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One of the major bottlenecks of perovskite photovoltaic modules fabrication is the homogeneous deposition of perovskite material on large-area substrates. Here, we show that slot-die coating technique combined with synergistic gas quenching and substrate heating can produce compact, homogenous and reproducible Cs 0.16 FA 0.84 Pb(I 0·88 Br 0.12) 3 perovskite films. We demonstrate the fabrication of perovskite solar cells (PSCs) in a planar (n-i-p) device configuration and attain power conversion efficiency (PCE) of 18% over 0.09 cm2 device active area. The versatility of this crystallization strategy, which eliminates the need for complex solvents or additive engineering, was studied using planar SnO 2 - and TiO 2 -coated FTO substrates. Our study provides greater insights into achieving controlled coating and homogeneous crystallization of perovskite films over large-area substrates (~10 × 10 cm2) necessary for the commercialization of this technology. • We report the slot-die coating of methylammonium free perovskite layers via synergistic gas quenching over large areas. • The perovskite films were deposited homogeneously over 100 cm2 substrates. • 30 devices were fabricated from the same substrate and the power conversion efficiency showed reproducibility, with an average of 16.35 ± 2%. • The unencapsulated devices exhibited a T 80 of 700 h. [ABSTRACT FROM AUTHOR]