Interfacial engineering has been commonly used as an effective strategy to enhance device performance and stability of perovskite solar cells (PSCs). However, most of the materials used for interface engineering are based on organics, which may have concerns for the device's long-term stability. Therefore, we developed robust fluoro-terminated TiO₂ nanosheets (F-TiO₂ NSs) to work as interlayers between perovskite and electron-transporting layers in inverted PSCs. The flat NS morphology of F-TiO₂ NSs enables close contact with perovskite with abundant surface fluoro groups, which can interact with undercoordinated lead and MA/FA ions to prevent the formation of cation vacancies and alleviate surface defects. As a result, a remarkable power conversion efficiency (PCE) of 22.86% can be achieved. The operational stability of devices with F-TiO₂ NSs interlayers is also enhanced, which can maintain over 90% of their initial PCEs after being monitored at the maximum power point (MPP) for 1,000 h under day/night cycles.

界面工程已被普遍用作提高钙钛矿太阳能电池（PSC）器件性能和稳定性的有效策略。然而，大多数用于界面工程的材料都是基于有机物的，这可能会影响设备的长期稳定性。因此，我们开发了坚固的氟端基 TiO ₂纳米片（F-TiO ₂ NSs），用作倒置 PSC 中钙钛矿和电子传输层之间的夹层。F-TiO ₂的扁平NS形貌NSs 能够与具有丰富表面氟基团的钙钛矿紧密接触，可以与未配位的铅和 MA/FA 离子相互作用，以防止形成阳离子空位并减轻表面缺陷。因此，可以实现 22.86% 的显着功率转换效率 (PCE)。具有 F-TiO ₂ NSs 夹层的器件的运行稳定性也得到增强，在昼夜循环下在最大功率点 (MPP) 下监测 1,000 小时后，可以保持其初始 PCE 的 90% 以上。