Ink engineering increases the quality and uniformity of large-scale perovskite films for efficient inkjet-printed perovskite solar cells (IJP-PSCs). The absorber layer in PSCs must be pinhole- and crack-free, highly uniform, with minimum defects, and have better optoelectronic properties, to improve PSC device performance. Herein, a different strategy, such as solvents with high boiling points (BPs), is used to modify the perovskite inks to obtain uniform and better-quality IJP-perovskite films. The perovskite film prepared with a 1,3-dimethyl-2-imidazolidinone (DMI) solvent is highly uniform (>96 %), thicker, with a smoother surface, and contains bigger grains than γ-butyrolactone (GBL) based IJP-perovskites. The DMI solvent-based IJP-PSC device shows a greater than 17.5 % power conversion efficiency (PCE), which is much higher than that possible with GBL-based devices (PCE ∼13.8 %). The better performance of the IJP-PSC device is mainly due to the film’s uniformity, large grains, and well-formed structures, which reduce the occurrence of specific chemical reactions within the perovskite material. The presented ink engineering strategy to develop highly uniform IJP perovskite films has the potential to be applied to perovskite solar modules.

中文翻译：

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使用 1,3-二甲基-2-咪唑烷酮溶剂的油墨工程用于高效的喷墨打印三阳离子钙钛矿太阳能电池


油墨工程提高了高效喷墨打印钙钛矿太阳能电池 （IJP-PSC） 的大规模钙钛矿薄膜的质量和均匀性。PSC 中的吸收层必须无针孔和裂纹、高度均匀、缺陷最小，并具有更好的光电性能，以提高 PSC 器件的性能。在此，使用不同的策略，例如具有高沸点 （BP） 的溶剂，用于改性钙钛矿油墨，以获得均匀且质量更好的 IJP-钙钛矿薄膜。用 1,3-二甲基-2-咪唑烷酮 （DMI） 溶剂制备的钙钛矿薄膜高度均匀 （>96 %），更厚，表面更光滑，并且比 γ-丁内酯 （GBL） 基 IJP 钙钛矿含有更大的颗粒。DMI 溶剂型 IJP-PSC 器件的功率转换效率 （PCE） 大于 17.5%，远高于基于 GBL 的器件 （PCE ∼13.8 %）。IJP-PSC 器件的更好性能主要是由于薄膜的均匀性、大晶粒和形状良好的结构，这减少了钙钛矿材料内特定化学反应的发生。所提出的开发高度均匀的 IJP 钙钛矿薄膜的油墨工程策略有可能应用于钙钛矿太阳能组件。