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Energy Level Alignment at Interfaces Between Au (111) and Thiolated Oligophenylenes of Increasing Chain Size: Theoretical Evidence of Pinning Effects

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cris.lastimport.scopus2024-02-12T20:16:14Z
dc.abstract.enAbstract We present a detailed theoretical characterization of the energetic alignment between the HOMO level of a series of thiolated oligophenylenes of increasing chain size, and the Fermi level of gold electrodes, using density functional theory (DFT) calculations for molecular self-assembled monolayers (SAMs) chemisorbed on an Au (111) surface, and the nonequilibrium Green's function (NEGF) formalism coupled to DFT for single molecule junctions. The additional role of the dynamic electronic polarization effects neglected in standard DFT calculations is also discussed. Interestingly, whereas the HOMO energy varies significantly among the unsubstituted oligomers in the gas phase, their alignment with respect to the Fermi level of the electrode is almost insensitive to chain size upon chemisorption, thus pointing to a strong pinning effect. The energy at which the HOMO is pinned strongly depends on the degree of interfacial hybridization, and hence on the contact geometry, as well as on the degree of surface coverage although a different mechanism enters into play.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorCornil, Jérôme
dc.contributor.authorDyck, Colin
dc.contributor.authorCornil, David
dc.contributor.authorGonzalez, Sandra Rodriguez
dc.contributor.authorDiez-Cabanes, Valentin
dc.contributor.authorOsella, Silvio
dc.date.accessioned2024-01-24T22:47:54Z
dc.date.available2024-01-24T22:47:54Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.identifier.doi10.1002/ADTS.201700020
dc.identifier.issn2513-0390
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106188
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofAdvanced Theory and Simulations
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.en2018 Trzaskowski
dc.titleEnergy Level Alignment at Interfaces Between Au (111) and Thiolated Oligophenylenes of Increasing Chain Size: Theoretical Evidence of Pinning Effects
dc.typeJournalArticle
dspace.entity.typePublication