Photovoltaic module comprising plasticized intermediate layer films having high radiation transmission
AssigneeKuraray Europe GmbH
InventorUwe Keller
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Abstract
The invention relates to the use of plasticiser-containing, polyvinyl acetal-based films that have a UV transmission of more than 35% to manufacture photovoltaic modules. The films preferably have a volume resistivity of more than 1E11 Ohm*cm in an ambient climate of 85% rH/23° C. The photovoltaic modules can be used as façade elements, roof surfaces, conservatory panelling, acoustic barriers, balcony or curtain wall panels, or as elements in glazed surfaces.
Claims9
A photovoltaic module, comprising a laminate made from
- a) a transparent front cover
- b) one or more photosensitive semiconductor layers
- c) at least one plasticiser-containing, polyvinyl acetal-based film, and
- d) a rear cover, characterized in that
- the plasticiser-containing, polyvinyl acetal-based film c) has a UV transmission at 280 to 380 nm greater than 35%, determined between two panels of white glass, each 2 mm thick in accordance with EN410.
Plasticiser-containing, polyvinyl acetal-based film, characterized in that it contains relative to the film mixture in each case aromatic UV absorbers with a concentration less than 0.01% by weight and 0.005 to 1% by weight sterically hindered amines (HALS) and/or sterically hindered aminoethers (NOR-HALS) as the non-aromatic photoprotection agents.
Plasticiser-containing, polyvinyl acetal-based film, characterized in that the polyvinyl acetal is produced by acid-catalysed acetalisation of polyvinyl alcohol, wherein the polyvinyl alcohol has extinction values of less than 0.5 in a 4% by weight aqueous solution having a layer thickness of 1 cm.
Dependencies are inferred from the claim text.