Method for obtaining a coated substrate with a functional layer

The invention relates to a material of a process for obtaining comprising a substrate coated on at least a portion of at least one of its faces at least a functional layer, said method comprising: - a step of depositing the or each functional layer and - a step of depositing a sacrificial layer on said at least one functional layer, then - a heat treatment step by means of a radiation having at least a processing wavelength between 200 and 2500 nm, said sacrificial layer being in contact with the air during this heat treatment step, said sacrificial layer being such that before heat treatment it absorbs at least a portion of said radiation at said at least one processing wavelength and that after heat treatment is capable of being dissolved in a solvent.