Structural Mechanisms of Quasi-2D Perovskites for Next-Generation Photovoltaics

• Quasi-2D perovskites combine the stability of 2D and efficiency of 3D perovskites, offering a promising route for next-generation photovoltaics. • The review highlights structural advantages and challenges of quasi-2D perovskites, including Ruddlesden-Popper and Dion-Jacobson phases. • Unique additive methods specific to quasi-2D perovskites are suggested to enhance device performance and stability. • Material and device analysis using Ruddlesden-Popper, Dion-Jacobson, and alternating cation phases are discussed to provide engineering insights.