| Summary: | A new solvent system for PbI<sub>2</sub> based on HI solution in acetone with a low boiling point is proposed. High solubility of PbI<sub>2</sub> is caused by the formation of iodoplumbate complexes, and reaches a concentration of 1.6 M. Upon its crystallization metastable solvate phases PbI<sub>2</sub>∙HI∙n{(CH<sub>3</sub>)<sub>2</sub>CO} are formed. The latter allows for their easy deposition on substrates in a form of smooth and uniform thin films by spin-coating. Through a fast acid-base reaction with a gaseous amine, the films of the intermediate phase can be completely converted to single-phase perovskite films. The developed method allows one to form smooth perovskite films with high crystallinity with a thickness up to 1 μm. Due to easy and fast processing, the developed method can be promising for perovskite technology upscaling.
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