Method for synthesis of organic iodides, a perovskite-forming composition comprising an organic iodide and a photovoltaic cell with a perovskite layer obtained therefrom

Abstract

A method for obtaining a salt with a general formula: RNI, wherein: RN is an organic cation (RN), R represents substituents (R—) independently selected from a group consisting of organic substituents: R—, R—, R— and hydrogen (H—), x is a number of the substituents R— directly linked with the nitrogen (N) atom in the organic cation RN, wherein x is 3 or 4, I is an iodide anion (I). The method comprises: preparing a reaction mixture comprising the steps of: synthesizing hydrogen iodide (HI) in situ by mixing molecular iodine (I) with formic acid (COOH) in a molar ratio of molecular iodine (I): formic acid (COOH) of no less than 1.01:1, in a solvent medium, introducing into the solvent medium a compound being a donor of organic cation RNin an amount providing the molar ratio of the donor of organic cation RN: molecular iodine (I) of no less than 1.01:1, and maintaining the reaction mixture at a temperature of not less than 20° C. for the time necessary to obtain the reaction product being the salt with the general formula RNI. The obtained product is a substrate for synthesis of perovskites.