Recent Advances in Microcell Concentrating Photovoltaics for Space
Christian J Ruud1, Brent Fisher2, Jeffrey M. Gordon3, Noel C. Giebink1
1The Pennsylvania State University, University Park, PA, United States
/2H-NU Systems LLC, Bethesda, MD, United States
/3Ben-Gurion University of the Negev, Sede Boqer, Israel

Microscale concentrating photovoltaics can improve the efficiency and reduce the cost of photovoltaic power in space. We report progress on a lightweight, monolithic, and ultrathin reflective concentrator for space based on triple-junction transfer printed microscale photovoltaic cells. The ~1 mm-thick first-generation prototype validates optical modeling and delivers 24% efficiency with a ± 9° acceptance angle. These results provide the foundation for a second-generation prototype based on an optimal paraboloidal reflector that is predicted to achieve a specific power >350 W/kg over an acceptance angle of ± 7°.