Impact of Functionalized Polystyrenes as the Electron Injection Layer on Gold and Aluminum Surfaces: A Combined Theoretical and Experimental Study
Authors
Papadopoulos, Theodoros A.Li, Hong
Kim, Eung-Gun
Liu, Jie
Cella, James A.
Heller, Christian M.
Shu, Andrew
Kahn, Antoine
Duggal, Anil
Brédas, Jean-Luc
Affiliation
School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA30332, USAPublication Date
2014-06-06
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At metal/organic interfaces, insertion of an organic monolayer can significantly modify the surface properties of the substrate, especially in terms of charge injection across the interface. Here, we study the formation of an insulating monolayer of morpholine or amine-functionalized polystyrene on Al(111) and Au(111) surfaces and its impact on surface work-function and charge injection. First principles calculations based on density functional theory have been carried out and point to a significant decrease of the work-function for the modified metal surfaces, in very good agreement with ultraviolet photoemission spectroscopy measurements performed on the Au(111) surface. In addition, a bilayer cathode consisting of a thin film of high work-function metal, such as Al and Au, and a layer of amine-functionalized polystyrene is also fabricated and tested in organic light-emitting diodes. Such bilayer structures exhibit substantially enhanced efficiency when compared to controls without the functionalized polymers. Our combined theoretical and experimental investigation gives insight into how a thin layer of a commodity polymer can be used to transform rather high work-function metals into high-performance cathodes providing efficient electron injection.Citation
Papadopoulos, T. A., Li, H., Kim, E. G., Liu, J., Cella, J. A., Heller, C. M., ... & Brédas, J. L. (2014). Impact of Functionalized Polystyrenes as the Electron Injection Layer on Gold and Aluminum Surfaces: A Combined Theoretical and Experimental Study. Israel Journal of Chemistry, 54(5‐6), 779-788.Publisher
WileyJournal
Israel Journal of ChemistryAdditional Links
http://doi.wiley.com/10.1002/ijch.201400041Type
ArticleLanguage
en_USISSN
0021-2148Sponsors
US Department of Energy under grant DE-FG02-04ER46165ae974a485f413a2113503eed53cd6c53
10.1002/ijch.201400041
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