perovskites remains one of the main challenges, adding risk to the long-term reliability of these devices. [3] Recently, perovskite compositions, which induce structures of reduced dimensionality, were reported as an interesting family of compounds, exhibiting promising environmental stability and effective photovoltaic performance parameters. [4,5] Within that category, Ruddlesden-Popper perovskite types were most often used in thin-film solar cells. Such layered structures, also referred to as quasi-2D perovskites, are described by the empirical formula of (LC) 2 (SC) n−1 Pb n I 3n+1 , where LC is a cation with a large ionic radius (usually an aromatic or aliphatic alkyl ammonium halide), SC is a small cation (typically, methylammonium -MA + , or formamidinium -FA + ), and n is the number of confined lead halide octahedral layers. [5] When the perovskite film is processed from a precursor solution, bulky cations organize in a specific way, separating the 3D-like phases, and forming a layered structure. The unique arrangement of the lattice brings certain properties, which can be further tuned with appropriate compositional engineering. [6][7][8] Many compounds of different chain lengths and chemical structures were found to fit the role of the bulky cation. [9,10] Commonly, these large organic cations provide hydrophobic character, enhancing the water resistance of the perovskite layers. [11] The large cation can also passivate various electronic defects in the perovskite structure, and limit ion migration, which in turn provides better photostability. [12] As a result, the quasi-2D perovskites provide an interesting avenue for reaching improved structural robustness and enhanced operational stability when compared to the more conventional 3D counterparts, making them particularly suitable for terrestrial applications. As the large organic cation is electrically insulating, the orientation of perovskite grains needs to be carefully adjusted. In order to enable efficient charge carrier transport through the photoactive layer, low dimensional perovskite sheets need to be oriented perpendicularly to the substrate. [13] Various strategies of inducing preferential vertical alignment of 2D perovskite crystallites have been explored, including coordinating additives, or specific processing conditions, inducing preferential dynamics of the initial crystallization stages. [14,15] Recent advancements in this topic resulted in PCEs exceeding 20%, highlighting the large application potential for these materials. [16] Metal halide perovskites of reduced dimensionality constitute an interesting subcategory of the perovskite semiconductor family, which attract a lot of attention, primarily due to their excellent moisture resistance and peculiar optoelectronic properties. Specifically, quasi-2D materials of the Ruddlesden-Popper (RP) type, are intensely investigated as photoactive layers in perovskite solar cells. Here, a scalable deposition of quasi-2D perovskite thin films, with a nominal composition of 4F-PEA 2 MA 4 Pb 5 I ...