US 2026/0200838 A1 · METHODS OF MAKING FORMAMIDINIUM LEAD IODIDE

Abstract

The present disclosure relates to methods for making formamidinium lead iodide (FAPbI3). The methods comprise preparing a reaction mixture in various ways, including: (i) preparing a lead(ii) iodide suspension, wherein at least 90% of lead(ii) iodide is not dissolved and remains in solid state, followed by introducing formamidinium iodide to the suspension; (ii) mixing lead(ii) iodide and formamidinium iodide, followed by heating and cooling the solid mixture, which is then used to form a suspension with a liquid; or (iii) mixing a first precursor, which contains lead(ii) ions; a second precursor, which contains formamidinium ions; a third precursor, which contains iodide ions; and a liquid. The methods further comprise of heating the reaction mixture to a temperature greater than or equal to 40° C. and less than or equal to 190° C., followed by isolating formamidinium lead iodide product from the supernatant, and washing the product with a liquid.

Claims18

Dependent claims

A method for making formamidinium lead iodide, comprising the steps of:

(1a) preparing a suspension of lead(ii) iodide in a liquid S1, wherein at least 90% of lead(ii) iodide is not dissolved and remains in solid state;
(1b) introducing formamidinium iodide to the suspension to form a reaction mixture, wherein the reaction mixture is a suspension;
(1c) heating the reaction mixture to a temperature greater than or equal to 40° C. and less than or equal to 190° C.;
(1d) isolating formamidinium lead iodide product by separating the solid from the supernatant;
and
(1e) washing the formamidinium lead iodide product with a liquid S2 .

3 more elements

Dependencies are inferred from the claim text.

Methods of making formamidinium lead iodide

Life of this patent

Methods of making formamidinium lead iodide

Life of this patent

Abstract

Claims18