Si-perovskite tandem photovoltaic devices in the four-terminal (4T) configuration could proffer a solution to the problems associated with the stability gap between the component perovskite and Si devices. The fabrication of NIR-transparent perovskite solar cells (PSCs) with the stable triple cation perovskite as the photoabsorber and subsequent integration with a Si solar cell in a 4T tandem device is reported. The critical development of the sputtered top transparent conducting electrode (TCE) layer and oxide buffer layer at room temperature (25 °C) leads to reproducible, highly efficient NIR-transparent PSCs of both small area (0.175 cm 2 ) with power conversion efficiency (PCE) of 17.1% and large area (0.805 cm 2 ) with PCE of 16.0%. Electrically disparate, optically coupled 4T tandem devices of the optimized PSCs with commercial monocrystalline PERC Si solar cells exhibit greater than 26% PCE. In addition to enabling industrycompatible TCE-based low-cost Si/perovskite tandem photovoltaics, this study could also be the gateway for the potential use in niche applications like building integrated photovoltaics.

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