The work presented in this paper is concerned with fabrication of concentrator modules based on linear Fresnel lenses and photoreceivers with mechanically stacked tandem GaAs/GaSb cells. The manufactured module (with an aperture of 10 cm x 10 cm) consists of four Fresnel lenses with focal distance of 23 mm and dimensions of 250 cm2 each; four main photoreceivers of 10 cm length made of GaAs/GaSb tandem solar cells with seondary cylindrical lenses; additional photoreceivers with total aperture square of about 10 cm2 for providing off-pointing tolerance; heat sink made of aluminium. Fresnel lenses with efficiency of 88 % were made of silicone formed on shock-proof radiation-resistant UV-protective glass of 0.2 mm thickness. This design and the selected materials guarantee a high radiation resistance and low weight of the concentrator. The linear receiver efficiencies of 24 to 25 % (AM0, 25 deg C) were obtained at geometrical sunlight concentration of 6 to 11 times. The estimated module efficiency is about 21 % (AM0, 25 deg C).
Space photovoltaic modules with short-focal-length linear refractive concentrators
2000
4 Seiten, 11 Bilder, 9 Quellen
Conference paper
English
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