Choi, Seongmin Yong, Taeyoung Kim, Soo-Kwan Park, Jin Young Han, Sanghun Seo, Gayoung Kim, Hae Jeong Ma, Hyeon Soo Lee, Ju-Hyuck Ko, Seo-Jin Moon, Byung Joon Choi, Jongmin 2026-01-15T09:30:58Z 2026-01-15T09:30:58Z 2026-01-12 2025-12 1614-6832 https://pubs.kist.re.kr/handle/201004/154033 Although perovskite solar cells (PSCs) have recently achieved high certified power conversion efficiencies (PCEs), operational instability remains a critical obstacle to commercialization. In particular, superoxide (O2∙−) generated at metal-oxide charge-transport layers rapidly decomposes perovskites by deprotonating the organic cations (FA⁺ and MA+) and therefore must be suppressed. Nevertheless, under operating illumination, the formation and diffusion of O2∙− are unavoidable as long as metal oxides are employed in PSCs. To address this, we introduce the natural antioxidant taurine at the SnO2/FAPbI3 interface to suppress O2∙− diffusion via chemical radical quenching. We elucidate the taurine-mediated O2∙− quenching mechanism through density functional theory (DFT) calculations supported by experiments. In addition, we find that I2 is concomitantly reduced to I- during the quenching process. This antioxidant interface prevents O2∙− induced perovskite decomposition under strongly oxidizing conditions. Moreover, the multifunctional groups of taurine form a chemical bridge between SnO2 and FAPbI3, reducing interfacial defect density, enhancing carrier mobility, and suppressing non-radiative recombination. Consequently, the taurine-buried interface enables an improved PCE with increased open-circuit voltage (VOC) and fill factor (FF), while markedly enhancing the light-soaking and operational stability of PSCs. English Wiley-VCH Verlag Natural Antioxidant-Inspired Interfacial Engineering for Stable and High-Performance Perovskite Solar Cells Article 10.1002/aenm.202505914 1 Advanced Energy Materials Advanced Energy Materials N scie scopus Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article; Early Access FORMAMIDINIUM STABILITY DEGRADATION LAYERS buried interface chemical radical quenching reactive oxygen taurine