Quasi two-dimensional perovskite solar cells (2D PSCs) have received much attention recently due to their unique optoelectronic properties and excellent device stability. Among 2D perovskite, 2D Dion-Jacobson (DJ) perovskite has closer interlayer distance and does not rely on van der Waals interaction between adjacent spacer cations, which can weaken dielectric confinement effect while maintaining its structural stability. Thus, the research interest of 2D DJ PSCs is increasing.