NOVELTY - An optoelectronic device assembly comprises coated element, having thermoplastic substrate (10) comprising bisphenol-A (BPA) polycarbonate homopolymer and polycarbonate copolymer, where polycarbonate copolymer is selected from copolymer of tetrabromobisphenol A carbonate and BPA carbonate, copolymer of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine carbonate and BPA carbonate; and protective weathering layer (12) comprising resorcinol polyarylate and polycarbonate; and optoelectronic device (24) on the coated element.    USE - As optoelectronic device assembly (claimed), optically transparent, plastic article assemblies.    ADVANTAGE - The optically transparent, weatherable, plastic assembly protects optoelectronic devices, such as solar cells, in outdoor working environments for periods of greater than or equal to 20 years under extreme weathering conditions and while maintaining high mechanical toughness, in particular, high resistance to puncture and cutting. The assembly is optically transparent and has extreme weatherability, is optionally hermetic, and has a surface toughness to withstand mechanical damage when subjected to a load of greater than 3 pounds. The assembly comprises a thermoplastic substrate that is mechanically tough and stable in extreme weather conditions.    DETAILED DESCRIPTION - An optoelectronic device assembly comprises coated element, having thermoplastic substrate (10) comprising bisphenol-A (BPA) polycarbonate homopolymer and a polycarbonate copolymer, where the polycarbonate copolymer is selected from a copolymer of tetrabromobisphenol A carbonate and BPA carbonate, a copolymer of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine carbonate and BPA carbonate; a copolymer of 4,4'-(1-phenylethylidene)biphenol carbonate and BPA carbonate; a copolymer of 4,4'-(1-methylethylidene)bis(2,6-dimethyl-phenol)carbonate and/or BPA carbonate; and a protective weathering layer (12) comprising resorcinol polyarylate and polycarbonate; and an optoelectronic device (24) on the coated element, where the optoelectronic device is selected from a light emitting diode and a photovoltaic cell.    DESCRIPTION OF DRAWING(S) - The figure shows cross-sectional view of optoelectronic device assembly.    Thermoplastic substrate (10)    Weathering layer (12)    Oxygen/moisture barrier layer (20)    Adhesive layer (22)    Optoelectronic device (24)    Transparent front sheet (28)