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LPE-GaAs and LBSF-Si solar cells for tandem concentrator application

: Blieske, U.; Sterk, S.; Schumacher, J.; Wettling, W.; Marti, A.; Terron, M.J.; Luque, A.; Bett, A.W.


IEEE Electron Devices Society; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE First World Conference on Photovoltaic Energy Conversion 1994. Vol.2 : Conference record of the Twenty Fourth IEEE Photovoltaic Specialists Conference 1994; Hilton Waikoloa Village, Waikoloa, Hawaii, December 5 - 9, 1994
Piscataway, NJ: IEEE Service Center, 1994
ISSN: 0160-8371
ISBN: 0-7803-1460-3
ISBN: 0-7803-1459-X
ISBN: 0-7803-1461-1
World Conference on Photovoltaic Energy Conversion <1, 1994, Waikoloa/Hawaii>
Photovoltaic Specialists Conference <24, 1994, Waikoloa/Hawaii>
Conference Paper
Fraunhofer ISE ()

Design and efficiency measurements of a mechanically stacked concentrator tandem solar cell are presented. The GaAs cell was grown by the LPE etch-back-regrowth method and has a diameter of 4 mm. The silicon solar cell is a high efficient LBSF concentrator solar cell of 5 mm diameter. Special care was taken to optimize the antireflection coatings on the back and front side of the GaAs solar cell. Both cells were processed at FhG-ISE in Freiburg. Their short circuit currents were measured at the ISE calibration laboratory under AM1.5d conditions. The efficiency measurements were performed at UPM-IES in Madrid under outdoor conditions. At 27 suns (AM1.5d, 25°C) the GaAs cell showed an efficiency of 22.9% and the silicon cell an efficiency of 2.9%. The two single cell efficiencies add to a tandem efficiency of 25.8% for the four terminal operation.