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The advent of halide perovskite permitted significant progress in the field of III generation photovoltaics (PV), demonstrating a rapid growth of power conversion efficiency (PCE) up to 25.5% during the last decade. [1] This is mainly due to the peculiar properties of halide perovskites for photoelectric conversion: strong absorption in the visible region of the solar light spectrum, [2] defect tolerance, [3] big diffusion lengths of the charge carriers (>1 mm), [4] and tunability of the bandgap in the wide range (from 1.9 to 3.1 eV). [5] The improvement of perovskite solar cell (PSC) performance has been mainly driven by solution processing of the absorber films that allows simplifying the device fabrication at low temperature [6,7] by using various methods for the perovskite crystallization [8] and the control of morphology. [9] The cost-effective solution-based fabrication of the PSCs could be realized with various printing methods such as blade coating, [10,11] inkjet printing, [12] and slot-die, [13] which do not require the use of high vacuum and provide high throughput speed of production. Among the printing methods, the slot-die coating was considered as one of the most promising for upscale of the PSCs in sheetto-sheet and roll-to-roll fabrication. [13][14][15] This method of wet coating provides a high speed and large-area fabrication, [16] good film thickness control, highly uniform coating, and enables the effective ink consumption without materials loss during the deposition. [17,18] The upscaling of PSCs from lab-scale to large modules with an application of printing methods is a complex technological process that requires special fabrication conditions, including

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