Abstract
The present status of superhigh-efficiency tandem solar cells has been reviewed and the key issues for realizing superhigh-efficiency have been discussed. The mechanical, stacked, three-junction cells of monolithically grown InGaP/GaAs two-junction cells and InGaAs cells have reached the highest efficiency (attainable in Japan) of 33.3% at 1-sun AM 1.5. Future prospects for realizing superhigh-efficiency and low-cost tandem solar cells are discussed.
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