Progress in development of all-glass terrestrial concentrator modules based on composite Fresnel lenses and III-V solar cells

• Main Authors: Rumyantsev, V.D., Andreev, V.M., Bett, A.W., Dimroth, F., Hein, M., Lange, G., Shvarts, M.Z., Sulima, O.V.
• Format: Conference Proceeding
• Language: English
• Subjects: Apertures; Copper; Fresnel reflection; Gain measurement; Geometrical optics; Glass; Lenses; Optical refraction; Photovoltaic cells; Solar heating
• ISSN: 0160-8371
• DOI: 10.1109/PVSC.2000.916096

This paper describes an approach in designing of concentrator modules which is very similar to that for flat PV panels. Small-size submodules, each with 4/spl times/4 cm/sup 2/ aperture and 7.5 cm focusing distance, are integrated in a fully hermetic module which is resistant to the environmental influences. Panels of concentrating Fresnel lenses have a composite structure and consist of a silicate glass superstrate and a thin (/spl sim/0.2 mm in average) refractive profile made of transparent silicone. An optical efficiency of the lenses as high as 91.5% was measured. The geometrical concentration ratio of the all-glass module is 130/spl times/. The solar cells are mounted on copper heat-spreaders which are glued to a bottom glass plate. The module cabinet has glass walls sealed to the lens and solar cell panels by means of silicone. The outdoor module efficiencies of 19.3% in the case of single-junction AlGaAs-GaAs cells and 24.8% in the case of two-junction GaInP-GaInAs solar cells were measured.