โ Scribed by J.G. Werthen
No coin nor oath required. For personal study only.
Multijunction concentrator AIGaAs and GaInAs subcells have been fabricated using metal-organic chemical vapor deposition. Under 400 Suns air mass 1.5, conversion efficiencies as high as 18% have been measured for A1GaAs (1.75 eV) cells grown lattice matched to GaAs. Under similar illumination conditions, GaInAs (1.15 eV) cells, which are grown lattice mismatched to GaAs, have shown conversion efficiencies of 24%. In a stacked multijunction structure the GaInAs cell is expected to provide 12% yielding a potential overall conversion efficiency of 30%. Details of subcell fabrication and testing will be described, along with a discussion about electrical interconnections in multijunction structures.
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