TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The photovoltaic member comprises: a front transparent substrate; a transparent conductive oxide layer disposed on the front transparent substrate; a photoelectric conversion layer disposed on the transparent conductive oxide layer; and a back electrode disposed on the photoelectric conversion layer. The photovoltaic module further comprises a sealing layer sandwiched between the polymeric foam layer and the back electrode, where the sealing layer is in direct contact with the back electrode and the polymeric foam layer of the backsheet. The sealing layer is a layer of ethylene-vinyl acetate copolymer.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The layer of polymeric foam comprises at least one material of polyethylene, copolymer of ethylene and propylene, copolymer of ethylene and 1-butene, copolymer of ethylene and 1-hexene, copolymer of ethylene and 1-octene, copolymer of ethylene and vinyl acetate, copolymer of ethylene and methyl acrylate, copolymer of ethylene and ethyl acrylate, copolymer of ethylene and acrylic acid, or copolymer of ethylene and maleic anhydride. The layer of the polymeric foam has a thickness of greater than 0.05 (preferably 0.2-6.4) mm. The bulk density of the polymeric foam is 0.2-0.46 g/cm3. The layer of polymeric foam comprises a filler. The protective layer comprises metal, polymer and/or inorganic composition. The backsheet further comprises: a first adhesive layer disposed between the protective layer and the layer of the polymeric foam, where the first adhesive layer comprises at least one of a copolymer of ethylene and acrylic acid and a copolymer of ethylene and maleic anhydride; a moisture-barrier layer (140) disposed between the layer of polymeric foam and the protective layer, where the moisture-barrier layer is made of a metallic material; and a second adhesive layer (150) disposed between the moisture-barrier layer and the protective layer, where the second adhesive layer comprises a copolymer of ethylene and acrylic acid or a copolymer of ethylene and maleic anhydride. The polymeric foam has a crosslinked structure. The layer of the polymeric foam comprises many closed cells. The moisture-barrier layer is in contact with the layer of polymeric foam. The first adhesive layer and second adhesive layer, each has a thickness of 0.01-0.5 mm. The filler comprises a zeolite having a pore size of at least 3 Angstrom .