Silicon solar cells have been the working horses of the photovoltaic industry for decades. Continuous technological progress has led to increases in power conversion efficiency (PCE) and driven the levelized cost of electricity (LCOE) down to 1.33 $ct kWh À1 in sunny regions such as Chile. [1] To continue this success story, the combination of a silicon bottom solar cell with a low-cost, wide-bandgap top cell into a tandem device is perceived as an intriguing technological path toward costeffective multijunction solar cells with PCEs beyond the silicon single-junction efficiency limit of 29.5%. [2] In particular, perovskite/silicon tandem solar cells have triggered impressive research and development that peaked in devices with PCEs approaching 30%. [3][4][5] However, as of late 2021, the majority of the reported monolithic perovskite/silicon tandem solar cells with highest PCE results rely on silicon heterojunction (SHJ) bottom cells, exploiting SHJ's high opencircuit voltages (see, e.g., Jost et al. for a recent review). [6] The

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