Perovskite solar cells (PSCs) have garnered tremendous attention in recent years due to their impressive increase in power conversion efficiency (PCE) from 3.8% to 26.1%, using a single-junction structure over the past decade. 1 Researchers have also explored integrating PSCs into silicon-based tandem structures, showing potential to surpass the current practical PCE limit of crystalline-silicon solar cells. 2− 5 A recent breakthrough of a monolithic perovskite/silicon tandem cell achieving a PCE of 33.7% highlights the practicality and capability of this approach to exceed PCEs of group III− V-based tandem cells. 1 The perovskite/silicon tandem has received significant interest from academia and industry, particularly focusing on the wide-bandgap perovskite top cells in the tandem configuration, which are essential for the success of perovskite/silicon tandem cells. Wide-bandgap PSCs present challenges such as open-circuit voltage (VOC) loss, primarily caused by non-radiative recombination and the Hoke’s effect due to the mixed-halide composition. 6, 7 Another critical concern for wide-bandgap PSCs is scalability, as they are intended as top cells for larger silicon cells (≥ M6, 166 mm× 166 mm) used in industry. Upscaling using glovebox-based solution processes is not feasible for commercial applications, necessitating the fabrication of wide-bandgap PSCs in ambient air for commercial manufacturing processes. 8− 11 However, PSCs are highly sensitive to the ambient environment, particularly humidity during the fabrication process, which poses a significant challenge in achieving high-quality widebandgap PSCs in ambient air. 12, 13 The variations in device performance attributed to this sensitivity to humidity during fabrication could be a major obstacle hindering the commercialization of PSCs. Therefore, fabricating highperforming, minimized VOC-loss, wide-bandgap PSCs in ambient air with consistent performance is a challenging but crucial goal. In this Viewpoint, the influence of humidity during fabrication in ambient-air-processed PSCs will be discussed. Furthermore, we propose a simple and effective approach to enhance the performance of inverted widebandgap PSCs while reducing their dependence on humidity using surface treatment on the air-processed perovskite films via organic halides.