Post-Oven Induced Surface Hydrophobicity Degradation of CF4 Plasma Treated Polyimide Photo Resistance

Polyimide films were treated by CF4 plasma to serve as bank material for inkjet printing OLED. Excellent hydrophobicity was thus obtained due to the F implantation. However, degradation of hydrophobicity was observed by post-oven, an inevitable process for inkjet printing. This degradation is probably caused by the H
₂
O/O
₂
chemical adsorption.