Process for the formation of a perovskite layer in particular for a photovoltaic cell

A method for forming a perovskite layer on a carrier substrate, comprising:

• mixing a solution which contains a first and a second perovskite precursor at a mixing temperature,
• applying the solution to the carrier substrate,
• moving the carrier substrate together with the applied solution in a two-dimensional movement, wherein the carrier substrate is successively displaced transversely in different directions and/or rotated or pivoted rotationally about different axes, and simultaneously cooling the carrier substrate together with the applied solution to a deposition temperature below the mixing temperature in order to produce a deposited layer which contains both the first and the second perovskite precursor and/or a reaction product from the two perovskite precursors on the carrier substrate.