NOVELTY - The solar cell module comprises a solar cell layer (14) and an ionomer sheet. The solar cell layer comprises a single solar cell or electrically interconnected solar cells. The ionomer sheet comprises an ionomer composition. The ionomer composition comprises a first ionomer (60-90 wt.%) and a second ionomer (5-40 wt.%) that is the neutralized product of a first precursor acid copolymer and second precursor acid copolymer respectively. The first precursor acid copolymer comprises 20-25 wt.% of copolymerized units of a first alpha -olefin having 2-10 carbon atoms.    USE - Used as a solar cell module.    ADVANTAGE - The solar cell module has improved optical properties including haze and clarity, high impact resistance, penetration resistance and moisture resistance, good UV light resistance, long term thermal stability and weatherability.    DETAILED DESCRIPTION - The solar cell module comprises a solar cell layer (14) and an ionomer sheet. The solar cell layer comprises a single solar cell or electrically interconnected solar cells. The ionomer sheet comprises an ionomer composition. The ionomer composition comprises a first ionomer (60-90 wt.%) and a second ionomer (5-40 wt.%) that is the neutralized product of a first precursor acid copolymer and second precursor acid copolymer respectively. The first precursor acid copolymer comprises 20-25 wt.% of copolymerized units of a first alpha -olefin having 2-10 carbon atoms and 20-30 wt.% based on the total weight of the first precursor acid copolymer of copolymerized units of a first alpha , beta -ethylenically unsaturated carboxylic acid having 3-8 carbon atoms, and produces a sodium ionomer, when neutralizes to a level of 40-90% and when comprises counterions that consist essentially of sodium cations. The second precursor acid copolymer comprises 20-25% of the copolymerized units of a second alpha -olefin having 2-10 carbon atoms and 18-30 wt.% of copolymerized units of a second alpha , beta -ethylenically unsaturated carboxylic acid having 3-8 carbon atoms. The second alpha -olefin is the same as or different from the first alpha -olefin. The second alpha , beta -ethylenically unsaturated carboxylic acid is same as or different from the first alpha , beta -ethylenically unsaturated carboxylic acid. The carboxylic acid groups has a total content of 40-70% present in the first precursor acid copolymer neutralized by a sodium ion-containing base, and has the total content 10-60% present in the first precursor acid copolymer neutralized by a zinc ion-containing base. The first ionomer has a melt flow rate of 0.7-10 g/10 min, and has a freeze enthalpy of less than 2 j/g. The second ionomer has a melt flow rate of less than 5 g/10 min. The first and second ionomers have neutralized by a sodium ion-containing base. The ionomer sheet is present in the form of a monolayer sheet, consists essentially of the ionomer composition, comprises sub-layers, has a total thickness of 0.025-3 mm, and is directly laminated to the solar cell layer, which has a front sun-facing side and a back non-sun-facing side. One of the sub-layers consists essentially of the ionomer composition. The solar cell module further comprises a front encapsulant layer (12) laminated to the sun-facing side of the solar cell layer, a back encapsulant layer (16) laminated to the non-sun-facing side of the solar cell layer, an incident layer (10), and a backing layer (18). The incident layer is an outermost surface layer of the module, is positioned on the sun-facing side of the solar cell layer, and is glass sheets, polymeric sheets and polymeric films. The backing layer is an outermost surface layer of the module, is positioned on the non-light receiving side of the solar cell layer, and is glass sheets, polymeric sheets, polymeric films, metal sheets and ceramic plates. An INDEPENDENT CLAIM is included for a process for preparing a solar cell module.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a wafer-based solar cell module.    Incident layer (10)    Front encapsulant layer (12)    Solar cell layer (14)    Back encapsulant layer (16)    Backing layer. (18)