Fig. 2From: Perovskite Solar Cells Based on Compact, Smooth FA0.1MA0.9PbI3 Film with Efficiency Exceeding 22%Top view SEM images of MAPbI3 (a) and FA0.1MA0.9PbI3 (b). Photoluminescence (PL) spectra of standard and modified perovskite on glass substrates. c Time-resolved photoluminescence (TRPL) spectra of both standard and modified perovskite films (d)Back to article page