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A single-level tunnel model to account for electrical transport through single molecule-and self-assembled monolayer-based junctions

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Show simple item record Garrigues, Alvar R. Yuan, Li Wang, Lejia Mucciolo, Eduardo R. Thompson, Damien del Barco, Enrique Nijhuis, Christian A. 2017-11-22T10:13:46Z 2017-11-22T10:13:46Z 2016
dc.description peer-reviewed en_US
dc.description.abstract We present a theoretical analysis aimed at understanding electrical conduction in molecular tunnel junctions. We focus on discussing the validity of coherent versus incoherent theoretical formulations for single-level tunneling to explain experimental results obtained under a wide range of experimental conditions, including measurements in individual molecules connecting the leads of electromigrated single-electron transistors and junctions of self-assembled monolayers (SAM) of molecules sandwiched between two macroscopic contacts. We show that the restriction of transport through a single level in solid state junctions (no solvent) makes coherent and incoherent tunneling formalisms indistinguishable when only one level participates in transport. Similar to Marcus relaxation processes in wet electrochemistry, the thermal broadening of the Fermi distribution describing the electronic occupation energies in the electrodes accounts for the exponential dependence of the tunneling current on temperature. We demonstrate that a single-level tunnel model satisfactorily explains experimental results obtained in three different molecular junctions (both single-molecule and SAM-based) formed by ferrocene-based molecules. Among other things, we use the model to map the electrostatic potential profile in EGaIn-based SAM junctions in which the ferrocene unit is placed at different positions within the molecule, and we find that electrical screening gives rise to a strongly non-linear profile across the junction. en_US
dc.language.iso eng en_US
dc.publisher Nature Publishing Group en_US
dc.relation.ispartofseries Scientific Reports;6:26517
dc.subject single-level tunnel model en_US
dc.subject electrical transport en_US
dc.subject single molecule en_US
dc.subject self-assembled en_US
dc.subject monolayer-based junctions en_US
dc.title A single-level tunnel model to account for electrical transport through single molecule-and self-assembled monolayer-based junctions en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1038/srep26517
dc.contributor.sponsor National Science Foundation en_US
dc.contributor.sponsor SFI en_US
dc.contributor.sponsor National Research Foundation Singapore en_US
dc.relation.projectid NSF-ECCS #1402990 en_US
dc.relation.projectid NSF-ECCS #1518863 en_US
dc.relation.projectid 11/SIRG.B2111 en_US
dc.relation.projectid NRF-RF 2010-03 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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