NOVELTY - The photovoltaic concentrator module for power systems e.g. rooftop mounted systems, comprises a photovoltaic receiver assembly (90) including a wired photovoltaic cell supported upon and thermally coupled to a thermally conductive substrate, and an optic that concentrates incident light onto the receiver assembly. The wired photovoltaic cell (96) comprises a wiring interconnection electrically coupled to the cell. A dielectric layer (94) is interposed between the wired photovoltaic cell and the substrate to electrically isolate the wired photovoltaic cell from the substrate.    USE - The photovoltaic concentrator module is useful for power systems such as rooftop mounted systems and Heliotube.    ADVANTAGE - The photovoltaic concentrator module has improved thermal dissipation, dielectric, encapsulation and cell/wiring protection characteristics, can able to generate sufficient self-power to articulate itself even when not pointed at the sun, and avoids the creation of potentially damaging excessive stresses during lamination using a contour.    DETAILED DESCRIPTION - The photovoltaic concentrator module for power systems e.g. rooftop mounted systems, comprises a photovoltaic receiver assembly (90) including a wired photovoltaic cell supported upon and thermally coupled to a thermally conductive substrate, and an optic that concentrates incident light onto the receiver assembly. The wired photovoltaic cell (96) comprises a wiring interconnection electrically coupled to the cell. A dielectric layer (94) is interposed between the wired photovoltaic cell and the substrate to electrically isolate the wired photovoltaic cell from the substrate. The substrate comprises a contour underlying the wiring interconnection. The contour comprises an arcuate portion including a changing radius of curvature, first and second planes, a transition interconnecting portions of the first and second planes, and a rectangular profile or a trapezoidal profile with rounded corners. The transition is rounded minimally so as to avoid a line of intersection between the interconnected portions. A portion of the contour comprises a continuous or piece-wise continuous profile of any function. The optic comprises a refractive optical element and a reflective optical element, which serve different portions of the primary aperture of the module. The dielectric layer comprises a biaxially oriented polyester film laminated to the substrate and having a thickness of less than 0.03 mm. An upper layer is overlying the cell to encapsulate the wired photovoltaic cell, and is thicker than the dielectric layer. A cover is arranged above the upper encapsulant layer. Each of the upper encapsulant layer and the cover are derived from respective thermoformable films. The wired interconnection fits within the contour. INDEPENDENT CLAIMS are included for:    (1) a photovoltaic receiver; and    (2) a method of making a photovoltaic receiver assembly.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-section view of a solar concentrator module.    Receiver assembly (90)    Contoured substrate (92)    Dielectric layer (94)    Cells (96)    Ribbon wire. (98)