In this paper, present status of super-high-efficiency tandem solar cells has been reviewed and key issues for realizing super-high-efficiency have also been discussed. The mechanical stacked 3-junction cells of monolithically grown InGaP/GaAs 2-junction cells and InGaAs cells have reached the highest efficiency achieved in Japan of 33.3 % at 1-sun AM 1.5. Future prospects for realizing super-high-efficiency and low-cost tandem solar cells are also discussed.
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