It is an objective of the invention to provide a method that allows producing perovskite solar cells that have high stability and high conversion efficiency, thereby producing solar cells that are overall competitive.

The present invention addresses the problems depicted above and further problems as become apparent from the disclosure below.

Remarkably, the present inventors provide a perovskite precursor ink that exhibits high stability at room temperature (25° C.) and that makes it possible to deposit organic-inorganic perovskite with high precision, high reproducibility and obtaining solar cells having surprising performance and stability.

In an aspect, the present invention provides method for depositing at least part of perovskite, the method comprising the step of depositing a perovskite precursor solution comprising a compound suitable to slowing down the precipitation and/or crystal growth of said perovskite.

In an aspect, the invention provides a method for depositing at least part of an organic-inorganic perovskite, the method comprising the step of depositing a perovskite precursor solution comprising one or more organic cation, wherein said precursor solution is deposited by depositing the ink through a printing nozzle. In an embodiment, said precursor solution is deposited by inkjet printing.

In an aspect, the invention provides the use of a compound for slowing down the nucleation and/or crystallization process of a perovskite in a perovskite precursor solution. In an aspect, the invention provides the use of a compound for reducing and/or slowing down nucleation and/or precipitation of perovskite or perovskite intermediates in an inkjet ink comprising an organic-inorganic perovskite precursor solution.