School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon, 440-746, Korea.
Adv Mater. 2018 Dec;30(49):e1802763. doi: 10.1002/adma.201802763. Epub 2018 Oct 10.
Photovoltaic technologies based on perovskite absorber materials have led this optoelectronic field into a brand-new horizon. However, the present antisolvents used in the one-step spin-coating method always encounter problems with the very narrow process window. Herein, anisole is introduced into the one-step spin-coating method, and the technology is developed to fabricate perovskite thin films with ultrawide processing window with a dimethylformamide (DMF):dimethyl sulfoxide (DMSO) ratio varying from 6:4 to 9:1 in the precursor solution, anisole dripping time ranging from 5 to 25 s, and an antisolvent volume varying from 0.1 to 0.9 mL. Perovskite thin films as large as 100 cm are successfully fabricated using this method. Maximum photoelectric conversion efficiencies of 19.76% for small-area (0.14 cm ) and 17.39% for large-area (1.08 cm ) perovskite solar cell devices are obtained. It is also found that there are intermolecular hydrogen-bonding forces between anisole and DMF/DMSO that play critical roles in the wide process window. These results provide a deeper understanding of the crystallizing procedure of perovskite during the one-step spin-coating process.
基于钙钛矿吸收材料的光伏技术将这一光电领域带入了一个全新的境界。然而，目前一步旋涂法中使用的反溶剂在非常窄的工艺窗口方面总是存在问题。在此，茴香醚被引入到一步旋涂法中，开发了这项技术来制备具有超宽加工窗口的钙钛矿薄膜，在前驱体溶液中，二甲基甲酰胺（DMF）与二甲基亚砜（DMSO）的比例从 6:4 变化到 9:1，茴香醚滴加时间从 5 秒到 25 秒，反溶剂体积从 0.1 毫升到 0.9 毫升。使用这种方法成功制备了尺寸达 100 厘米的钙钛矿薄膜。小面积（0.14 平方厘米）和大面积（1.08 平方厘米）钙钛矿太阳能电池器件的最大光电转换效率分别达到 19.76%和 17.39%。还发现茴香醚和 DMF/DMSO 之间存在分子间氢键，这些氢键在宽工艺窗口中起着关键作用。这些结果提供了对一步旋涂工艺中钙钛矿结晶过程的更深入理解。
