Towards the Origin of Photochemical EVA Discoloration

Cornelia Peike; Lea Purschke; Karl Anders Weiss; Michael Kohl; Michael Kempe

doi:10.1109/PVSC.2013.6744447

Towards the Origin of Photochemical EVA Discoloration

Cornelia Peike, Lea Purschke, Karl Anders Weiss, Michael Kohl, Michael Kempe

Materials Science

Fraunhofer Institute for Solar Energy Systems

Research output: Contribution to conference › Paper › peer-review

37 Scopus Citations

Abstract

The root cause of the photochemical ethylene vinyl acetate (EVA) discoloration in photovoltaic (PV) modules was investigated. Laminates containing EVA foils with a systematic variation of the additive formulation, i.e. the crosslinking agents, ultraviolet (UV) absorber, hindered amine light stabilizers and antioxidants, were subjected to UV aging. The influence of the additive combination on the photochemical aging of E VA was investigated by Raman spectroscopy, Fourier transform infrared spectroscopy and UV/visible spectroscopy. The amount of E VA discoloration was found to be strongly depending on the additive formation. An important impact of the antioxidant in terms of chromophore formation inhibition could be found. Surprisingly, the highly stabilized E VA foils showed higher discoloration rates as well as a more intense fluorescence background in the Raman spectra.

Original language	American English
Pages	1579-1584
Number of pages	6
DOIs	https://doi.org/10.1109/PVSC.2013.6744447 https://doi.org/10.1109/PVSC.2013.6744447
State	Published - 2013
Event	39th IEEE Photovoltaic Specialists Conference, PVSC 2013 - Tampa, FL, United States Duration: 16 Jun 2013 → 21 Jun 2013

Conference

Conference	39th IEEE Photovoltaic Specialists Conference, PVSC 2013
Country/Territory	United States
City	Tampa, FL
Period	16/06/13 → 21/06/13

NREL Publication Number

NREL/CP-5200-61949

Keywords

Antioxidants
Degradation
Discoloration
EVA
UV stabilizer

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Towards the Origin of Photochemical EVA Discoloration",

abstract = "The root cause of the photochemical ethylene vinyl acetate (EVA) discoloration in photovoltaic (PV) modules was investigated. Laminates containing EVA foils with a systematic variation of the additive formulation, i.e. the crosslinking agents, ultraviolet (UV) absorber, hindered amine light stabilizers and antioxidants, were subjected to UV aging. The influence of the additive combination on the photochemical aging of E VA was investigated by Raman spectroscopy, Fourier transform infrared spectroscopy and UV/visible spectroscopy. The amount of E VA discoloration was found to be strongly depending on the additive formation. An important impact of the antioxidant in terms of chromophore formation inhibition could be found. Surprisingly, the highly stabilized E VA foils showed higher discoloration rates as well as a more intense fluorescence background in the Raman spectra.",

keywords = "Antioxidants, Degradation, Discoloration, EVA, UV stabilizer",

author = "Cornelia Peike and Lea Purschke and Weiss, {Karl Anders} and Michael Kohl and Michael Kempe",

year = "2013",

doi = "10.1109/PVSC.2013.6744447",

language = "American English",

pages = "1579--1584",

note = "39th IEEE Photovoltaic Specialists Conference, PVSC 2013 ; Conference date: 16-06-2013 Through 21-06-2013",

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TY - CONF

T1 - Towards the Origin of Photochemical EVA Discoloration

AU - Peike, Cornelia

AU - Purschke, Lea

AU - Weiss, Karl Anders

AU - Kohl, Michael

AU - Kempe, Michael

PY - 2013

Y1 - 2013

N2 - The root cause of the photochemical ethylene vinyl acetate (EVA) discoloration in photovoltaic (PV) modules was investigated. Laminates containing EVA foils with a systematic variation of the additive formulation, i.e. the crosslinking agents, ultraviolet (UV) absorber, hindered amine light stabilizers and antioxidants, were subjected to UV aging. The influence of the additive combination on the photochemical aging of E VA was investigated by Raman spectroscopy, Fourier transform infrared spectroscopy and UV/visible spectroscopy. The amount of E VA discoloration was found to be strongly depending on the additive formation. An important impact of the antioxidant in terms of chromophore formation inhibition could be found. Surprisingly, the highly stabilized E VA foils showed higher discoloration rates as well as a more intense fluorescence background in the Raman spectra.

AB - The root cause of the photochemical ethylene vinyl acetate (EVA) discoloration in photovoltaic (PV) modules was investigated. Laminates containing EVA foils with a systematic variation of the additive formulation, i.e. the crosslinking agents, ultraviolet (UV) absorber, hindered amine light stabilizers and antioxidants, were subjected to UV aging. The influence of the additive combination on the photochemical aging of E VA was investigated by Raman spectroscopy, Fourier transform infrared spectroscopy and UV/visible spectroscopy. The amount of E VA discoloration was found to be strongly depending on the additive formation. An important impact of the antioxidant in terms of chromophore formation inhibition could be found. Surprisingly, the highly stabilized E VA foils showed higher discoloration rates as well as a more intense fluorescence background in the Raman spectra.

KW - Antioxidants

KW - Degradation

KW - Discoloration

KW - EVA

KW - UV stabilizer

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U2 - 10.1109/PVSC.2013.6744447

DO - 10.1109/PVSC.2013.6744447

M3 - Paper

AN - SCOPUS:84896465475

SP - 1579

EP - 1584

T2 - 39th IEEE Photovoltaic Specialists Conference, PVSC 2013

Y2 - 16 June 2013 through 21 June 2013

ER -

Towards the Origin of Photochemical EVA Discoloration

Abstract

Conference

NREL Publication Number

Keywords

UN SDGs

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