: Polymer Symposia, Vol. 9, Issue 1 https://doi.org/10.1002/polc.5070090106	journal	January 1965
Physical ageing studies in semicrystalline poly(ethylene terephthalate) Montserrat, S.; Cortés, P. Journal of Materials Science, Vol. 30, Issue 7 https://doi.org/10.1007/BF00351611	journal	April 1995
Study of the morphology of semicrystalline poly(ethylene terephthalate) by hydrolysis etching Cagiao, M. E.; Calleja, F. J. Baltá; Vanderdonckt, C. Polymer, Vol. 34, Issue 10 https://doi.org/10.1016/0032-3861(93)90726-Q	journal	January 1993
Introduction to physical polymer science Brooks, B. W. The Chemical Engineering Journal, Vol. 38, Issue 1 https://doi.org/10.1016/0300-9467(88)80057-1	journal	May 1988
Glass transition and structural relaxation in semi-crystalline poly(ethylene terephthalate): a DSC study Alves, N. M.; Mano, J. F.; Balaguer, E. Polymer, Vol. 43, Issue 15 https://doi.org/10.1016/S0032-3861(02)00236-7	journal	July 2002
A study of enthalpic relaxation of poly(ethylene terephthalate) by conventional and modulated temperature DSC Bailey, Nicola A.; Hay, James N.; Price, Duncan M. Thermochimica Acta, Vol. 367-368 https://doi.org/10.1016/S0040-6031(00)00685-7	journal	March 2001
Failure Modes Evaluation of PV Module via Materials Degradation Approach Wang, Ethan; Yang, Hsinjin Edwin; Yen, Jerry Energy Procedia, Vol. 33 https://doi.org/10.1016/j.egypro.2013.05.066	journal	January 2013
The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET) Badia, J. D.; Strömberg, E.; Karlsson, S. Polymer Degradation and Stability, Vol. 97, Issue 1 https://doi.org/10.1016/j.polymdegradstab.2011.10.008	journal	January 2012
Structural evolution of PVDF during storage or annealing Neidhöfer, M.; Beaume, F.; Ibos, L. Polymer, Vol. 45, Issue 5 https://doi.org/10.1016/j.polymer.2003.12.066	journal	March 2004
Influence of alternating sequential fraction on the melting and glass transition temperatures of ethylene–tetrafluoroethylene copolymer Arai, Kiyotaka; Funaki, Atsushi; Phongtamrug, Suttinun Polymer, Vol. 51, Issue 21 https://doi.org/10.1016/j.polymer.2010.08.009	journal	October 2010
Performance and degradation analysis for long term reliability of solar photovoltaic systems: A review Sharma, Vikrant; Chandel, S. S. Renewable and Sustainable Energy Reviews, Vol. 27 https://doi.org/10.1016/j.rser.2013.07.046	journal	November 2013
Aging mechanisms of polymeric films for PV encapsulation Oreski, G.; Wallner, G. M. Solar Energy, Vol. 79, Issue 6 https://doi.org/10.1016/j.solener.2005.02.008	journal	December 2005
Environmental mechanisms of debonding in photovoltaic backsheets Novoa, Fernando D.; Miller, David C.; Dauskardt, Reinhold H. Solar Energy Materials and Solar Cells, Vol. 120 https://doi.org/10.1016/j.solmat.2013.08.020	journal	January 2014
Study on the degradation of different types of backsheets used in PV module under accelerated conditions Kim, Namsu; Kang, Hyunwoo; Hwang, Kyung-Jun Solar Energy Materials and Solar Cells, Vol. 120 https://doi.org/10.1016/j.solmat.2013.09.036	journal	January 2014
Structure and basic properties of photovoltaic module backsheet films Geretschläger, Klaus J.; Wallner, Gernot M.; Fischer, Jörg Solar Energy Materials and Solar Cells, Vol. 144 https://doi.org/10.1016/j.solmat.2015.09.060	journal	January 2016
Study of single crystals and their associations in polymers Keller, A.; O'Connor, A. Discussions of the Faraday Society, Vol. 25 https://doi.org/10.1039/df9582500114	journal	January 1958
Nika : software for two-dimensional data reduction Ilavsky, Jan Journal of Applied Crystallography, Vol. 45, Issue 2 https://doi.org/10.1107/S0021889812004037	journal	March 2012
GSAS-II : the genesis of a modern open-source all purpose crystallography software package Toby, Brian H.; Von Dreele, Robert B. Journal of Applied Crystallography, Vol. 46, Issue 2 https://doi.org/10.1107/S0021889813003531	journal	March 2013
A Comparison of Key PV Backsheet and Module Performance from Fielded Module Exposures and Accelerated Tests Gambogi, W.; Heta, Y.; Hashimoto, K. IEEE Journal of Photovoltaics, Vol. 4, Issue 3 https://doi.org/10.1109/JPHOTOV.2014.2305472	journal	May 2014
Long-term performance and reliability assessment of 8 PV arrays at Sandia National Laboratories Granata, J. E.; Boyson, W. E.; Kratochvil, J. A. 2009 34th IEEE Photovoltaic Specialists Conference (PVSC) https://doi.org/10.1109/PVSC.2009.5411336	conference	June 2009

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Related Subjects

36 MATERIALS SCIENCE
MDSC
backsheet
damp heat
polymer
reliability
small and wide angle X‐ray scattering
tearing
tensile testing

Title: Tearing and reliability of photovoltaic module backsheets

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