Method for obtaining a substrate coated with a functional layer

A process for obtaining a material comprising a substrate coated on one of its sides with a coating comprising a functional layer, said process comprising:

• depositing the functional layer on the substrate, then
• depositing an absorbent layer on top of said functional layer, then
• performing a heat treatment by laser radiation to heat said functional layer, said laser radiation having at least one treatment wavelength comprised between 200 and 2500 nm, said absorbent layer including a first main face that faces the functional layer and a second main face, opposite the first main face, in direct contact with air during the heat treatment, and
• eliminating the absorbent layer,
• wherein, for a laser radiation with a wavelength of 980 nm and a laser linear power of 200 W/cm, the absorbent layer absorbs at least 80% of the laser radiation used during the heat treatment and transmits less than 10% thereof, and
• wherein the absorbent layer comprises radiation-absorbing agent dispersed in an organic matrix.