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Solar cell characteristics of a-Si/nc-Si tandem devices as a function of substrate texture. Symbols indicate the characteristics of the best (closed) and average of best 5 (open) cells on a substrate, based on conversion efficiency. Symbol type indicates results of devices with high-EG a-Si (diamond) and low-EG a-Si (circle). Jsc is obtained from EQE-measurements and is presented separately for the bottom nc-Si junction, top a-Si junction and sum of both junctions.
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