Method for obtaining a substrate coated with a functional layer by using a sacrificial layer

A process for obtaining a material comprising a substrate coated on at least one part of at least one of its faces with at least one functional layer, the process comprising:

• heat treating, with radiation, a coated substrate that comprises a substrate, the at least one functional layer deposited on the substrate, and a sacrificial layer deposited on the at least one functional layer, thereby heating the at least one functional layer and the sacrificial layer, wherein the radiation is laser radiation or radiation from at least one flash lamp, the radiation having at least one treatment wavelength between 200 and 2500 nm, the sacrificial layer being in contact with the air during the heat treating;
• and then
• removing the sacrificial layer by contacting with a solvent, thereby obtaining the substrate coated on at least one part of at least one of its faces with the at least one functional layer,
• wherein the sacrificial layer is a monolayer that, before heat treatment, is capable of absorbing at least one part of the radiation at the at least one treatment wavelength, and
• wherein the sacrificial layer is capable of being removed after heat treatment by dissolution and/or dispersion in the solvent.