Barrier formation at organic interfaces in a Cu(100)-benzenethiolate-pentacene heterostructure

The energy level alignment at the metal-organic and organic-organic interfaces of the Cu(100)/benzenethiolate/pentacene heterostructure is studied by photoemission spectroscopy and discussed theoretically using a model that includes, in a consistent way, charge transfer, Pauli repulsion, intrinsic m...

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Published inPhysical review letters Vol. 100; no. 2; p. 027601
Main Authors Betti, M G, Kanjilal, A, Mariani, C, Vázquez, H, Dappe, Y J, Ortega, J, Flores, F
Format Journal Article
LanguageEnglish
Published United States 18.01.2008
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Summary:The energy level alignment at the metal-organic and organic-organic interfaces of the Cu(100)/benzenethiolate/pentacene heterostructure is studied by photoemission spectroscopy and discussed theoretically using a model that includes, in a consistent way, charge transfer, Pauli repulsion, intrinsic molecular dipoles, and interface screening as a function of coverage. Despite the different nature of the two interfaces, our model provides a unified explanation for the work-function changes at both junctions and enables us to determine the benzenethiolate orientation as a function of coverage.
ISSN:0031-9007
DOI:10.1103/physrevlett.100.027601