Compare the Different Antisolvents on Perovskite Films in Ambient Atmosphere
High-efficiency perovskite solar cells (PSCs) need to be fabricated in the nitrogen-filled glove box by the atmosphere-controlled crystallization process. In this work, we find that simply preheating the substrate and PbI2 solution a fully covered and uniform PbI2 film deposited in air can be obtained. This is due to the increased vapor pressure of the solvent at higher temperatures to reduce the ingress of oxygen and moisture during the PbI2 deposition. In another work, notable efficient perovskite solar cells can be obtained in high humidity ambient atmosphere (70% humidity) by using acetate as the antisolvent, in which dependence of methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), butyl acetate (BA), Ether, Toluene and Chlorobenzene (CB) on the crystal growth mechanism is discussed. The function of the antisolvent is to remove the high boiling point solvent DMF and form a transparent intermediate adduct (MAI−PbI2−DMSO) from its perovskite precursor solution, which leads to a smooth, pinhole-free, and homogenous perovskite film with high electronic properties.
Keywords - Perovskite Solar Cells, Acetate, Antisolvent, Perovskite Intermediate Phase, Ambient Atmosphere