Interface engineering is of great signification for high-performance of organic–inorganic halide perovskite solar cells (PSCs). Herein, we report a dual interface modification strategy for constructing effective and stable PSCs by simultaneously incorporating the europium ions doped WO_x nanorods (Eu-WO_x) into electron transport layer (ETL) and hole transport layer (HTL). A significant hysteresis-free power conversion efficiency (PCE) with 22.08%, and much better UV light/long term-stability of PSCs are achieved as compared to 19.03% for the reference one. Systematic investigations elucidate that Eu-WO_x nanorods significantly contribute to the improved conductivity, carrier mobility of both SnO₂ ETL and Spiro-OMeTAD HTL, and the crystalline quality of the perovskite film with the large grain size. Meanwhile, because of the perfect energy band alignment of Eu-WO_x nanorods, the electrons/holes extraction efficiencies at perovskite/ETL and perovskite/HTL interfaces in PSCs are remarkably boosted. This finding highlights that Eu-WO_x nanorods as the interface modifier provide a versatile avenue to construct efficient and stable PSCs for practical applications.

界面工程对于高性能有机-无机卤化物钙钛矿太阳能电池（PSC）具有重要意义。在这里，我们报告了通过同时掺入掺有WO离子的WO _x纳米棒（Eu-WO _x）到电子传输层（ETL）和空穴传输层（HTL）中来构建有效和稳定的PSC的双界面修饰策略。与参考文献中的19.03％相比，PSC的无磁滞功率转换效率（PCE）显着提高，达到22.08％，并且具有更好的紫外线/ PSC长期稳定性。系统研究表明，Eu-WO _x纳米棒显着有助于改善SnO _2的电导率和载流子迁移率ETL和Spiro-OMeTAD HTL，以及具有大晶粒尺寸的钙钛矿薄膜的结晶质量。同时，由于Eu-WO _x纳米棒的完美能带排列，显着提高了PSC中钙钛矿/ ETL和钙钛矿/ HTL界面的电子/空穴提取效率。这一发现突出表明，作为界面改性剂的Eu-WO _x纳米棒为构建适用于实际应用的高效稳定的PSC提供了一条通用途径。