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Molecular-level realignment in donor-acceptor bilayer blends on metals

AuthorsBorghetti, Patrizia ; Oteyza, D. G. de ; Rogero, Celia ; Goiri, Elizabeth ; Verdini, Alberto; Cossaro, Albano; Floreano, Luca; Ortega, J. Enrique
Issue Date2016
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 120(11): 5997-6005 (2016)
AbstractMolecular bilayers made up of a donor-acceptor blend in contact with the metal and capped with a single-component layer show a tunable energy level alignment at both metal-organic and organic-organic interfaces. To ensure sharp heteromolecular interfaces, a contact layer is formed by a stable blend of pentacene (PEN) and perfluorinated copper phthalocyanine (FCuPc) on Au(111) and Ag(111) and of perfluoropentacene (PFP) and copper phthalocyanine (CuPc) on Ag(111). Core-level and valence band photoemission reveal that, upon capping with pure FCuPc, CuPc, and PEN, the electronic states of both contact and capping layers >realign> with respect to the monolayer and the multilayer references. The sign of the shift depends clearly on whether the capping layer is donor-like (PEN, CuPc) or acceptor-like (FCuPc). As revealed by NEXAFS, the shift in electronic levels of the contact layer upon capping leads to a spectral density variation across the Fermi edge (E); i.e., it induces molecule/metal charge transfer.
Publisher version (URL)http://dx.doi.org/10.1021/acs.jpcc.5b11373
Identifiersdoi: 10.1021/acs.jpcc.5b11373
e-issn: 1932-7455
issn: 1932-7447
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