Competing formation of α and δ-FAPbI3 in perovskite ink using 2-methoxyethanol as the solvent
Abstract
2-Methoxyethanol (2 -Me) is a promising solvent for large -area perovskite film preparation. Understanding the competing processes of alpha and 8-FAPbI3 in 2 -Me is crucial for advancing the application of 2 -Me in FAPbI3 film coating. In this study, FAPbI3 microcrystals are fabricated by inverse temperature crystallization method at 100 degrees C, and are used as a platform to investigate the competing formation of alpha and 8-FAPbI3 in 2 -Me. Perovskite inks are analyzed using Raman, FTIR and DLS, and it is found that cluster ratio is closely related to the kinetic formation of 8-FAPbI3. The formation of alpha-FAPbI3 can be significantly promoted when clusters are dissociated with additives (excess FAI or I2). These findings provide valuable insights into the influence of precursor inks on perovskite phases.