It is verified that the interface engineering is an effective way to achieve highly efficient and stable perovskite solar cells. However, the typical interface engineering of using insulating polymer or metal oxide to fabricate tunneling layers has an obvious drawback that is their thickness must be exactly controlled (usually <2 nm), thinner or thicker film will not bring positive effects on the photovoltaic performance of the device. Here we report the fabrication of efficient and stable planar perovskite solar cells by interface engineering with p-type NiO nanocrystals. It is found that the photovoltaic performance of the devices is not so sensitive to the thickness of NiO thin films. The champion planar perovskite solar cell with a NiO thin film in the interface of perovskite/spiro-OMeTAD can achieve a high efficiency of 19.89% and a high steady-state power output of 19.37 mW cm⁻², being attributed to the significantly suppressed radiative recombination and eliminated charge accumulation. Moreover, the device shows excellent stability because its efficiency can retain 94.40% of the initial value after 400 h measurement in an air environment with 50 ± 5% relative humidity. Therefore, this work supplies an easy way to implement interface engineering for boosting both efficiency and stability of perovskite solar cells.

事实证明，界面工程是实现高效稳定的钙钛矿太阳能电池的有效途径。但是，使用绝缘聚合物或金属氧化物制造隧穿层的典型界面工程具有明显的缺点，即必须精确控制其厚度（通常<2 nm），更薄或更厚的膜不会对光伏电池的光伏性能产生积极影响。设备。在这里，我们报告通过与p型NiO纳米晶体的界面工程来制造高效且稳定的平面钙钛矿太阳能电池。发现器件的光电性能对NiO薄膜的厚度不太敏感。钙钛矿/螺-OMeTAD界面中具有NiO薄膜的冠军平面钙钛矿太阳能电池可实现19的高效率。^－2归因于显着抑制的辐射复合和消除的电荷积累。此外，该器件具有出色的稳定性，因为在相对湿度为50±5％的空气环境中进行400 h测量后，其效率可以保持初始值的94.40％。因此，这项工作提供了一种简便的方法来实施接口工程，以提高钙钛矿太阳能电池的效率和稳定性。