Two-dimensional (2D) perovskites solar cells (PSCs) have attracted considerable attention owing to their excellent stability against humidity; however, some imperfectness of 2D perovskites, such as poor crystallinity, disordered orientation, and inferior charge transport still limit the power conversion efficiency (PCE) of 2D PSCs. In this work, 2D Ti₃C₂T_x MXene nanosheets with high electrical conductivity and mobility were employed as a nanosized additive to prepare 2D Ruddlesden–Popper perovskite films. The PCE of solar cells was increased from 13.69 (without additive) to 15.71% after incorporating the Ti₃C₂T_x nanosheets with an optimized concentration. This improved performance is attributed to the enhanced crystallinity, orientation, and passivated trap states in the 3D phase that result in accelerated charge transfer process in vertical direction. More importantly, the unencapsulated cells exhibited excellent stability under ambient conditions with 55 ± 5% relative humidity.

二维 (2D) 钙钛矿太阳能电池 (PSC) 因其优异的耐湿稳定性而备受关注。然而，二维钙钛矿的一些缺陷，如结晶度差、取向无序和电荷传输差，仍然限制了二维 PSC 的功率转换效率（PCE）。在这项工作中，具有高导电性和迁移率的 2D Ti ₃ C ₂ T _x MXene 纳米片被用作纳米添加剂来制备 2D Ruddlesden-Popper 钙钛矿薄膜。_{加入 Ti 3} C ₂ T _x后，太阳能电池的 PCE 从 13.69（无添加剂）提高到 15.71%具有优化浓度的纳米片。这种改进的性能归因于 3D 相中增强的结晶度、取向和钝化陷阱状态，从而导致垂直方向上的电荷转移过程加速。更重要的是，未封装的电池在相对湿度为 55 ± 5% 的环境条件下表现出出色的稳定性。