System and method to evaporate an OLED layer stack in a vertical orientation

A vacuum orientation module for a substrate processing system is described. The module includes at least a first vacuum orientation chamber, comprising: a vacuum chamber; a first transportation track within the vacuum chamber, the first transportation track having a first support structure and a first driving structure and defining a transportation direction; an orientation actuator to change the substrate orientation between a non-vertical orientation and a non-horizontal orientation, the vacuum chamber has a first pair of two slit openings, particularly essentially vertical slit openings, at opposing side walls of the vacuum chamber in the transportation direction; and a second transportation track within the vacuum chamber, the second transportation track having a second support structure and a second driving structure extending along the transportation direction, the vacuum chamber has a second pair of two slit openings at the opposing side walls of the vacuum chamber.