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

作者：Mitchell Bernhard^*; Peharz Gerhard; Siefer Gerald; Peters Marius; Gandy Tobias; Goldschmidt Jan Christoph; Benick Jan; Glunz Stefan W; Bett Andreas W; Dimroth Frank

来源：Progress in Photovoltaics: Research and Applications , 2011, 19(1): 61-72.

DOI：10.1002/pip.988

• high efficiency
• multi-junction
• spectral beam-splitting
• dichroic mirror

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 450 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.

• 出版日期2011-1