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• The photovoltaic properties of FAPbI 3 PSCs increased by additive and dimensional engineering methods. • Both the nonradiative and radiative recombination processes are suppressed in modified PSCs. • The modified 3D/2D hybrid layer drastically passivates grain boundaries in the FAPbI 3 perovskite layer. • The stability of FAPbI 3 increase by employing the dual additive and dimensional engineering methods. • The presence of NOBF 4 dopant in the 3D/2D heterostructure Increased their benefits on PSCs. Formamidinium lead triiodide (FAPbI 3) perovskite solar cells (PSCs) with a certified 25.5% power conversion efficiency (PCE) are the most promising devices for next-generation of solar cells. Here, we focus on boosting the performance and stability of these types of PSCs through a two-step engineering method, first additive engineering based on propionic acid for 3D FAPbI 3 PSCs. Second, post-treatment of 3D devices with a 2-(4-fluorophenyl)ethyl ammonium iodide (FPEAI) solution doped with nitrosonium tetrafluoroborate (NOBF 4). This two-step approach improves carriers' lifetime and charges separation at 3D/2D perovskite/hole transport layer (HTL), tiding with improvements in photovoltaic properties of corresponding PSCs. Besides, NOBF 4 p-type dopant increases hole mobility at the interface of the 3D/2D hybrid perovskite/HTL, thus providing a road towards more boosting efficiency and stability of PSCs through dimensional engineering. Leading to improved properties of the perovskite, the modified 3D/2D PSCs achieve a PCE of up to 23.18% with long-term shelf, thermal and operational stability. [ABSTRACT FROM AUTHOR]