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We have fabricated Si/Ge stack junction solar cells in order to overcome silicon single junction limit efficiency. Ge cell can absorb long wavelength photons that cannot be absorbed in Si. Bottom Ge solar cell can theoretically yield additional 5% efficiency to Si top cell. We have fabricated 21.3% top Si / 1.6% bottom Ge stack junction with 22.9% module efficiency. SiO2 and SiNx double insulating...
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