Commercializing perovskite-based tandems necessitates environmentally friendly solvents for scalable fabrication of efficient wide-bandgap (WBG) (1.65–1.80 eV) perovskites. However, the green solvents developed for formamidinium lead iodide-based ~1.50-eV-bandgap perovskites are unsuitable for WBG perovskites due to the low solubility of caesium and bromide salts, leading to reliance on toxic N,N-dimethylformamide solvent. Here we present a green solvent system comprising dimethyl sulfoxide and acetonitrile to effectively dissolve the named salts, with the addition of ethyl alcohol to prevent precursor degradation and to extend the solution processing window. Using this green solvent mixture, we achieve blade-coated WBG perovskite solar cells with power conversion efficiencies of 19.6% (1.78 eV) and 21.5% (1.68 eV). We then demonstrate 20.25-cm² all-perovskite tandem solar modules with a power conversion efficiency of 23.8%. Furthermore, we achieved WBG perovskites deposited in ambient air and narrow-bandgap perovskites fabricated using the same green solvents, which promotes the viability of environmentally friendly fabrication.

基于钙钛矿的串联体的商业化需要环保溶剂来可扩展制造高效的宽带隙 （WBG） （1.65–1.80 eV） 钙钛矿。然而，由于铯和溴化物盐的溶解度低，为基于甲脒的碘化铅基 ~1.50-eV 带隙钙钛矿开发的绿色溶剂不适用于 WBG 钙钛矿，导致依赖有毒的 N，N-二甲基甲酰胺溶剂。在这里，我们提出了一种由二甲基亚砜和乙腈组成的绿色溶剂体系，可有效溶解指定的盐类，并添加乙醇以防止前驱体降解并延长溶液处理窗口。使用这种绿色溶剂混合物，我们实现了叶片涂层的 WBG 钙钛矿太阳能电池，功率转换效率为 19.6% （1.78 eV） 和 21.5% （1.68 eV）。然后，我们展示了 20.25 cm² 全钙钛矿叠层太阳能组件，功率转换效率为 23.8%。此外，我们实现了沉积在环境空气中的 WBG 钙钛矿和使用相同的绿色溶剂制造的窄带隙钙钛矿，这促进了环保制造的可行性。