Increasing the efficiency of concentrator photovoltaic units with focons as secondary optical concentrators

Concentrator photovoltaic module with Fresnel lenses as primary optical elements and focons made of sheet aluminum as the secondary optical concentrators has been developed. To enhance the efficiency of conversion of solar energy into electrical the optimal focon design have been determined and the photoelectric characteristics of a module with such focons investigated. Implementation of focons in module design allowed to increase acceptance angle of the latter from $\pm$ 0.45$^\circ$ (without focons) up to $\pm$ 0.85$^\circ$ (with focons) and to increase the efficiency from 29% to 32.8%.