Fig. 4From: Efficiency Enhancement of Perovskite Solar Cells by Pumping Away the Solvent of Precursor Film Before AnnealingSEM images of MAPbI3 − x Cl x perovskite layers prepared by a annealing the precursor film directly and b annealing the precursor film after pumping away the solvent. c UV-vis absorption spectra of MAPbI3 − x Cl x perovskites prepared by either annealing the precursor film directly or annealing the precursor film after pumping away the solventBack to article page