Perovskite solar cells (PSCs) suffer from the presence of non‐active and metastable species on the surface of solution‐processed perovskite films, and their adverse effects on charge extraction and long‐term stability cannot be fully addressed by conventional surface passivation strategies. In this study, a novel concept is proposed to achieve both precise removal of surface impurities and effective passivation of sub‐surface defects in a single step, utilizing a functional polymer‐based cleaning strategy. The moderate intermolecular force provided by the functional polymer and their inherent robust interchain interactions enable effective surface cleaning without disturbing the active crystal lattice. Following surface cleaning, the electron‐donating groups (C═O) in the polymer passivate the uncoordinated Pb2+ defects at the sub‐surface level. This synergistic effect of surface cleaning and sub‐surface defect passivation leads to a drastic reduction in interfacial non‐radiative recombination, elimination of ion migration pathways, and prevention of triggers for photodegradation. As a result, the power conversion efficiency (PCE) significantly improved from 22.84% to 25.51%, accompanied by a remarkable enhancement in operational stability. Moreover, the operability and effectiveness of this approach make it highly suitable for scaling up perovskite solar modules in the future.

中文翻译：

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同时去除钙钛矿太阳能电池表面杂质和钝化次表面缺陷的一步清洗工艺

钙钛矿太阳能电池（PSC）的问题是溶液处理的钙钛矿薄膜表面存在非活性和亚稳态物质，它们对电荷提取和长期稳定性的不利影响无法通过传统的表面钝化策略完全解决。在这项研究中，提出了一种新颖的概念，利用基于功能性聚合物的清洁策略，在一步中实现精确去除表面杂质和有效钝化表面下缺陷。功能聚合物提供的适度分子间力及其固有的强大链间相互作用能够有效清洁表面，而不会干扰活性晶格。表面清洁后，聚合物中的给电子基团 (C=O) 钝化了不配位的 Pb2+次表面水平的缺陷。表面清洁和次表面缺陷钝化的协同效应导致界面非辐射复合的急剧减少，消除离子迁移路径，并防止光降解的触发因素。结果，功率转换效率（PCE）从22.84%显着提高至25.51%，同时运行稳定性也显着增强。此外，这种方法的可操作性和有效性使其非常适合未来扩大钙钛矿太阳能模块的规模。