NOVELTY - The solar cell is coupled to reflectors (70,71) so to form an elementary component (20,21) with the cell whose reflectors have free extremities (E2,E2'). The mechanical flexibility of the reflectors is determined so that they remain erected with the extremities pointing outwards in the absence of vertical pressure, where the upper surfaces (701,711) face the exterior and the lower surfaces (702,712) face the panel. In the folded configuration under vertical pressure the upper surfaces face the panel and the lower surfaces face the exterior.    USE - In solar cells for space applications, in particular for solar panels of solar generators with local concentration of solar radiation, for reflecting solar radiation to photovoltaic cells; for use in space vehicles such as a satellite.    ADVANTAGE - The photoelectric output can be optimized at the time of placing the cell. The replacement of defective cells is facilitated.    DETAILED DESCRIPTION - The cell is placed onto the central part of the reflector so that the extremities form two lateral sub-reflectors of the cell. The reflector is made of electrically insulating material, for example Kapton (TM), and reinforced with a material, for example titanium. The reflector comprises a base part (12,13) where the cell is placed, so that the base and the two sub-reflectors form a single piece. The upper extremities of the sub-reflectors are equipped with reflecting films (700,710). The reflector has mechanical properties such that the erected position is an equilibrium position, also in the case of a concavity of the surface. Each reflector (70,71) is flat with the exception of free extremities (E2,E2') which are rounded so to support contact under vertical pressure in unfolding. The lower surfaces (702,712) have low coefficient of friction. In a variant of the device, the sub-reflectors are made of a reflecting film and fastened by electrically insulating attachments to the cell which is placed on an electrically insulating support. In another variant of the device, an electrically insulating current support is formed according to a double-inflexion profile where an extremity of a support rests on an extremity of a support of an adjacent cell. A panel (claimed) of solar generator comprises the solar cell (claimed), and a space vehicle (claimed), particularly satellite, comprises the panel of solar generator.    DESCRIPTION OF DRAWING(S) - The drawing is a cross-sectional side view of a section of the panel, that is the reflectors of two neighboring cells, in unfolded position, and in the first embodiment.    Cells (9)    Panel support (10)    Base parts of reflectors (12,13)    Concavity (14)    Elementary components (20,21)    Insulating adhesive layer (22)    Reflectors (70,71)    Reflecting films (700,710)    Upper surfaces of reflectors (701,711)    Lower surfaces of reflectors (702,712)    Extremities of reflectors (E2,E2')