Perovskite solar cells have attracted considerable attention owing to their easy and low‐cost solution manufacturing process with high power conversion efficiency. However, the fabrication process is usually performed inside a glovebox to avoid moisture, as organometallic halide perovskites are easily dissolved in water. In this study, we propose a one‐step fabrication of high‐quality MAPbI₃ perovskite films in around 50 % relative humidity (RH) humid ambient air by using diethyl ether as an antisolvent and methanol as an additive into this antisolvent. Because of the presence of methanol, the water molecules can be efficiently removed from the gaps of the perovskite precursors and the perovskite film formation can be slightly controlled, leading to pinhole‐free and low roughness films. Concurrently, methanol can be used to tune the DMSO ratio in the intermediate perovskite phase to regulate perovskite formation. Planar solar cells fabricated by using this method exhibited the best efficiency of 16.4 % with a reduced current density–voltage hysteresis. This efficiency value is approximately 160 % higher than the devices fabrication by using only diethyl ether treatment. From the impedance measurement, it is also found that the recombination reaction is suppressed when the device is prepared with methanol additive in the antisolvent. This method presents a new path for controlling the growth and morphology of perovskite films in humid climates and laboratories with uncontrolled environments.

中文翻译：

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甲醇添加剂在抗溶剂中的增强结晶作用，可在潮湿环境下获得高质量的MAPbI3钙钛矿薄膜。

钙钛矿太阳能电池由于其简便，低成本的解决方案制造工艺以及高功率转换效率而备受关注。然而，由于有机金属卤化物钙钛矿易于溶解在水中，因此制造过程通常在手套箱内进行以避免水分。在这项研究中，我们提出了一步制造高质量MAPbI _3的方法通过使用乙醚作为抗溶剂和甲醇作为该抗溶剂的添加剂，在大约50％相对湿度（RH）的潮湿环境空气中形成钙钛矿薄膜。由于存在甲醇，因此可以有效地从钙钛矿前体的间隙中除去水分子，并且可以稍微控制钙钛矿膜的形成，从而形成无针孔且低粗糙度的膜。同时，甲醇可用于调节钙钛矿中间相中的DMSO比例，以调节钙钛矿的形成。使用这种方法制造的平面太阳能电池在降低电流密度-电压滞后的情况下，显示出16.4％的最佳效率。该效率值比仅使用乙醚处理的器件制造高出约160％。根据阻抗测量，还发现当在抗溶剂中用甲醇添加剂制备装置时，重组反应受到抑制。该方法为控制潮湿环境和不受控制的环境中钙钛矿薄膜的生长和形貌提供了一条新途径。