A novel space photovoltaic module using a linear Fresnel lens and a line-focus tandem cell receiver

In late 1992 NASA Lewis began working with ENTECH, Inc. and JX Crystals on the development of a refractive linear photovoltaic concentrator array for use in space. The linear Fresnel lens concentrator is a high-efficiency optical device that is easily manufacturable using a low-cost, roll-to-roll fabrication process. This concentrator lens design is being combined with a novel line-focus GaAs/GaSb tandem cell receiver which uses an optical secondary to direct light away from the cell interconnects as well as provide increased sunlight concentration and radiation protection to the cell. The linear Fresnel lens concentrator has the advantages of high array efficiency and an inherently radiation-hard array design while requiring precise tracking only within a single axis. This paper discusses the linear Fresnel lens concentrator concept and the prototype hardware built to date