NOVELTY - The thermoplastic double-layered film comprises two layers of which one forms an encapsulant (22) and the other forms a backsheet (26). An assembly of encapsulant and backsheet has a thickness of greater than 100 mu m. The encapsulant comprises a layer including: 0-100% of polyolefins containing polyethylene, which consists of ethylene homopolymer or copolymer including 50 mole% of ethylene and co-monomers; and polyamide-grafted polymer (5-50 mass%) including polyolefin backbone and a residue of unsaturated monomer and a polyamide graft.    USE - The thermoplastic double-layered film is useful in a photovoltaic module (claimed).    ADVANTAGE - The thermoplastic double-layered film enhances the lifespan and operational efficiency of the photovoltaic module.    DETAILED DESCRIPTION - The thermoplastic double-layered film comprises two layers of which one forms an encapsulant (22) and the other forms a backsheet (26). An assembly of encapsulant and backsheet has a thickness of greater than 100 mu m. The encapsulant comprises a layer including: 0-100% of polyolefins containing polyethylene, which consists of ethylene homopolymer or copolymer including 50 mole% of ethylene and co-monomers; and polyamide-grafted polymer (5-50 mass%) including polyolefin backbone and a residue of unsaturated monomer and a polyamide graft. The polyamide graft is attached with the polyolefin backbone by the residue of unsaturated monomer having a function to react by a reaction of condensation with the polyamide having a terminal amine and a terminal carboxylic acid. The residue of unsaturated monomer is fixed on the polymer backbone by grafting or copolymerization, where the number of monomer is less than or equal to 10. The polyamide-grafted polymer has a flow temperature (75-160 degrees C), which is defined as a glass transition temperature of the polyamide graft and the polyolefin backbone. The backsheet comprises a layer formed of polyamide-grafted polymer (5-50 mass%) including polyolefin backbone and the residue of unsaturated monomer and the polyamide graft. The grafted polymers of the encapsulant and the backsheet are nanostructured with each other. An average molecular mass of polyamide graft is 2000-3000 g.mol-1. The polyamide graft of the encapsulant comprises a copolyamide. The layer forming the encapsulant comprises adhesion promoter including non-polymeric ingredient, organic ingredient, crystalline or mineral ingredient, and semi-mineral or semi-organic ingredient. The backsheet consists of two layers, and the encapsulant consists of a single layer. An INDEPENDENT CLAIM is included for a photovoltaic module.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a photovoltaic module.    Photovoltaic stack (10)    Photovoltaic module (20)    Encapsulant (22)    Upper protective layer (24)    Backsheet. (26)