NOVELTY - A solar cell module (20) comprises a solar cell layer (14) and a sheet comprising at least one layer of sodium ionomer composition. The sodium ionomer composition consists of a sodium ionomer which is an ionic and neutralized derivative of a alpha -olefin carboxylic acid copolymer precursor. The total content of carboxylic acid groups in copolymer precursor is 10-35%. The copolymer precursor comprises copolymerized units of 2-10C alpha -olefin and copolymerized units of 3-8C alpha , beta -ethylenically unsaturated carboxylic acid (20-25 wt.%) based on total weight of copolymer.    USE - Solar cell module.    ADVANTAGE - The solar cell module has high output characteristics. The sodium ionomer composition forms solar cell layer with low haze value, and improved toughness and transparency.    DETAILED DESCRIPTION - A solar cell module (20) comprises a solar cell layer (14) and a sheet comprising at least one layer of sodium ionomer composition. The solar cell layer is a layer comprising a single solar cell and/or a layer comprising several electrically interconnected solar cells. The solar cell layer has a light-receiving side and a non-light-receiving side. The sodium ionomer composition consists of a sodium ionomer which is an ionic and neutralized derivative of a alpha -olefin carboxylic acid copolymer precursor. The total content of carboxylic acid groups in alpha -olefin carboxylic acid copolymer precursor is 10-35%. The copolymer precursor comprises copolymerized units of 2-10C alpha -olefin and copolymerized units of 3-8C alpha , beta -ethylenically unsaturated carboxylic acid (20-25 wt.%) based on total weight of alpha -olefin carboxylic acid copolymer. An INDEPENDENT CLAIM is included for manufacture of solar cell module.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of solar cell module.    Incident layer (10)    Front encapsulant layer (12)    Solar cell layer (14)    Back encapsulant layer (16)    Backing layer (18)    Solar cell module (20)