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    Light-Induced Switching of Tunable Single-Molecule Junctions

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    Type
    Article
    Authors
    Sendler, Torsten
    Luka-Guth, Katharina
    Wieser, Matthias
    Lokamani
    Wolf, Jannic Sebastian
    Helm, Manfred
    Gemming, Sibylle
    Kerbusch, Jochen
    Scheer, Elke
    Huhn, Thomas
    Erbe, Artur
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2015-04-16
    Online Publication Date
    2015-04-16
    Print Publication Date
    2015-05
    Permanent link to this record
    http://hdl.handle.net/10754/550422
    
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    Abstract
    A major goal of molecular electronics is the development and implementation of devices such as single-molecular switches. Here, measurements are presented that show the controlled in situ switching of diarylethene molecules from their nonconductive to conductive state in contact to gold nanoelectrodes via controlled light irradiation. Both the conductance and the quantum yield for switching of these molecules are within a range making the molecules suitable for actual devices. The conductance of the molecular junctions in the opened and closed states is characterized and the molecular level E 0, which dominates the current transport in the closed state, and its level broadening Γ are identified. The obtained results show a clear light-induced ring forming isomerization of the single-molecule junctions. Electron withdrawing side-groups lead to a reduction of conductance, but do not influence the efficiency of the switching mechanism. Quantum chemical calculations of the light-induced switching processes correlate these observations with the fundamentally different low-lying electronic states of the opened and closed forms and their comparably small modification by electron-withdrawing substituents. This full characterization of a molecular switch operated in a molecular junction is an important step toward the development of real molecular electronics devices.
    Citation
    Light-Induced Switching of Tunable Single-Molecule Junctions 2015:n/a Advanced Science
    Publisher
    Wiley
    Journal
    Advanced Science
    DOI
    10.1002/advs.201500017
    Additional Links
    http://doi.wiley.com/10.1002/advs.201500017
    ae974a485f413a2113503eed53cd6c53
    10.1002/advs.201500017
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; KAUST Solar Center (KSC)

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