@article{KoehnenWagnerLangetal., author = {K{\"o}hnen, Eike and Wagner, Philipp and Lang, Felix and Cruz, Alexandros and Li, Bor and Roß, Marcel and Jošt, Marko and Morales-Vilches, Anna B. and Topič, Marko and Stolterfoht, Martin and Neher, Dieter and Korte, Lars and Rech, Bernd and Schlatmann, Rutger and Stannowski, Bernd and Albrecht, Steve}, title = {27.9\% Efficient Monolithic Perovskite/Silicon Tandem Solar Cells on Industry Compatible Bottom Cells}, series = {Solar RRL}, volume = {5}, journal = {Solar RRL}, number = {7}, publisher = {Wiley}, doi = {10.1002/solr.202100244}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:523-15145}, pages = {8}, abstract = {Monolithic perovskite/silicon tandem solar cells recently surpass the efficiency of silicon single-junction solar cells. Most tandem cells utilize >250 μm thick, planarized float-zone (FZ) silicon, which is not compatible with commercial production using <200 μm thick Czochralski (CZ) silicon. The perovskite/silicon tandem cells based on industrially relevant 100 μm thick CZ-silicon without mechanical planarization are demonstrated. The best power conversion efficiency (PCE) of 27.9\% is only marginally below the 28.2\% reference value obtained on the commonly used front-side polished FZ-Si, which are about three times thicker. With both wafer types showing the same median PCE of 27.8\%, the thin CZ-Si-based devices are preferred for economic reasons. To investigate perspectives for improved current matching and, therefore, further efficiency improvement, optical simulations with planar and textured silicon have been conducted: the perovskite's bandgap needs to be increased by ≈0.02 eV when reducing the silicon thickness from 280 to 100 μm. The need for bandgap enlargement has a strong impact on future tandem developments ensuring photostable compositions with lossless interfaces at bandgaps around or above 1.7 eV.}, language = {en} }