Abstract
Large-area hydrogenated amorphous silicon solar cells with a two-stacked p-i-n junction tandem structure are practical solar cells with high conversion efficiency and reliability. We attained a total-area efficiency of 10.05% for a 30 cm × 40 cm tandem submodule. We found that the initial degradation of these tandem cells was about 15% on the initial value. Using these results, we discuss the feasibility of a stable 10% efficient a-Si photovoltaic module.
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