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dc.contributor.authorBorca, Bogdana
dc.contributor.authorSchendel, Verena
dc.contributor.authorPetuya, Remi
dc.contributor.authorPentegov, Ivan
dc.contributor.authorMichnowicz, Tomasz
dc.contributor.authorKraft, Ulrike
dc.contributor.authorKlauk, Hagen
dc.contributor.authorArnau, Andres
dc.contributor.authorWahl, Peter
dc.contributor.authorSchlickum, Uta
dc.contributor.authorKern, Klaus
dc.identifier.citationBorca , B , Schendel , V , Petuya , R , Pentegov , I , Michnowicz , T , Kraft , U , Klauk , H , Arnau , A , Wahl , P , Schlickum , U & Kern , K 2015 , ' Bipolar conductance switching of single anthradithiophene molecules ' , ACS Nano , vol. 9 , no. 12 , pp. 12506-12512 .
dc.identifier.otherPURE: 238177402
dc.identifier.otherPURE UUID: 7ec081ea-ed78-4a39-a152-b057d5fefa4f
dc.identifier.otherScopus: 84952360859
dc.identifier.otherORCID: /0000-0002-8635-1519/work/46939653
dc.identifier.otherWOS: 000367280100104
dc.descriptionThe authors acknowledge funding by the Emmy-Noether-Program of the Deutsche Forschungsgemeinschaft, the SFB 767, and the Baden-Württemberg Stiftung. R.P. and A.A. thank the Basque Departamento de Universidades e Investigacion (grant no. IT-756-13) and the Spanish Ministerio de Economia y Competitividad (grant no. FIS2013-48286-C2-8752-P) for financial support.en
dc.description.abstractSingle molecular switches are basic device elements in organic electronics. The pentacene analogue anthradithiophene (ADT) shows a fully reversible binary switching between different adsorption conformations on a metallic surface accompanied by a charge transfer. These transitions are activated locally in single molecules in a low-temperature scanning tunneling microscope . The switching induces changes between bistable orbital structures and energy level alignment at the interface. The most stable geometry, the “off” state, which all molecules adopt upon evaporation, corresponds to a short adsorption distance at which the electronic interactions of the acene rings bend the central part of the molecule toward the surface accompanied by a significant charge transfer from the metallic surface to the ADT molecules. This leads to a shift of the lowest unoccupied molecular orbital down to the Fermi level (EF). In the “on” state the molecule has a flat geometry at a larger distance from the surface; consequently the interaction is weaker, resulting in a negligible charge transfer with an orbital structure resembling the highest occupied molecular orbital when imaged close to EF. The potential barrier between these two states can be overcome reversibly by injecting charge carriers locally into individual molecules. Voltage-controlled current traces show a hysteresis characteristic of a bipolar switching behavior. The interpretation is supported by first-principles calculations.
dc.relation.ispartofACS Nanoen
dc.rightsCopyright © 2015 American Chemical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at:
dc.subjectcis/trans ADT isomersen
dc.subjectConformational and electronic switchingen
dc.subjectQC Physicsen
dc.titleBipolar conductance switching of single anthradithiophene moleculesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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