The polymer-electrode interface can critically affect the performance of organic electronic devices, including thin-film transistors (TFTs), organic light-emitting diodes (OLEDs), and organic photovoltaics (OPVs). Self-assembled monolayers (SAMs) have been used to modify the surface chemistry of polymer,[1,2] metal,[3–9] and metal oxide[10–16] electrodes in order to control properties including wettability, work function, and charge transfer, by using many functional group/substrate combinations. Examples range from thiols on gold,[3–8] to silanes on hydroxyl-terminated surfaces,[11,12,15,17] to mixtures of SAMs containing different terminal functional groups on metal oxide buffer layers. A number of groups have incorporated SAMs into OLEDs,[1–4,6,10–12,18,19] with many focusing on the use of phosphonic acid SAMs to modulate interfacial properties and improve device performance.
Knesting, K.M., P.J. Hotchkiss, B.A. MacLeod, S.R. Marder, D.S. Ginger