Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 6, Issue 1, Pages 358-365Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2015.2494690
Keywords
Luminescent coupling; mechanical stack; multijunction solar cell; photon recycling; III-V solar cell
Funding
- IOF grant from the People Program (Marie Curie Actions) of the European Union's Seventh Framework Program (FP7) under REA Grant [299878]
- U.S. Department of Energy [DE-AC36-08GO28308]
- National Renewable Energy Laboratory
- DOE/EERE FPACE1 program [24619]
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Multijunction solar cells can be fabricated by mechanically bonding together component cells that are grown separately. Here, we present four-junction four-terminal mechanical stacks composed of GaInP/GaAs tandems grown on GaAs substrates and GaInAsP/GaInAs tandems grown on InP substrates. The component cells were bonded together with a low-index transparent epoxy that acts as an angularly selective reflector to the GaAs bandedge luminescence, while simultaneously transmitting nearly all of the subbandgap light. As determined by electroluminescence measurements and optical modeling, the GaAs subcell demonstrates a higher internal radiative limit and, thus, higher subcell voltage, compared with GaAs subcells without the epoxy reflector. The best cells demonstrate 38.8 +/- 1.0% efficiency under the global spectrum at 1000 W/m(2) and similar to 42% under the direct spectrum at similar to 100 suns. Eliminating the series resistance is the key challenge for further improving the concentrator cells.
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