Method of performing screen printing on a substrate used for the manufacture of a solar cell, controller and apparatus for performing same

A controller for an apparatus for performing screen printing on a substrate used for the manufacture of a solar cell, the controller being configured to:

• control a first drive actuator to move a print head over a screen to perform a printing stroke in a first direction;
• and
• control a second drive actuator to move a material processing head over the screen to perform a material processing stroke in the first direction,
• the first drive actuator and the second drive actuator being controlled such that the material processing head is behind the print head during the material processing stroke, and such that the print head is moved away from the material processing head during a distance increasing phase of the printing stroke to increase a separation distance between the print head and the material processing head, an average stroke speed of the material processing head during the material processing stroke being higher than an average stroke speed of the print head during the printing stroke so that a duration of the material processing stroke is shorter than a duration of the printing stroke.