New Acidic Precursor and Acetone-Based Solvent for Fast Perovskite Processing via Proton-Exchange Reaction with Methylamine

• Published in: Molecules (Basel, Switzerland) Switzerland), 2020-04, Vol.25 (8), p.1856
• Main Authors: Fateev, Sergey A, Marchenko, Ekaterina I, Petrov, Andrey A, Goodilin, Eugene A, Tarasov, Alexey B
• Format: Article
• Language: English
• Subjects: Acetone; Acetone - chemistry; Acids; Aqueous solutions; Boiling points; Calcium Compounds - chemistry; Communication; Crystallization; Decomposition; hybrid perovskites; lead halide perovskites; lead precursor; Methylamine; Methylamines - chemistry; Oxides - chemistry; perovskite solar cells; Perovskites; Protons; Solubility; Solvents; Solvents - chemistry; Spectrum Analysis; Spin coating; Thin films; Titanium - chemistry; Viscosity
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules25081856

A new solvent system for PbI based on HI solution in acetone with a low boiling point is proposed. High solubility of PbI is caused by the formation of iodoplumbate complexes, and reaches a concentration of 1.6 M. Upon its crystallization metastable solvate phases PbI ∙HI∙n{(CH ) 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.