This research article presents a novel strategy for improving the performance and stability of inverted perovskite solar cells (PSCs) by addressing the issues of polarity mismatch and residual strain at the buried interface. The study introduces a multifunctional hybrid pre-embedding strategy using organic polyelectrolyte (PFN-Br) and imidazolium salts (IAI) to enhance substrate wettability and mitigate unfavorable strain and heterogeneities. The approach involves modifying the hole-transporting layer (PTAA) with PFN-Br/IAI, which reduces residual strain in the perovskite films and facilitates the coordination of Pb²⁺ and halogen compensation at the buried interface. This results in improved crystallinity, reduced nonradiative recombination, and enhanced carrier transport properties. The optimized inverted PSCs based on a 1.62-eV bandgap perovskite achieved a power conversion efficiency (PCE) of 21.93% with excellent intrinsic stability. When extended to RbCsFAMA-based perovskite films with a 1.55-eV bandgap, the champion device achieved a PCE of 23.74%. The strategy also demonstrated remarkable ambient and operational stability, with the optimized perovskite solar cells retaining 91% of their initial efficiency after 960 hours of exposure to 20% relative humidity and a T80 of 680 hours under heating at 65°C. The study highlights the importance of addressing the buried interface in perovskite solar cells to enhance device performance and stability. The hybrid system of PFN-Br and IAI effectively reduces residual strain, compensates for halogen ions, and passivates uncoordinated Pb²⁺ defects, leading to a more uniform and high-quality perovskite film. The results demonstrate that the coembedding strategy not only improves the photovoltaic performance but also enhances the long-term stability of PSCs, offering a simple and effective method for achieving high-performance perovskite solar cells.This research article presents a novel strategy for improving the performance and stability of inverted perovskite solar cells (PSCs) by addressing the issues of polarity mismatch and residual strain at the buried interface. The study introduces a multifunctional hybrid pre-embedding strategy using organic polyelectrolyte (PFN-Br) and imidazolium salts (IAI) to enhance substrate wettability and mitigate unfavorable strain and heterogeneities. The approach involves modifying the hole-transporting layer (PTAA) with PFN-Br/IAI, which reduces residual strain in the perovskite films and facilitates the coordination of Pb²⁺ and halogen compensation at the buried interface. This results in improved crystallinity, reduced nonradiative recombination, and enhanced carrier transport properties. The optimized inverted PSCs based on a 1.62-eV bandgap perovskite achieved a power conversion efficiency (PCE) of 21.93% with excellent intrinsic stability. When extended to RbCsFAMA-based perovskite films with a 1.55-eV bandgap, the champion device achieved a PCE of 23.74%. The strategy also demonstrated remarkable ambient and operational stability, with the optimized perovskite solar cells retaining 91% of their initial efficiency after 960 hours of exposure to 20% relative humidity and a T80 of 680 hours under heating at 65°C. The study highlights the importance of addressing the buried interface in perovskite solar cells to enhance device performance and stability. The hybrid system of PFN-Br and IAI effectively reduces residual strain, compensates for halogen ions, and passivates uncoordinated Pb²⁺ defects, leading to a more uniform and high-quality perovskite film. The results demonstrate that the coembedding strategy not only improves the photovoltaic performance but also enhances the long-term stability of PSCs, offering a simple and effective method for achieving high-performance perovskite solar cells.