Figure 1: Coating process and morphology and thickness of the coated films.
From: Ambient fabrication of flexible and large-area organic light-emitting devices using slot-die coating
(a) Schematic view of the slot-die roll coating of the (yellow) active layer and the (blue) semitransparent anode on top of a (pink) flexible cathode-coated substrate. The ink is transferred from an external container via a pump to the slot-die head (orange). (b) Photograph of the roll coater during the deposition of the active layer. (c) Close-up photograph of the slot-die head during coating of an active layer stripe. (d) Atomic force microscopy (AFM) data indicating the thickness of the anodic, active and cathodic layers in the LEC device stack. (e) Enlarged AFM data indicating the roughness of the anodic and the cathodic interfaces. (f) Exploded view of 10×10 μm2 AFM height maps of the three constituent layers. (g–i) 2×2 μm2 AFM phase-contrast images of (g) the PEDOT-PSS anode, (h) the active layer and (i) the ZnO cathode.
