A novel application of a double convex-hemispherical lens configuration for a III-V tandem InGaP/GaAs/Ge multi-junction solar cell

RYAN JAMES M. DUMALAG, ADONIS F. EBOJO JR., JESTER L. MAGAN, ARIS C. LARRODER, and ATHENES JOY P. ABAN

Philippine Science High School – Western Visayas Campus, Brgy. Bito-on, Jaro, Iloilo City 5000, Department of Science and Technology, Philippines

Abstract

Concentrator photovoltaics require solar trackers to maximize sunlight capture. However, solar trackers are expensive both in components and utility. In this study, the lens configuration was modified to eliminate the need for solar trackers, as well as improve power output. This configuration consisted of a double convex, hemispherical lens, and a Fresnel lens all positioned on top of the multi-junction solar cell. The double convex-hemispherical lens (DCX-HSL) setup was based on the Fresnel lens setup which is composed of a Fresnel lens placed on top of the multi-junction solar cell. To test the merits of the DCX-HSL setup, it was tested against a signal Fresnel lens concentrator over the course of one photoperiod. The results showed that there is a significant difference in the power output of the DCX-HSL to the Fresnel lens setup from 10:15 to 14:15. The improvement of the power output from 10:15 to 14:15 is due to the added convex lens and hemispherical lens that focuses more light to the solar cell.

Keywords: three-lens system, concentrator photovoltaic, hemispherical lens, convex lens