TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The first polymer layer is treated on the side that bonds to the second polymer layer with a unit for treating the first polymer layer by which the surface energy of first polymer is raised to level effective for producing adhesion between the two polymer layers. The third polymer layer comprises polymer including ionomer resin of copolymer of ethylene and 3-8C alpha , beta -ethylenically unsaturated monocarboxylic acid (8-25 pts. wt.), or copolymer of ethylene and vinyl ester. The acid moieties ( greater than or equal to 35%) of resin are neutralized with metal ions. The first polymer layer comprises polyvinyl fluoride film, cast polyvinylidene fluoride film, or polyvinyl fluoride/polyester/polyvinyl fluoride laminate film. The second polymer layer comprises ionomer or metallocene catalyzed very low density polyethylene. The resin is a copolymer of ethylene and methacrylic acid (12-18%) or acrylic acid (10-15). The acid group (35-75%) is neutralized with metallic ion including zinc, lithium, sodium, magnesium, and/or calcium. The optional adhesive coating comprises thin acrylic adhesive layer between two polymer layers. The first and/or second polymer layer contains UV absorber, and/or UV stabilizer. The second polymer layer optionally contains pigment dye and/or flake. The first polymer layer comprises polvinylene fluoride film or polyvinyl fluoride film. The second polymer layer comprises (a) ionomer resin and pigment, dye, and/or flake; or (b) metallocene catalyzed very low density polyethylene; pigment, dye and/or flake; and adhesive layer containing acrylic polymer containing UV absorber, and/or UV stabilizer. Preferred Properties: The adhesive strength between the two polymer layers is optionally lower in multilayer sheet than it is in the module. The resin has melt index of 0.4-4. Preferred Methods: The sheet is treated by corona or flame treatment. The third or subsequent layers are applied by extrusion or film lamination to the second polymer layer. The third or subsequent layers encapsulate solar cells.