Abstract: A primary optic for a light-emitting diode or device (LED) includes a tilted wedge atop a truncated compound parabolic concentrator (CPC). The CPC includes an input face and a lower exterior surface defined by a tilted parabolic segment rotated about an axis. The bottom end of the lower exterior surface joins the perimeter of the input face. The tilted wedge includes an upper exterior surface above the lower exterior surface, and an interior conical surface surrounded by the lower and the upper exterior surfaces. The upper exterior surface is defined by a tilted straight line rotated about the axis. The interior conical surface is defined by a smooth curve rotated about the axis. The interior conical surface has a vertex located at the axis and within the lower exterior surface. The top ends of the interior conical surface and the upper exterior surface join to define an output aperture.

Abstract: A primary optic for a light-emitting diode or device (LED) includes a tilted wedge atop a truncated compound parabolic concentrator (CPC). The CPC includes an input face and a lower exterior surface defined by a tilted parabolic segment rotated about an axis. The bottom end of the lower exterior surface joins the perimeter of the input face. The tilted wedge includes an upper exterior surface above the lower exterior surface, and an interior conical surface surrounded by the lower and the upper exterior surfaces. The upper exterior surface is defined by a tilted straight line rotated about the axis. The interior conical surface is defined by a smooth curve rotated about the axis. The interior conical surface has a vertex located at the axis and within the lower exterior surface. The top ends of the interior conical surface and the upper exterior surface join to define an output aperture.

Abstract: A light trapping layer for use in a thin film solar cell is provided. The light trapping texture enhances efficiency of the thin film solar cell. The light trapping layer has a plurality of substantially flat areas between a plurality of periodically repeating non-pointed depressions with rounded edges. The plurality of substantially flat areas facilitates deposition and growth of a layer of transparent conductive oxide over said light trapping layer. The plurality of periodically repeating non-pointed depressions with rounded edges limit formation of at least one of cracks, voids, and low density areas in semiconductor layers of the thin film solar cell. Period of the non-pointed depressions ranges between 100 nanometers and 1500 nanometers, and depth of said non-pointed depressions ranges between 50 nanometers and 1200 nanometers.