We demonstrate the flexible and facile use of porous PbI2 layers to fabricate high quality perovskite films with a dense surface and without residual PbI2. PbI2 precursor solutions by adding polystyrene pore-forming agents are first spin-coated to fabricate the wet film. A porous PbI2 layer is formed by washing off polystyrene using organic solvents. The porous PbI2 layer not only serves as a channel for transporting the CH3NH3I solution but also offers extremely enlarged contact areas, facilitating interfacial reaction with CH3NH3I. Shiny smooth perovskite films with excellent electronic quality and solar cells with an efficiency up to 17% are obtained.
Improved perovskite morphology and crystallinity using porous PbI2 layers for efficient planar heterojunction solar cells
Xianyu Jia, Ziyang Hu, Jie Xu, Like Huang, Jing Zhang, Jianjun Zhang, Yuejin Zhu; Improved perovskite morphology and crystallinity using porous PbI2 layers for efficient planar heterojunction solar cells. Appl. Phys. Lett. 11 December 2017; 111 (24): 243902. https://doi.org/10.1063/1.5012135
Download citation file: