Growing energy demands make cost-effective, high-performance perovskite solar cells (PSCs) desirable. However, their commercial applications are limited due to defect formation and instability. Passivation technologies help enhance their favorable traits. Herein, we propose a pioneering technique utilizing non-thermal plasma (NTP) synthesis for passivating inherent defects and optimizing the energy levels of perovskites. AC-NTP utilizes ionic charges and uniform electric fields to effectively neutralize defect-induced charge traps, acting as a field-effect passivator. This approach not only mitigates energetic defects, but also facilitates the transformation of NH