Wu Jian, Dong Jing-Jing, Chen Si-Xuan, Hao Hui-Ying, Xing Jie, Liu Hao
School of Science, China University of Geosciences, Beijing, 100083, China.
Nanoscale Res Lett. 2018 Sep 21;13(1):293. doi: 10.1186/s11671-018-2714-z.
Although many groups have been trying to prepare perovskite solar cells (PSCs) in ambient air, the power conversion efficiency (PCE) is still low. Besides, the effect of moisture on the formation of perovskite films is still controversial. In this paper, we studied the effect of moisture on the formation of perovskite films in detail, and found that moisture can speed up the crystallizing process of PbI films to form poor-quality films with large grain size and surface roughness, while, for the conversion of PbI to perovskite films, a small amount of moisture is not adverse, and even beneficial. On this basis, we report the successful fabrication of efficient mesoporous PSCs with PCE of 16.00% under ambient air conditions at 25% relative humidity by adding a small amount of n-butyl amine into the solution of PbI to enhance the quality of PbI films and thus to achieve high-quality perovskite films with smooth surface, large crystal grains, and high crystal quality.
尽管许多研究团队一直试图在环境空气中制备钙钛矿太阳能电池（PSC），但其功率转换效率（PCE）仍然很低。此外，水分对钙钛矿薄膜形成的影响仍存在争议。在本文中，我们详细研究了水分对钙钛矿薄膜形成的影响，发现水分可以加速PbI薄膜的结晶过程，形成具有大晶粒尺寸和表面粗糙度的质量较差的薄膜，而对于PbI向钙钛矿薄膜的转化，少量水分并无不利影响，甚至是有益的。在此基础上，我们报告了通过在PbI溶液中添加少量正丁胺以提高PbI薄膜质量，从而在25%相对湿度的环境空气条件下成功制备出功率转换效率为16.00%的高效介孔PSC，进而获得具有光滑表面、大晶粒和高晶体质量的高质量钙钛矿薄膜。
