Impact of Functionalized Polystyrenes as the Electron Injection Layer on Gold and Aluminum Surfaces: A Combined Theoretical and Experimental Study

Hdl Handle:
http://hdl.handle.net/10034/559537
Title:
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
Abstract:
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.
Affiliation:
School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA30332, USA
Citation:
Impact of Functionalized Polystyrenes as the Electron Injection Layer on Gold and Aluminum Surfaces: A Combined Theoretical and Experimental Study 2014, 54 (5-6):779 Israel Journal of Chemistry
Publisher:
Wiley
Journal:
Israel Journal of Chemistry
Publication Date:
Jun-2014
URI:
http://hdl.handle.net/10034/559537
DOI:
10.1002/ijch.201400041
Additional Links:
http://doi.wiley.com/10.1002/ijch.201400041
Type:
Article
Language:
en_US
ISSN:
00212148
Sponsors:
US Department of Energy under grant DE-FG02-04ER46165
Appears in Collections:
Natural Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorPapadopoulos, Theodoros A.en
dc.contributor.authorLi, Hongen
dc.contributor.authorKim, Eung-Gunen
dc.contributor.authorLiu, Jieen
dc.contributor.authorCella, James A.en
dc.contributor.authorHeller, Christian M.en
dc.contributor.authorShu, Andrewen
dc.contributor.authorKahn, Antoineen
dc.contributor.authorDuggal, Anilen
dc.contributor.authorBrédas, Jean-Lucen
dc.date.accessioned2015-07-10T13:55:43Zen
dc.date.available2015-07-10T13:55:43Zen
dc.date.issued2014-06en
dc.identifier.citationImpact of Functionalized Polystyrenes as the Electron Injection Layer on Gold and Aluminum Surfaces: A Combined Theoretical and Experimental Study 2014, 54 (5-6):779 Israel Journal of Chemistryen
dc.identifier.issn00212148en
dc.identifier.doi10.1002/ijch.201400041en
dc.identifier.urihttp://hdl.handle.net/10034/559537en
dc.description.abstractAt 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.en
dc.description.sponsorshipUS Department of Energy under grant DE-FG02-04ER46165en
dc.language.isoen_USen
dc.publisherWileyen
dc.relation.urlhttp://doi.wiley.com/10.1002/ijch.201400041en
dc.rightsArchived with thanks to Israel Journal of Chemistryen
dc.rightsAn error occurred on the license name.*
dc.rights.uriAn error occurred getting the license - uri.*
dc.subjectdensity functional theoryen
dc.subjectmetal/organic interfacesen
dc.subjectaminesen
dc.subjectelectrochemistryen
dc.subjectorganic semiconductorsen
dc.subjectpolymersen
dc.titleImpact of Functionalized Polystyrenes as the Electron Injection Layer on Gold and Aluminum Surfaces: A Combined Theoretical and Experimental Studyen_US
dc.typeArticleen
dc.contributor.departmentSchool of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA30332, USAen
dc.identifier.journalIsrael Journal of Chemistryen
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