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We derive the photovoltaic conversion efficiency limit for two-terminaltandem solar cells with a perovskite top cell and silicon bottom cell with anembedded spectrum splitter. For large-bandgap top-cells a spectrum splitterstrongly enhances the efficiency because of enhanced light absorption andtrapping. A Lambertian spectral splitter shows a significantly improved effectcompared to a planar splitter: we find an ideal efficiency enhancement in thethermodynamic limit for a 500 nm thick top cell of 6% absolute for bandgapsabove 1.75 eV. Vice versa, the use of a spectral splitter geometry enables theuse of a thinner top cell. Using experimental parameters for perovskite cellswe show that for a top-cell bandgap of 1.77 eV a 2.8% absolute efficiency canbe gained. The calculations in this work show that integration of a spectralsplitter into perovskite/silicon tandem cells with a top bandgap above 1.7 eVcan lead to a large increase in efficiency, even with realistic experimentallosses and non-unity reflection of the spectral splitter.

Detailed-balance efficiency limits of two-terminal perovskite/silicon tandem solar cells with planar and Lambertian spectral splitters