NOVELTY - Solar cell module comprises a solar cell layer and a sheet comprising at least one layer of a nanofilled ionomer composition. The solar cell layer: comprises a single solar cell or many electrically interconnected solar cells; and has a light-receiving side and a non-light-receiving side. The nanofilled ionomer composition comprises: an ionomer that is an ionic, neutralized derivative of a precursor alpha -olefin carboxylic acid copolymer; at least one nanofiller; and optionally a second ionomer.    USE - Used as solar cell module.    ADVANTAGE - The solar cell module utilizes encapsulant layers having reduced creep at elevated temperatures, with improved recyclability, thus exhibiting low degree of creep or heat deformation, and robust performance even at high-temperature operating conditions.    DETAILED DESCRIPTION - Solar cell module comprises a solar cell layer and a sheet comprising at least one layer of a nanofilled ionomer composition. The solar cell layer: comprises a single solar cell or many electrically interconnected solar cells; and has a light-receiving side and a non-light-receiving side. The nanofilled ionomer composition comprises: an ionomer that is an ionic, neutralized derivative of a precursor alpha -olefin carboxylic acid copolymer, where 10-35% of the total content of the carboxylic acid groups present in the precursor alpha -olefin carboxylic acid copolymer is neutralized to form salts containing alkali metal cations, alkaline earth metal cations and/or transition metal cations, and the precursor alpha -olefin carboxylic acid copolymer comprises (a) copolymerized units of an 2-10C alpha -olefin and (b) 15-25 wt.% of copolymerized units of an 3-8C alpha , beta -ethylenically unsaturated carboxylic acid, and the ionomer has a melt flow rate (MFR) of 0.1-60 g/10 minutes; at least one nanofiller; and optionally a second ionomer comprising a parent acid copolymer that comprises copolymerized units of ethylene and 18-30 wt.% of copolymerized units of acrylic acid or methacrylic acid, based on the total weight of the parent acid copolymer. The acid copolymer has a MFR of 200-1000 g/10 minutes, where 50-70% of the carboxylic acid groups of the copolymer, based on the total carboxylic acid content of the parent acid copolymer as calculated for the non-neutralized parent acid copolymer, are neutralized to carboxylic acid salts comprising sodium cations and/or potassium cations, and the second ionomer has a MFR of 1-20 g/10 minutes. The MFR is measured according to ASTM D1238 at 190 degrees C with a 2.16 kg load. An INDEPENDENT CLAIM is also included for preparing the solar cell module, comprising providing an assembly comprising the solar cell layer and the sheet, and laminating the assembly to form the solar cell module, where the laminating step is conducted by subjecting the assembly to heat, optionally further subjecting the assembly to vacuum or pressure.