Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China.
Institute of Advanced Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, P.R. China.
Nanoscale. 2016 Dec 1;8(47):19804-19810. doi: 10.1039/c6nr07450b.
The Lewis acid-base reaction between PbI and solvent molecules is popular in fabricating PbI films by a two-step method for making perovskite solar cells. Here, we control the microstructure of PbI films through modulating the Lewis acid-base reaction by adding a small amount of N-methyl pyrrolidone into PbI/DMF solution. PbI films with excellent crystallinity and full coverage are fabricated by spin-coating the mixed solution on the substrate, which leads to high quality perovskite layers with low recombination rate and high efficiency for carrier transfer. As a result, the power conversion efficiency of the best perovskite solar cells increases from 13.3% to 17.5%.
在两步法制备钙钛矿太阳能电池中，PbI 和溶剂分子之间的路易斯酸碱反应常用于制备 PbI 薄膜。在这里，我们通过在 PbI/DMF 溶液中加入少量 N-甲基吡咯烷酮来调节路易斯酸碱反应，从而控制 PbI 薄膜的微观结构。通过将混合溶液旋涂在基底上，制备出结晶度好、全覆盖的 PbI 薄膜，这导致具有低复合率和高效载流子转移的高质量钙钛矿层。结果，最佳钙钛矿太阳能电池的功率转换效率从 13.3%提高到 17.5%。
