Hybrid natural–inorganic steel halide perovskites (HOIPs) have gained vital analysis curiosity as a result of their tunable optoelectronic properties and ease of fabrication. Enhancing the soundness and effectivity of perovskite supplies may be achieved by way of the passivation of faulty surfaces and the development of interfacial properties. On this research, we introduce a zwitterionic compound, PPS (3-(1-pyridinio)-1-propanesulfonate), as a bifunctional materials that serves as an additive and an interlayer. Incorporating PPS into the perovskite movie successfully reduces each positively and negatively charged defects, resulting in improved floor morphology and a discount in undesired cost provider recombination. Moreover, the formation of a PPS interlayer on SnO₂ improves the SnO₂/perovskite interfacial traits, thereby enhancing cost provider extraction. Consequently, the photodetector displays a low darkish present of 6.05 × 10⁻¹¹ A, a wonderful responsivity of 5.93 A W⁻¹, a detectivity of 1.51 × 10¹³ J, and an on/off ratio of 1.2 × 10⁴ underneath open-air situations. Furthermore, the system demonstrates excellent stability, retaining 80% of its authentic responsivity in an ambient setting. This work highlights the nice potential of dual-functional supplies for defect passivation in future optoelectronic units, emphasizing the significance of floor modification and interface engineering for improved efficiency and stability.