Light-Induced Switching of Tunable Single-Molecule Junctions

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SENDLER, Torsten, Katharina LUKA-GUTH, Matthias WIESER, LOKAMANI, Jannic WOLF, Manfred HELM, Sibylle GEMMING, Jochen KERBUSCH, Elke SCHEER, Thomas HUHN, Artur ERBE, 2015. Light-Induced Switching of Tunable Single-Molecule Junctions. In: Advanced Science. 2(5), 1500017. eISSN 2198-3844. Available under: doi: 10.1002/advs.201500017

@article{Sendler2015Light-31501, title={Light-Induced Switching of Tunable Single-Molecule Junctions}, year={2015}, doi={10.1002/advs.201500017}, number={5}, volume={2}, journal={Advanced Science}, author={Sendler, Torsten and Luka-Guth, Katharina and Wieser, Matthias and Lokamani and Wolf, Jannic and Helm, Manfred and Gemming, Sibylle and Kerbusch, Jochen and Scheer, Elke and Huhn, Thomas and Erbe, Artur}, note={Article Number: 1500017} }

2015 2015-07-27T13:12:40Z Luka-Guth, Katharina Light-Induced Switching of Tunable Single-Molecule Junctions Huhn, Thomas Helm, Manfred Erbe, Artur Wieser, Matthias Wolf, Jannic Lokamani eng Lokamani Scheer, Elke Helm, Manfred Scheer, Elke Erbe, Artur Gemming, Sibylle Huhn, Thomas Luka-Guth, Katharina Sendler, Torsten Kerbusch, Jochen 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 <sub>0</sub>, 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 lowlying 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. terms-of-use Wolf, Jannic Gemming, Sibylle Sendler, Torsten Kerbusch, Jochen 2015-07-27T13:12:40Z Wieser, Matthias

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