This study addresses the challenge of scalable fabrication of wide-bandgap perovskite/silicon tandem solar cells in air, where moisture can degrade perovskite films. The researchers found that the properties of the solvent significantly influence moisture interference. They demonstrated that n-Butanol (nBA) mitigates moisture-induced degradation and enhances film uniformity. Using nBA, they achieved a champion efficiency of 29.4% for double-sided textured perovskite/silicon tandem cells with large-size pyramids (2–3 μm) and 26.3% over an aperture area of 16 cm². This approach enables large-scale production of perovskite/silicon tandem solar cells, marking a significant step towards their commercial viability. The study also highlights the importance of solvent engineering in improving the performance and stability of these devices.This study addresses the challenge of scalable fabrication of wide-bandgap perovskite/silicon tandem solar cells in air, where moisture can degrade perovskite films. The researchers found that the properties of the solvent significantly influence moisture interference. They demonstrated that n-Butanol (nBA) mitigates moisture-induced degradation and enhances film uniformity. Using nBA, they achieved a champion efficiency of 29.4% for double-sided textured perovskite/silicon tandem cells with large-size pyramids (2–3 μm) and 26.3% over an aperture area of 16 cm². This approach enables large-scale production of perovskite/silicon tandem solar cells, marking a significant step towards their commercial viability. The study also highlights the importance of solvent engineering in improving the performance and stability of these devices.