NOVELTY - The device such as photovoltaic box (10) has a semi-conductor optical gate wedge (14) which is arranged proximate to a focal point of collimating optic (12) for dispersing incident solar radiation into adjacent wavelength bands. An array (18) of photovoltaic cells (22,24,26,28,30) is formed from a material for absorbing and converting a corresponding wavelength band dispersed by the wedge into electrical energy. A refracting optic (16) is arranged between the wedge and array for directing separated wavelength bands onto corresponding photovoltaic cells.    USE - Solar photovoltaic energy generating device e.g. photovoltaic box for supplying power to remote sites on earth and for space vehicle.    ADVANTAGE - The semiconductor optical gate wedge for dispersing incident solar radiation into adjacent wavelength bands, are provided with coatings in order to reduce reflection losses. Each semi-conducting material in a cell in the dispersed array is arranged to only the wavelength range from the incident solar spectrum that matches the materials ability to absorb and convert sunlight into electricity. The unstacked solar cell arrays can be built with much lower processing costs using plentiful and less expensive materials than existing multi-junction cells. The efficiency and effectiveness of the device can be improved by arranging the refracting optic for spatially dispersing light from the wedge onto the photovoltaic cells incident perpendicular to the cell surfaces. The efficiency of the photovoltaic cells can be improved by the optical gate wedge which is made to cause dispersion sufficient to overcome the limitation imposed by the optics of the angular diameter of the sun.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for optimization of photovoltaic cell array.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the photovoltaic box for generating solar photovoltaic energy.    Photovoltaic box (10)    Collimating optic (12)    Semi-conductor optical gate wedge (14)    Refracting optic (16)    Array of photovoltaic cells (18)    Photovoltaic cells (22,24,26,28,30)