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Title: Plasma Surface Modification of Polymer Backsheets: Origins of Future Interfacial Barrier/Backsheet Failure (Poster)

Abstract

Flexible polymer substrates coated with inorganic oxide moisture barriers are a potential replacement for glass backsheets in thin-film PV (photovoltaic) modules. Silicon oxynitride (SiO{sub x}N{sub y}) deposited by plasma enhanced chemical vapor deposition (PECVD) on polyethylene terephthalate (PET) represents one potential new backsheet candidate. Barrier deposition runs at NREL have included a nitrogen-rich plasma pretreatment prior to barrier deposition with the intention of cleaning the PET surface and enhancing adhesion of the SiO{sub x}N{sub y} barrier film to PET; however, test coupons of PET/barrier/EVA/TPE failed after damp-heat exposure. (EVA is ethylene vinyl acetate and TPE is Tedlar{reg_sign}-PET-EVA). PET substrates exposed to plasma conditions similar to those used in pretreatment were examined by X-ray photoelectron spectroscopy (XPS) to reveal that new low molecular weight PET fragments were created at the PET surface. These fragments are responsible for barrier/PET interfacial failure and barrier transfer to the EVA encapsulant side following damp heat exposure.

Authors:
;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
893118
Report Number(s):
NREL/PO-520-39954
TRN: US200625%%97
DOE Contract Number:  
AC36-99-GO10337
Resource Type:
Conference
Resource Relation:
Conference: Prepared for the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion (WCPEC-4), 7-12 May 2006, Waikoloa, Hawaii
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; ADHESION; CHEMICAL VAPOR DEPOSITION; CLEANING; DEPOSITION; ENERGY CONVERSION; ETHYLENE; GLASS; MODIFICATIONS; MOISTURE; MOLECULAR WEIGHT; OXIDES; POLYETHYLENES; POLYMERS; POLYVINYLS; SILICON; SUBSTRATES; X-RAY PHOTOELECTRON SPECTROSCOPY; POLYMER SUBSTRATES; PLASMA; PET; INORGANIC OXIDE MOISTURE BARRIERS; GLASS BACKSHEETS; THIN-FILM; PV; PHOTOVOLTAIC; Solar Energy - Photovoltaics

Citation Formats

Pankow, J W, and Glick, S H. Plasma Surface Modification of Polymer Backsheets: Origins of Future Interfacial Barrier/Backsheet Failure (Poster). United States: N. p., 2006. Web. doi:10.1109/WCPEC.2006.279620.
Pankow, J W, & Glick, S H. Plasma Surface Modification of Polymer Backsheets: Origins of Future Interfacial Barrier/Backsheet Failure (Poster). United States. doi:10.1109/WCPEC.2006.279620.
Pankow, J W, and Glick, S H. Mon . "Plasma Surface Modification of Polymer Backsheets: Origins of Future Interfacial Barrier/Backsheet Failure (Poster)". United States. doi:10.1109/WCPEC.2006.279620. https://www.osti.gov/servlets/purl/893118.
@article{osti_893118,
title = {Plasma Surface Modification of Polymer Backsheets: Origins of Future Interfacial Barrier/Backsheet Failure (Poster)},
author = {Pankow, J W and Glick, S H},
abstractNote = {Flexible polymer substrates coated with inorganic oxide moisture barriers are a potential replacement for glass backsheets in thin-film PV (photovoltaic) modules. Silicon oxynitride (SiO{sub x}N{sub y}) deposited by plasma enhanced chemical vapor deposition (PECVD) on polyethylene terephthalate (PET) represents one potential new backsheet candidate. Barrier deposition runs at NREL have included a nitrogen-rich plasma pretreatment prior to barrier deposition with the intention of cleaning the PET surface and enhancing adhesion of the SiO{sub x}N{sub y} barrier film to PET; however, test coupons of PET/barrier/EVA/TPE failed after damp-heat exposure. (EVA is ethylene vinyl acetate and TPE is Tedlar{reg_sign}-PET-EVA). PET substrates exposed to plasma conditions similar to those used in pretreatment were examined by X-ray photoelectron spectroscopy (XPS) to reveal that new low molecular weight PET fragments were created at the PET surface. These fragments are responsible for barrier/PET interfacial failure and barrier transfer to the EVA encapsulant side following damp heat exposure.},
doi = {10.1109/WCPEC.2006.279620},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {5}
}

Conference:
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