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Organic heterojunctions: Contact-induced molecular reorientation, interface states, and charge redistribution
Humboldt Univ, Inst Phys, D-10099 Berlin, Germany.;Humboldt Univ, IRIS Adlershof, D-10099 Berlin, Germany..
Humboldt Univ, Inst Phys, D-10099 Berlin, Germany.;Humboldt Univ, IRIS Adlershof, D-10099 Berlin, Germany..
Humboldt Univ, Inst Phys, D-10099 Berlin, Germany.;Humboldt Univ, IRIS Adlershof, D-10099 Berlin, Germany..
Humboldt Univ, Inst Phys, D-10099 Berlin, Germany.;Humboldt Univ, IRIS Adlershof, D-10099 Berlin, Germany.;Helmholtz Zentrum Berlin Mat & Energie GmbH, Bereich Erneuerbare Energien, Berlin, Germany..
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 21291Article in journal (Refereed) Published
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Abstract [en]

We reveal the rather complex interplay of contact-induced re-orientation and interfacial electronic structure-in the presence of Fermi-level pinning-at prototypical molecular heterojunctions comprising copper phthalocyanine (H16CuPc) and its perfluorinated analogue (F16CuPc), by employing ultraviolet photoelectron and X-ray absorption spectroscopy. For both layer sequences, we find that Fermi-level (E-F) pinning of the first layer on the conductive polymer substrate modifies the work function encountered by the second layer such that it also becomes E-F-pinned, however, at the interface towards the first molecular layer. This results in a charge transfer accompanied by a sheet charge density at the organic/organic interface. While molecules in the bulk of the films exhibit upright orientation, contact formation at the heterojunction results in an interfacial bilayer with lying and co-facial orientation. This interfacial layer is not EF-pinned, but provides for an additional density of states at the interface that is not present in the bulk. With reliable knowledge of the organic heterojunction's electronic structure we can explain the poor performance of these in photovoltaic cells as well as their valuable function as charge generation layer in electronic devices.

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2016. Vol. 6, article id 21291
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Physical Sciences
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Physics
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URN: urn:nbn:se:kau:diva-41201DOI: 10.1038/srep21291ISI: 000370370200001PubMedID: 26887445OAI: oai:DiVA.org:kau-41201DiVA, id: diva2:916332
Available from: 2016-04-01 Created: 2016-04-01 Last updated: 2017-12-06Bibliographically approved

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Hansson, RickardMoons, Ellen

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