Abstract: A multilayer backsheet (1) for a photovoltaic module according to the invention comprises a first outside layer (2), a second outside layer (3) and at least one inside layer (4, 5) which is arranged between these outside layers (2, 3). This at least one inside layer (4, 5) forms a water-vapor barrier and/or oxygen barrier. All these layers (2, 3, 4, 5) are composed of polymers. The multilayer backsheet (1) for a photovoltaic module according to the invention is characterized in that at least one of the two outside layers (2, 3) comprises a polyamide, and that the at least one inside layer (4, 5) consists of polymers which are no fluoropolymers and do not comprise any polyethylene. Inside layers (4, 5) made of partly aromatic polyesters are used only in combination with at least one outside adhesion promoter layer (6) made of block copolyesteramide.

Abstract: Relates to mono-backsheets for photovoltaic modules. These mono-backsheets are produced or producible from a molding compound, this molding compound being based on at least one polyamide. The photovoltaic module mono-backsheet according to the invention is characterized in that the at least one polyamide is synthesized from linear and/or branched aliphatic and/or cycloaliphatic monomers, which have an average of at least 8 and at most 17 carbon atoms. The monomers are selected from the group which comprises diamines, dicarboxylic acids, lactams, and amino carboxylic acids, as well as mixtures thereof. The polyamides PA 610 and PA 612 are excluded from the present invention, and the polyamides based on lactams and amino carboxylic acids are cross-linked.