Organometallic halide perovskite absorption layer with excellent surface morphology and large grain size is very important for fabricating efficient perovskite solar cells (PSCs). The antisolvent assisted crystallization (ASAC) has been proved to be an effective tactic to prepare compact and uniform polycrystalline perovskite film. However, most of the antisolvents currently used are highly toxic, and the perovskite crystallization process is difficult to control using pure antisolvent. Here, a green strategy is developed to improve the nucleation kinetics of perovskite precursor and the perovskite crystallization process. A mixed green antisolvent of ethyl acetate (EA)/petroleum ether (PE) is employed to regulate the crystallization of perovskite and replace traditional chlorobenzene (CB) and pure EA. With optimized proportion of EA and PE, the supersaturation degree is controlled via reducing the solvent evaporation rate and the nucleation rate, and it is good for crystal growth. Moreover, the grain growth rate and grain size are easily regulated, which contribute to the uniform, large grain and non-pinhole perovskite film. Correspondingly, the intrinsic perovskite solar cells based on CH₃NH₃PbI₃ achieve a power conversion efficiency of 17.19% and an average efficiency of 16.25% (std 0.43).

具有优异的表面形态和较大晶粒尺寸的有机金属卤化物钙钛矿吸收层对于制造有效的钙钛矿太阳能电池（PSC）非常重要。已经证明，抗溶剂辅助结晶（ASAC）是制备致密且均匀的多晶钙钛矿薄膜的有效策略。但是，目前使用的大多数抗溶剂都具有高毒性，钙钛矿的结晶过程很难用纯抗溶剂控制。在这里，开发了一种绿色策略来改善钙钛矿前体的成核动力学和钙钛矿的结晶过程。乙酸乙酯（EA）/石油醚（PE）的混合绿色抗溶剂用于调节钙钛矿的结晶，并代替传统的氯苯（CB）和纯EA。通过优化EA和PE的比例，通过降低溶剂蒸发速率和成核速率来控制过饱和度，这对于晶体生长是有利的。此外，晶粒生长速率和晶粒尺寸易于调节，这有助于形成均匀，大晶粒和无针孔的钙钛矿薄膜。相应地，基于CH的固有钙钛矿太阳能电池₃ NH ₃ PbI ₃的功率转换效率为17.19％，平均效率为16.25％（std 0.43）。