Aromatic Cage Mediated Surfacial Passivation for Photovoltaic Perovskites

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Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

ABSTRACT The chemical imperative of surface passivation for perovskite solar cells (PSCs) is hindered by the non‐complementary mechanisms employed by current aliphatic and aromatic ammonium halides. Even the widely used aromatic passivator 2‑(4‑fluorophenyl)ethylammonium iodide (FPEAI) faces efficiency limitations due to residual lead defects and interfacial charge‑transport barriers. Through mechanistic analysis of the functional moieties in FPEAI, we designed and synthesized novel passivation molecules, elucidating the respective roles of lead‑chelation, π‑conjugation, and steric hindrance in defect suppression. The optimized molecule 2‐(methylthio)ethoxy‐p‐phenylene ethylammonium iodide (OSPEAI) forms a coordinative cage‑like architecture around Pb 2 + sites via synergistic aliphatic‑chain and benzene‑ring interactions, effectively passivating lead‑related defects and inhibiting non‑radiative recombination. As a result, OSPEAI‑modified PSCs achieved a power conversion efficiency of 26.35% with enhanced operational stability, offering innovative molecular‑design insights for chemical passivation in perovskite photovoltaics.

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