The perovskite solar cell (PSC) based materials have attracted significant attention from researchers all over the globe due to their charge transport properties, high-conversion efficiency, and facile fabrication process. However, commercial use of PSC cells is still challenging due to their poor stability relative to first-generation solar cells. Several factors affect the PSCs efficiency and stability, such as environmental stability, charge transport layer, facile method, temperature, material, bandgap, etc. In this book chapter, we have thoroughly discussed the importance of the bandgap tuning. The bandgap of the material is crucial for conversion efficiency and light harvesting. Perovskite materials demonstrate a broad range of bandgap relative to the optimal bandgap. However, to minimize the bandgap of the perovskite material, we examine methodologies for bandgap modification, including doping, compositional engineering, interface engineering, and dimensional alterations, which enhance the efficiency and stability of perovskite solar cells.