A combination of surface energy-guided blade coating and inkjet printing is used to fabricate an all-printed high performance, high yield, and low variability organic thin film transistor (OTFT) array on a plastic substrate. Functional inks and printing processes were optimized to yield self-assembled homogenous thin films in every layer of the OTFT stack. Specifically, we investigated the effect of capillary number, semiconductor ink composition (small molecule-polymer ratio), and additive high boiling point solvent concentrations on film fidelity, pattern design, device performance and yields.
Keywords: Printed organic electronics; flexible electronics; organic semiconductor blends; organic thin film transistors; solution processed thin films.
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.