Spatially Modulating Interfacial Properties of Transparent Conductive Oxides: Patterning Work Function with Phosphonic Acid Self-Assembled Monolayers

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.[13] 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

Advanced Materials

24 (5)





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