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Role of intrinsic molecular dipole in energy level alignment at organic interfaces
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
University of Twente, The Netherlands.
University of Twente, The Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
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2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, no 22, 223301 -1-223301-4 p.Article in journal (Refereed) Published
Abstract [en]

The energy level alignment in metal-organic and organic-organic junctions of the widely used materials tris-(8-hydroxyquinoline)aluminum (Alq3) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) is investigated. The measured alignment schemes for single and bilayer films of Alq3 and NTCDA are interpreted with the integer charge transfer (ICT) model. Single layer films of Alq3 feature a constant vacuum level shift of ∼0.2–0.4 eV in the absence of charge transfer across the interface. This finding is attributed to the intrinsic dipole of the Alq3 molecule and (partial) ordering of the molecules at the interfaces. The vacuum level shift changes the onset of Fermi level pinning, as it changes the energy needed for equilibrium charge transfer across the interface.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2013. Vol. 102, no 22, 223301 -1-223301-4 p.
Keyword [en]
charge exchange, Fermi level, interface states, organic semiconductors
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-96473DOI: 10.1063/1.4809567ISI: 000320621600081OAI: oai:DiVA.org:liu-96473DiVA: diva2:642901
Available from: 2013-08-23 Created: 2013-08-20 Last updated: 2017-12-06Bibliographically approved

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Lindell, LindaFahlman, MatsBraun, Slawomir

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