biostudies-literatureJaffres AH2020 Marie Sklodowska-Curie Actions36557-36566https://www.ebi.ac.uk/biostudies/studies/S-EPMC11261561biostudies-literatureUnknown16(28)Up-scalable coating processes need to be developed to manufacture efficient and stable perovskite-based solar modules. In this work, we combine two Lewis base additives (N,N'-dimethylpropyleneurea and thiourea) to fabricate high-quality Cs_0.15FA_0.85PbI₃ perovskite films by blade-coating on large areas. Selected-area electron diffraction patterns reveal a minimization of stacking faults in the α-FAPbI₃ phase for this specific cesium-formamidinium composition in both spin-coated and blade-coated perovskite films, demonstrating its scaling potential. The underlying mechanism of the crystallization process and the specific role of thiourea are characterized by Fourier transform infrared spectroscopy and <i>in situ</i> optical absorption, showing cleaACS applied materials & interfacesBlade-Coating of High Crystallinity Cesium-Formamidinium Perovskite Formulations.PMC11261561945363Jaffres AOthman MHessler-Wyser ASaenz FBallif CWolff CMJeangros QfalseBlade-Coating of High Crystallinity Cesium-Formamidinium Perovskite Formulations.Up-scalable coating processes need to be developed to manufacture efficient and stable perovskite-based solar modules. In this work, we combine two Lewis base additives (N,N'-dimethylpropyleneurea and thiourea) to fabricate high-quality Cs_0.15FA_0.85PbI₃ perovskite films by blade-coating on large areas. Selected-area electron diffraction patterns reveal a minimization of stacking faults in the α-FAPbI₃ phase for this specific cesium-formamidinium composition in both spin-coated and blade-coated perovskite films, demonstrating its scaling potential. The underlying mechanism of the crystallization process and the specific role of thiourea are characterized by Fourier transform infrared spectroscopy and <i>in situ</i> optical absorption, showing clea2024-01-01T00:00:00Z2024 Jul2025-04-04T14:46:19.231Z2025-04-04T14:46:19.231ZS-EPMC112615613894953610.1021/acsami.4c04706