Fig. 1From: Sequentially Vapor-Grown Hybrid Perovskite for Planar Heterojunction Solar Cellsa Schematic illustration of the fabrication process, via PbCl2 evaporation, MAI vaporization and diffusion, and post-annealing. b UV-Vis absorption spectra of the PbCl2 and perovskite layers. Corresponding sample photographs are given in insetBack to article page