The invention relates to a film comprising a functionalized polyolefin polymer and to the use of the film as an encapsulant film for a photovoltaic module. The functionalized polyolefin polymer is a polymer selected from: (a) a propylene copolymer, (b) a propylene terpolymer, (c) an ethylene terpolymer, and (d) a polymer mixture comprising any combination of polymers (a) to (c). Further, the functionalized polyolefin polymer comprises <0.8 wt %, of an inorganic metal oxide such as alumina, based on the total weight of the functionalized polyolefin polymer. The invention further relates to an encapsulated solar cell comprising encapsulant layers comprising the film. The invention further relates to a photovoltaic module comprising the encapsulated solar cell and to a process for making the photovoltaic module.