One-step method assisted by antisolvent is the most useful strategy to fabricate perovskite solar cells (PSCs) with high power conversion efficiency (PCE). Nevertheless, the narrow processing window and strict solvent ratio limit the preparation of large-area and uniform perovskite films. Herein, by thorough in-depth study of the interaction between solvents and antisolvents in the film preparation process, we found that the typical dimethylformamide solvent plays an important role in the antisolvent washing process. We demonstrate a solvent-antisolvent interaction model to understand the originality of the narrow processing window and solvent ratio based on chlorobenzene. Here, a green antisolvent ─ Ethyl Methyl Carbonate is introduced to widen a processing window from 2s to 35s and extend the volume ratio of dimethylformamide: dimethyl sulfoxide varying from 7:3 to 0:10 in the precursor solution. The obtained PSCs show a remarkable efficiency of 22.08% on rigid substrates, and 19.14% on flexible substrates. In a parallel effort, we demonstrate a uniform and large-area (6 × 6 cm²) flexible perovskite solar cell, exhibiting the highest PCE of 18.60%.

由反溶剂辅助的一步法是制造具有高功率转换效率 (PCE) 的钙钛矿太阳能电池 (PSC) 的最有用策略。然而，狭窄的加工窗口和严格的溶剂比限制了大面积均匀钙钛矿薄膜的制备。在此，通过对成膜过程中溶剂与反溶剂相互作用的深入研究，我们发现典型的二甲基甲酰胺溶剂在反溶剂洗涤过程中起着重要作用。我们展示了一个溶剂-反溶剂相互作用模型，以了解基于氯苯的窄加工窗口和溶剂比的独创性。在这里，引入了一种绿色抗溶剂——乙基碳酸甲酯，将加工窗口从2s扩大到35s，并扩大了二甲基甲酰胺的体积比：前体溶液中的二甲基亚砜从 7:3 到 0:10 不等。所获得的 PSC 在刚性基板上显示出 22.08% 的显着效率，在柔性基板上显示出 19.14% 的显着效率。在平行的努力中，我们展示了一个均匀的大面积（6 × 6 cm² ) 柔性钙钛矿太阳能电池，PCE 最高，为 18.60%。