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The effect of damp-heat and UV aging tests on the optical properties of silicone and EVA encapsulants
Progress in photovoltaics, 2011-05, Vol.19 (3), p.294-300
McIntosh, Keith R.
Powell, Nick E.
Norris, Ann W.
Cotsell, James N.
Ketola, Barry M.
2011
Details
Autor(en) / Beteiligte
McIntosh, Keith R.
Powell, Nick E.
Norris, Ann W.
Cotsell, James N.
Ketola, Barry M.
Titel
The effect of damp-heat and UV aging tests on the optical properties of silicone and EVA encapsulants
Ist Teil von
Progress in photovoltaics, 2011-05, Vol.19 (3), p.294-300
Ort / Verlag
Chichester, UK: John Wiley & Sons, Ltd
Erscheinungsjahr
2011
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The absorption coefficient α(λ) of polydimethylsiloxane (PDMS) silicone and ethylene vinyl acetate (EVA) is monitored during exposure to damp‐heat (DH) and UV accelerated aging tests. In the DH test, the samples were exposed to 85% relative humidity at 85°C for 1325 h, satisfying the DH components of the IEC, UL, and IEEE's humidity‐freeze and DH tests. It is shown that moisture introduced by the DH exposure scatters incident light, reducing transmission through test samples and complicating optical experiments. It was therefore necessary to dry out the samples to assess the effect of DH exposure on α(λ). By this procedure, it was found that DH exposure caused an increase of α(λ) in both PDMS and EVA, where small absorption shoulders were introduced at wavelengths of 250–500 nm; this translates to a 0.14% and 0.39% loss in module efficiency for the silicone and EVA, respectively. The weight gain due to moisture was 0.035% for PDMS and 0.28% for EVA. In the UV test, the samples were held at 60 ± 5°C and exposed to 52 kWh/m2 between the wavelengths of 280 and 385 nm, and 5.0 kWh/m2 between 280 and 320 nm, satisfying the pre‐conditioning UV tests of the IEC reliability standard. The UV exposure did not affect α(λ) of either the PDMS or the EVA. Copyright © 2010 John Wiley & Sons, Ltd. The absorption coefficient of polydimethylsiloxane (PDMS) silicone and ethylene vinyl acetate (EVA) is monitored during exposure to damp‐heat (DH) and UV accelerated aging tests. It is found that moisture introduced by DH exposure scatters incident light, reducing transmission through test samples and complicating optical experiments. It is also found that the absorption coefficient of both PDMS and EVA degrades slightly under DH but is stable under UV.
Sprache
Englisch
Identifikatoren
ISSN: 1062-7995, 1099-159X
eISSN: 1099-159X
DOI: 10.1002/pip.1025
Titel-ID: cdi_proquest_miscellaneous_901667054
Format
–
Schlagworte
Applied sciences
,
damp-heat
,
Direct energy conversion and energy accumulation
,
Electrical engineering. Electrical power engineering
,
Electrical power engineering
,
encapsulation
,
Energy
,
EVA
,
Exact sciences and technology
,
module
,
Natural energy
,
Photoelectric conversion
,
Photovoltaic conversion
,
silicone
,
Solar cells. Photoelectrochemical cells
,
Solar energy
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