TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The backsheet is equipped with a protective layer on base of polypropylene (PP) resin, preferably being a co-extruded multi-layer with a rear layer facing the junction box on base of a flexible polypropylene (FPP) blend (preferably a UV and heat stabilized and opacified FPP reactor blend). The layers are attached together by a layer on base of a maleic anhydride (MAH) grafted polypropylene. The layer is based on a (co-)PE tie-layer resin. The layer is based on a MAH grafted polypropylene and further provided with a layer on base of a PP/PE interlocked blend having preferably a 2% secant E modulus (ASTM D882) lower than 250 (preferably lower than 100) MPa. The backsheet is further provided with a soft (co-)polyethylene(PE) layer having preferably a 2% secant E modulus (ASTM D882) lower than 250 (most preferably lower than 100) MPa. The backsheet is further provided with a layer on base of a (co-)PE tie layer resin. The reactive layer is based on (co-)polyamide, polyester resin, metallic films or metallized films or films provided with metal oxide layers. Preferred Module: In the PV module, an upper adhesive layer is based on ionomers or on PE tie-layers or on transparent (co-)polyethylene with external layers on base of PE tie-layers, where at least one PE tie-layer is based on (co-)PE grafted with maleic anhydride, preferably on (co-)PE grafted with maleic anhydride (less than 1 wt.%). A junction box is welded on the backsheet, preferably on a flexible polypropylene (FPP), based layer. A junction box is glued on at least locally plasma surface treated backsheet. The layer facing the cells and intermediate layer(s) provided between the layer facing the cells and the adhesive layer have adapted thicknesses, viscosity, melting behavior and softness providing controlled lateral flow, limited cell movement, adequate penetration between PV cells with good encapsulation properties and excellent adhesion to crystalline PV cells. The top layer is a glass plate equipped by CVD (pyrolitic decomposition) with a nano-layer of Al2O3, at the adhesive layer side. The module is equipped with an aluminum frame sealed to the backsheet by using an extruded, preferably soft rod with at least an external layer on base of functionalized PP, preferably functionalized FPP, e.g. grafted with maleic anhydride. EXAMPLE - No suitable example given.