For scalable perovskite solar cells (PSCs), depositing a homogeneous and high-quality perovskite film over a large area (>100 cm²) is essential. Traditional spin-coating solutions, suitable for small areas, often use polar aprotic solvents with high boiling points. However, these are not ideal for large-area bar coating due to their slow and uncontrollable drying process caused by strong interactions with Lewis acidic PbI2 or perovskite. Therefore, the precursor solution is crucial for successful large-area coating. This study presents a coating solution suitable for large-area perovskite films. Prepared via gas-mediated solid-liquid conversion, these solutions contain preformed perovskite clusters, as confirmed by the rotational mode of methylammonium cation in the PbI3– framework from Raman spectroscopy. D-bar coating of CH3NH3PbI3 (MAPbI3) films within 20 seconds over areas larger than 100 cm² resulted in films exhibiting a tetragonal/cubic superlattice structure with highly preferred orientation. This method achieved an average power conversion efficiency (PCE) of 17.01% and a best PCE of 17.82%. -Scientific Journal cover design by scapiens
[Scientific Journal cover design] Low-Thermal-Budget Fluorite-Structure Ferroelectrics for Future Electronic Device Applications
In article number 2100028, Jiyoung Kim, Si Joon Kim, and their team review key factors involved in developing fluorite-structure ferroelectrics
