NOVELTY - A photovoltaic receiver (8) comprises a sunlight concentrator (2) having an optical axis (3) and a curved reflecting surface (2a); a first photovoltaic converter (9) to intercept an incident beam (4, 5) to produce a shadow volume (7a) in the concentrated beam; a second photovoltaic converter (15) within the shadow volume; and a solar spectrum separating mechanism (10) between the first and second converters in order to separate the concentrated beam of sunlight in a first beam (11, 12) and a second beam (13, 14) having a different sunlight spectrum.    USE - A photovoltaic receiver for a photovoltaic generation system (1) (claimed).    ADVANTAGE - The photovoltaic receiver includes the curved reflecting surface concentrator and the solar spectrum separating mechanism to separate the concentrated beam of sunlight to beams having a different sunlight spectrum. It is easy and inexpensive to manufacture.    DETAILED DESCRIPTION - A photovoltaic receiver (8) comprises a sunlight concentrator (2) having an optical axis (3) and a curved reflecting surface (2a) to concentrate, according to a concentrated beam (6, 7) of rays ideally focusing in a focal zone through which the optical axis passes; a first photovoltaic converter (9) to intercept an incident beam (4, 5) to produce a shadow volume (7a) in the concentrated beam; a second photovoltaic converter (15) within the shadow volume; and a solar spectrum separating mechanism (10) between the first and second converters in order to separate the concentrated beam of sunlight in a first beam (11, 12) and a second beam (13, 14) having a different sunlight spectrum and so that the first beam is transmitted to the first converter and the second beam is reflected towards the second converter.    DESCRIPTION OF DRAWING(S) - The drawing is a longitudinal sectional view of the photovoltaic generation system.    Photovoltaic generation system (1)    Sunlight concentrator (2)    Curved reflecting surface (2a)    Optical axis (3)    Incident beam (4, 5)    Concentrated beam (6, 7)    Shadow volume (7a)    Photovoltaic receiver (8)    First photovoltaic converter (9)    Solar spectrum separating mechanism (10)    First beam (11, 12)    Second beam (13, 14)    Second photovoltaic converter (15)