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

• DOI: 10.1002/solr.202100244
• Publication Date: 2021-04-22T01:04:49Z
• Authors: Eike Köhnen; Philipp Wagner; Felix Lang; Alexandros Cruz; Bor Li; Marcel Roß; Marko Jošt; Anna B. Morales-V...; Marko Topič; Martin Stolterfoht; Dieter Neher; Lars Korte; Bernd Rech; Rutger Schlatmann; Bernd Stannowski; Steve Albrecht
• Keywords: Tandem

Monolithic perovskite/silicon tandem solar cells recently surpass the efficiency of silicon single‐junction cells. Most utilize >250 μm 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 μm. need enlargement has a strong impact future developments ensuring photostable compositions lossless interfaces at bandgaps around or above 1.7 eV.