TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Agent: The nucleating agent is chosen from phosphate ester metal salt nucleating agent, sorbitol group nucleating agent or carboxylic acid metal salt nucleating agent.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: The alpha -olefin-type polymer is chosen from ethylene- alpha -olefin copolymer or propylene/ alpha -olefin copolymer having density of 0.86-0.92 g/cm3. The ethylene alpha -olefin copolymer has density of 0.86-0.92 g/cm3, melt flow rate of 0.05-50 g/10 minutes at 190 degrees C and load of 21.18 N, melt viscosity of less than 9x 104 poise at 100 degrees C and shear rate of 2.43x 10 second-1, and melt-viscosity of less than 1.8x 104 poise at 100 degrees C and shear rate of 2.43x 10 second-1. The alpha -olefin type polymer is manufactured using single site-type catalyst. The resin material contains ethylene- alpha -olefin copolymer (95-5) and other polyolefin resin (5-95) chosen from high pressure radical low density polyethylene, ethylene vinyl ester copolymer, very low density polyethylene resin having density less than 0.86-0.91 g/cm3, linear low density polyethylene resin having density less than 0.91-0.94 g/cm3, high density polyethylene resin having density of 0.94-0.97 g/cm3, ethylene- alpha -olefin copolymer rubber and polypropylene resin. The resin composition further contains additive chosen from crosslinking agent, crosslinking adjuvant, silane coupling agent, antioxidant, ultraviolet absorber and optical stabilizer. Preferred Module: The solar cell module has a surface protection material, the sealing material, solar cell element and back surface protective material. The solar cell module has a water vapor barrier layer. The water vapor barrier layer is film containing resin chosen from polyester-type resin, polyamide-type resin, ethylene vinyl acetate copolymer saponified substance, polyvinylidene chloride-type resin, fluorine resin and polypropylene resin, stretched film of resin or film formed by vapor-depositing inorganic oxide on surface of the resin.