Tao Junlei, Wang Zhiwen, Wang Hongwei, Shen Jinliang, Liu Xiaoni, Xue Jingwei, Guo Hansong, Fu Guangsheng, Kong Weiguang, Yang Shaopeng
Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China.
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, China.
ACS Appl Mater Interfaces. 2021 Sep 22;13(37):44451-44459. doi: 10.1021/acsami.1c13136. Epub 2021 Sep 10.
The high density of defects in MAPbI perovskite films brings about severe carrier nonradiative recombination loss, which lowers the performance of MAPbI-based perovskite solar cells (PSCs). Here, methylamine cyanate (MAOCN) molecules were introduced into MAPbI solutions to manipulate the crystallizatsion of the MAPbI films. MAOCN molecules can slow down the volatilization rate of the solvent and delay the crystallization process of the MAPbI film. The crystal quality of the MAPbI films is effectively optimized without an additive residue. Perovskite films treated by MAOCN have lower defect density and longer carrier lifetime, which lowers the carrier recombination loss. Meanwhile, the MAPbI film based on MAOCN has a more hydrophobic surface. The final MAPbI-based device efficiency reached 21.28% ( = 1.126 V, = 23.29 mA/cm, and FF = 81.13). After 30 days of storage under atmospheric conditions, the efficiency of unencapsulated MAOCN-based PSCs only dropped by about 5%.
MAPbI钙钛矿薄膜中的高密度缺陷会导致严重的载流子非辐射复合损失,这降低了基于MAPbI的钙钛矿太阳能电池(PSC)的性能。在此,将甲胺氰酸盐(MAOCN)分子引入到MAPbI溶液中以控制MAPbI薄膜的结晶过程。MAOCN分子可以减缓溶剂的挥发速率并延迟MAPbI薄膜的结晶过程。MAPbI薄膜的晶体质量在没有添加剂残留的情况下得到有效优化。经MAOCN处理的钙钛矿薄膜具有更低的缺陷密度和更长的载流子寿命,这降低了载流子复合损失。同时,基于MAOCN的MAPbI薄膜具有更疏水的表面。最终基于MAPbI的器件效率达到21.28%( = 1.126 V, = 23.29 mA/cm,填充因子FF = 81.13)。在大气条件下储存30天后,未封装的基于MAOCN的PSC的效率仅下降了约5%。