Enhanced efficiency and stability of perovskite solar cells by synergistic effect of magnesium acetate introducing into CH3NH3PbI3

High quality of perovskite film is considered as one of the most important factors on the photovoltaic properties in the perovskite solar cell (PSC). In this work, the magnesium acetate (MgAc 2 ) is first used as an effective additive to prepare high quality perovskite film through a synergistic effect Mg 2+ and Ac − , in which the Mg 2+ can enhance the conversion from PbI 2 to complete perovskite and the Ac − can adjust the crystallization rate to prepare dense and smooth perovskite film. Moreover, the Mg 2+ and Ac − can induce the trap states passivation of lead and iodide ions to reduce the charge recombination, which is critical to keep the high photovoltaic performance of perovskite films. As a result, the PSC with MgAc 2 shows higher efficiency and stability than those of the PSC without MgAc 2 .