NOVELTY - The process comprises heating a mixture of quaternary chalcogenide crystals and flux at a temperature of 450-850 degrees C, cooling the mixture to form a solidified mixture of quaternary chalcogenide and flux, isolating ingots (210) of quaternary chalcogenide from the solidified mixture, mounting the ingot in a polymer binder (220) to form a quaternary chalcogenide-polymer composite, and, optionally, slicing the quaternary chalcogenide-polymer composite to form quaternary chalcogenide-polymer composite wafers. The flux comprises an alkali halide and/or an alkaline earth halide.    USE - The process is useful for producing an article such as quaternary chalcogenide wafer (all claimed), which is useful for forming semiconductor devices such as photodiodes and solar cells.    ADVANTAGE - The process is capable of economically, safely and efficiently producing the quaternary chalcogenide wafer with high robustness.    DETAILED DESCRIPTION - The process comprises heating a mixture of quaternary chalcogenide crystals and flux at a temperature of 450-850 degrees C, cooling the mixture to form a solidified mixture of quaternary chalcogenide and flux, isolating ingots (210) of quaternary chalcogenide from the solidified mixture, mounting the ingot in a polymer binder (220) to form a quaternary chalcogenide-polymer composite, and, optionally, slicing the quaternary chalcogenide-polymer composite to form quaternary chalcogenide-polymer composite wafers. The flux comprises an alkali halide and/or an alkaline earth halide. The weight ratio of the quaternary chalcogenide crystals to flux is 10:1 to 1:10. The polymer binder comprises a non-conductive polymer. The composite wafer has a top surface and a bottom surface, and the quaternary chalcogenide ingot is exposed on the top and bottom surfaces of the composite wafer. An INDEPENDENT CLAIM is included for an article having a top surface and a bottom surface.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic top view of a portion of an article.    Article (200)    Quaternary chalcogenide ingot (210)    Polymer binder. (220)