In recent years, perovskite solar cells have flourished, and with their significant advantages such as low production cost and high efficiency, they have rapidly become the hot topics in the field of emerging solar cells. Among them, the regular structure (n-i-p) perovskite solar cell has higher conversion efficiency. This article will provide an extended description of this system and discuss the causes of current-voltage (J-V) hysteresis that are common in perovskite solar cell measurements. Perovskite interface treatment and 2D/3D perovskite mixing practices for the improvement of performance and stability of perovskite solar cells are also discussed.