The accelerating impact of climate change and global pollution has led to a rapidly increasing demand for renewable energy sources. Among these, photovoltaic energy has emerged as a leading candidate for achieving sustainability and energy efficiency. However, the development of efficient and stable wide bandgap perovskite materials for use in silicon-perovskite tandem solar cells for even higher power output remains a significant challenge. These materials are critical because defects in the perovskite bulk and at interfaces can increase charge carrier recombination, thereby limiting device performance. This research addresses this challenge by optimizing the wide bandgap perovskite optoelectrical properties via bulk and interfacial modulation.