TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The synthetic polymer is a linear or crosslinked polyolefin homopolymer, a cyclic olefin homopolymer, a cyclic olefin copolymer, a linear or crosslinked polyolefin copolymer, a poly(vinyl butyral), a crosslinked ethylene vinyl acetate copolymer, a polyester, a polycarbonate, a polyurethane, a fluorinated polymer, a poly(methyl methacrylate) and a polysiloxane. The layer or layers of component are a front support layer, an encapsulating layer or a back substrate layer. The encapsulating layer contains a synthetic polymer including a linear or crosslinked polyolefin homopolymer, a linear or crosslinked polyolefin copolymer, a cyclic olefin homopolymer, a cyclic olefin copolymer, a poly(vinyl butyral), a crosslinked ethylene vinyl acetate copolymer, a polyurethane or a polysiloxane. The back substrate layer contains a synthetic polymer including a polyester, a polyamide or a fluorinated polymer. The photovoltaic semiconductor contains a crystalline silicon or an amorphous silicon. (B1) is 2-(4,6-bis-biphenyl-4-yl-(1,3,5)triazin-2-yl)-5-(2-ethyl-hexyloxy)-phenol (B1a), 2-(4-(4,6-bis-biphenyl-4-yl-(1,3,5)triazin-2-yl)-3-hydroxy-phenoxy)-propionic acid octyl ester (B1b), 2-(4-hexyloxy-phenyl)-4,6-diphenyl-(1,3,5)triazine (B1c), 2-(4,6-bis-(2,4-dimethyl-phenyl)-(1,3,5)triazin-2-yl)-5-octyloxy-phenol (B1d), 3-(4-(4,6-bis-(2,4-dimethyl-phenyl)-(1,3,5)triazin-2-yl)-3-hydroxy-phenoxy)-propane-1,2-diol compound of formula (B1e) and 2-(4,6-bis-(2,4-dimethyl-phenyl)-(1,3,5)triazin-2-yl)-5-(3-(2-ethyl-hexyloxy)-2-hydroxy-propoxy)-phenol. (B2) is 2-(4,6-bis-(4-(2-ethyl-hexyloxy)-phenyl)-(1,3,5)triazin-2-yl)-5-methoxy-phenol (B2a), 2-(4,6-bis-(4-butoxy-phenyl)-(1,3,5)triazin-2-yl)-5-butoxy-phenol (B2b), and 2-(4-(4,6-bis-(2-hydroxy-4-(1-octyloxycarbonyl-ethoxy)-phenyl)-(1,3,5)triazin-2-yl)-3-hydroxy-phenoxy)-propionic acid octyl ester (B2c). The component (B) is a mixture of the compounds (B1a) and (B2a), a mixture of the compounds (B1a) and (B2b) or a mixture of the compounds (B1c) and (B2c). (C) is tetramethylpiperidine derivatives of formulae (C1a)-(C1d), and (C2a)-(C4a). The layer or layers of component contain the components (A), (B) and (C). The layer or layers of component contains one or more further components including (D) a benzotriazole UV absorber, (E) a phenolic antioxidant, (F) a basic co-stabilizer and (G) a neutralizer. The component (A) is a crosslinked ethylene vinyl acetate copolymer and component (B) is a mixture containing a compound (B1a) and a compound (B2a). The photovoltaic module comprises a photovoltaic semiconductor and one or more layers containing a crosslinked ethylene vinyl acetate copolymer and a compound (B1a).b1, b2 = 2-20;R1 = H, 1-8C alkyl, O, -OH, -CH2CN, 3-8C alkenyl, 7-9C phenylalkyl optionally substituted on the phenyl by 1-3 groups of 1-4C alkyl, or 1-8C acyl; andR2, R3 = R1.