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Models using realistic parameters indicate that two-terminal, double-junction tandem solar cells based on CdTe or CuInGaSe2 and related alloys should be able to reach 25% efficiencies. 1 Key to achieving this is high transparency for below-band-gap photons. Cells with transparent back contacts (TBC) and CdTe thickness between 2.4 μm and 0.3 μm show over 65% average transmission for photons below bandgap...
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