NOVELTY - The method comprises contacting a surface of a second film layer with a modified surface of a first film layer, and adhering the first film layer to the second film layer by the application of heat and optionally pressure or vacuum to form a multilayer film laminate that comprises the first and second film layers. The surface of the first film layer is modified by a surface treatment. The first film layer comprises a perfluorinated copolymer resin composition that consists of copolymerized units of tetrafluoroethylene and a perfluorinated comonomer.    USE - The method is useful for preparing a transparent multilayer film laminate, which is useful for preparing a photovoltaic module (claimed) and as a integrated frontsheet in the photovoltaic module.    ADVANTAGE - The method is capable of effectively preparing the transparent multilayer film laminate with improved strength, excellent weather resistance and UV resistance, increased moisture barrier properties, low dielectric constant, and high breakdown voltage and light transmission characteristics thus improving the efficiency, overall performance of the flexible solar module and protecting the electrical components of the photovoltaic module.    DETAILED DESCRIPTION - The method comprises contacting a surface of a second film layer with a modified surface of a first film layer, and adhering the first film layer to the second film layer by the application of heat and optionally pressure or vacuum to form a multilayer film laminate that comprises the first and second film layers. The surface of the first film layer is modified by a surface treatment. The first film layer comprises a perfluorinated copolymer resin composition that consists of copolymerized units of tetrafluoroethylene and a perfluorinated comonomer. The second film layer comprises a polymeric material comprising a blend of an organosilane such as aminosilane and a copolymer comprising copolymerized units of an alpha -olefin and an ethylenically unsaturated carboxylic acid ester. The ester copolymer comprises copolymerized units of an butyl acrylate. The multilayer film laminate has an average peel strength between the first film layer and the second film layer of greater than 2 lbf/in measured after exposing the multilayer film laminate to conditions of 85 degrees C and 85% relative humidity for 1000 hours. The multilayer film laminate and a comparison standard laminate have the same structure and composition with the exception that the first film layer of the comparison standard laminate comprises an ethylene tetrafluoroethylene copolymer resin. The compositions of the first film layers of the multilayer film laminate and the comparison standard laminate are otherwise identical. The modified surface of the first film layer is treated with an aminosilane before contacting the surface of the second film layer. An INDEPENDENT CLAIM is included for a method for preparing a photovoltaic module.