27.9% Efficient Monolithic Perovskite/Silicon Tandem Solar Cells on Industry Compatible Bottom Cells

Monolithic perovskite/silicon tandem solar cells recently surpass the efficiency of silicon single-junction cells. Most utilize >250 ?m thick, planarized float-zone (FZ) silicon, which is not compatible with commercial production using <200 thick Czochralski (CZ) silicon. The based on industrially relevant 100 CZ-silicon without mechanical planarization are demonstrated. best power conversion (PCE) 27.9% only marginally below 28.2% reference value obtained commonly used front-side polished FZ-Si, about three times thicker. With both wafer types showing same median PCE 27.8%, thin CZ-Si-based devices preferred for economic reasons. To investigate perspectives improved current matching and, therefore, further improvement, optical simulations planar and textured have been conducted: perovskite's bandgap needs to be increased by ?0.02 eV when reducing thickness from 280 ?m. need enlargement has a strong impact future developments ensuring photostable compositions lossless interfaces at bandgaps around or above 1.7 eV.