Crystal orientation of perovskite film and interface modification plays an important role in the efficient operation and stability of perovskite solar cells (PSC). Herein, a high quality perovskite film with large grain size, high crystallinity and preferred crystal orientation on (100) plane is deposited on an aqueous solvent (H₂O and DMF) pretreated nickel oxide (NiO_x) substrate (HDP). The aqueous solvent treatment increases the wettability and conductivity of NiO_x layer during perovskite growth. Steady-state and time-resolved photoluminescences reveals a significantly increased charge extraction efficiency in the HDP perovskite films. In addition, the HDP devices exhibit impressively improved photovoltaic performance as well as enhanced long-term stability under high moisture, UV irradiation and thermal stress. Therefore, our work provides a versatile strategy to introduce preferred orientation and interfacial modification to enhance the crystal quality and stability of halide perovskite thin films and related optoelectronic devices.

钙钛矿薄膜的晶体取向和界面改性在钙钛矿太阳能电池（PSC）的有效运行和稳定性中起着重要作用。在此，在水溶剂（H ₂ O和DMF）预处理的氧化镍（NiO _x）衬底（HDP）上沉积具有大晶粒尺寸，高结晶度和在（100）面上的优选晶体取向的高质量钙钛矿膜。水性溶剂处理可提高NiO _x的润湿性和电导率钙钛矿生长过程中的有机层。稳态和时间分辨的光致发光揭示了HDP钙钛矿薄膜中电荷提取效率的显着提高。此外，HDP器件在高湿气，紫外线辐射和热应力下具有出色的光伏性能以及长期稳定性。因此，我们的工作提供了一种通用的策略，可以引入首选的取向和界面改性，以增强卤化物钙钛矿薄膜和相关光电器件的晶体质量和稳定性。