Method for forming an organic material layer on a substrate

A method of forming an organic material layer with a layer thickness on a substrate in an in-line deposition system, the method comprising:

• depositing an organic material with a predetermined deposition rate profile through a plurality of openings of an injector onto a substrate, the injector being in relative movement with respect to the substrate,
• wherein the predetermined deposition rate profile is a non-constant deposition profile which comprises a first deposition rate range provided to deposit at least one first monolayer of the organic material layer with a first predetermined average deposition rate onto the substrate and a second predetermined deposition rate range provided to deposit at least one second monolayer of the organic material layer with a second predetermined average deposition rate onto the at least first monolayer provided on the substrate, the first average deposition rate being smaller than the second average deposition rate, and wherein the injection of organic material through the openings of the injector towards the substrate is controlled for realizing the predetermined deposition rate profile.