Organic-inorganic hybrid perovskite solar cells (PSCs), due to their high power conversion efficiency (PCE) and low cost, have been considered as one of the most promising photovoltaic devices. Well-distributed large-grain perovskite crystals play an important role for light adsorption and charge transfer. While, high quality perovskite crystals closely relate to the preparation method. Generally, the preparation of perovskite films requires a nitrogen atmosphere and toxic anti-solvents, which hinder their practical applications. Here, we reported a novel and simple solution evaporation process followed with a methylammonium iodide (MAI) solution immersion to prepare high quality perovskite films. Porous lead iodide (PbI₂) films were firstly formed by evaporation of PbI₂ precursor solution. The obtained porous PbI₂ films were completely transformed into well-distributed large-grain perovskite films after a quick MAI solution immersion. As a result, the corresponding PCE was enhanced by 30% compared to that prepared with a regular sequential deposition. This solution evaporation method provides a convenient and practical way for preparing high-quality perovskite films.

有机-无机杂化钙钛矿太阳能电池（PSC）由于其高功率转换效率（PCE）和低成本，被认为是最有前途的光伏器件之一。分布均匀的大晶粒钙钛矿晶体对光吸收和电荷转移起着重要作用。而高质量的钙钛矿晶体与制备方法密切相关。一般来说，钙钛矿薄膜的制备需要氮气气氛和有毒的反溶剂，这阻碍了它们的实际应用。在这里，我们报道了一种新颖而简单的溶液蒸发工艺，然后浸入甲基碘化铵 (MAI) 溶液以制备高质量的钙钛矿薄膜。多孔碘化铅 (PbI ₂ ) 薄膜首先通过蒸发 PbI _2形成前体溶液。获得的多孔PbI ₂薄膜在快速MAI溶液浸泡后完全转变为分布良好的大晶粒钙钛矿薄膜。结果，与使用常规顺序沉积制备的 PCE 相比，相应的 PCE 提高了 30%。这种溶液蒸发法为制备高质量的钙钛矿薄膜提供了一种方便实用的方法。