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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.

article Article
date_range 2024
language English
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Featured Keywords

FAPbI 3
2-Methoxyethanol
Microcrystals
Clusters
Competing phases
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