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Four-junction spectral beam-splitting photovoltaic receiver with high optical efficiency

: Mitchell, B.; Peharz, G.; Siefer, G.; Peters, M.; Gandy, T.; Goldschmidt, J.C.; Benick, J.; Glunz, S.W.; Bett, A.W.; Dimroth, F.


Progress in Photovoltaics 19 (2011), Nr.1, S.61-72
ISSN: 1062-7995
Fraunhofer ISE ()
III-V-Solarzellen; Spektrale Aufteilung

A spectral beam-splitting architecture is shown to provide an excellent basis for a four junction photovoltaic receiver with a virtually ideal band gap combination. Spectrally selective beam-splitters are used to create a very efficient light trap in form of a 45° parallelepiped. The light trap distributes incident radiation onto the different solar cells with an optical efficiency of more then 90%. Highly efficient solar cells including III-V semiconductors and silicon were fabricated and mounted into the light trapping assembly. An integrated characterization of such a receiver including the measurement of quantum efficiency as well as indoor and outdoor I-V measurements is shown. Moreover, the optical loss mechanisms and the optical efficiency of the spectral beam-splitting approach are discussed. The first experimental setup of the receiver demonstrated an outdoor efficiency of more than 34% under unconcentrated sunlight.