Patent ID: 11964995
Assignee: BROWN UNIVERSITY
Field: Organic fine chemistry (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 11:
12. A method of making a perovskite, the method comprising:
combining a stoichiometric amount of at least one perovskite precursor comprising cesium, formamidinium (FA), tin, and at least one of iodide or X resulting in a mixture;
adding an additive to the mixture; and
treating the mixture, wherein:
the treating results in forming a perovskite layer having a stoichiometry comprising Cs1-xFAxSn1-yPby(I1-zXz)3,
the perovskite layer has an average grain size of 865 nm±360 nm,
X is a halide other than iodide,
0.5≤x≤0.9, 0.5≤y≤1, 0.9, 0≤z≤1, and
the additive comprises FA and tin and at least one of fluoride or chloride.