Relaxed Current Matching Requirements in Highly Luminescent Perovskite Tandem Solar Cells and Their Fundamental Efficiency Limits

Perovskite-based tandem solar cells are of increasing interest as they approach commercialization. Here we use experimental parameters from optical spectroscopy measurements to calculate the limiting efficiency perovskite–silicon and all-perovskite two-terminal tandems, employing currently available bandgap materials, 42.0% 40.8%, respectively. We show luminescence coupling between subcells (the transfer photons high-bandgap low-bandgap subcell) relaxes current matching when subcell is a luminescent perovskite. that becomes important at charge trapping rates (≤106 s–1) already being achieved in relevant halide perovskites. Luminescence increases flexibility thicknesses tolerance different spectral conditions. For maximal benefit, should have higher short-circuit under average This can be by reducing subcell, allowing wider, unstable compositions avoided. Lastly, visualize an through cross-section imaging.