Static photovoltaic concentrators, which see the sky as an extended distribution of radiance, are analyzed in a general way. The rules for achieving the highest energy on the cell are derived and the appropriate figures of merit are defined. It is concluded that casting increasingly high values of energy on the cell, which would be bifacial, require collecting a lower portion of the total sky energy. The corresponding figures of merit for the concentrators of the CPC family are analyzed, concluding that a better type of concentrator should be developed for photovoltaic applications.
© 1983 Optical Society of America
Juan Carlos Miñano and Antonio Luque, "Limit of concentration under extended nonhomogeneous light sources," Appl. Opt. 22, 2751-2760 (1983)