High on-off conductance switching ratio in optically-driven self-assembled conjugated molecular systems
| Autor: | Jean Roncali, Philippe Blanchard, Kacem Smaali, Sandrine Karpe, Dominique Deresmes, Sylvie Godey, Maitena Ocafrain, Dominique Vuillaume, Alain Rochefort, Stéphane Lenfant |
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| Přispěvatelé: | Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Chimie et Ingénierie Moléculaire d'Angers (CIMA), Université d'Angers (UA)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
molecular electronics first principles General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Photoionization 010402 general chemistry 01 natural sciences Molecular physics chemistry.chemical_compound Delocalized electron Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Molecular orbital Molecular switch [PHYS]Physics [physics] Condensed Matter - Mesoscale and Nanoscale Physics General Engineering Conductance Molecular electronics Self-assembled monolayer 021001 nanoscience & nanotechnology 3. Good health 0104 chemical sciences molecular switch charge transport Condensed Matter - Other Condensed Matter azobenzene Azobenzene chemistry self-assembled monolayer sense organs 0210 nano-technology Other Condensed Matter (cond-mat.other) |
| Zdroj: | ACS Nano ACS Nano, American Chemical Society, 2010, 4, pp.2411-2421. ⟨10.1021/nn100295x⟩ ACS Nano, 2010, 4, pp.2411-2421. ⟨10.1021/nn100295x⟩ |
| ISSN: | 1936-0851 |
| DOI: | 10.1021/nn100295x⟩ |
| Popis: | A new azobenzene-thiophene molecular switch is designed, synthesized and used to form self-assembled monolayers (SAM) on gold. An "on/off" conductance ratio up to 7x1E3 (with an average value of 1.5x1E3) is reported. The "on" conductance state is clearly identified to the cis isomer of the azobenzene moiety. The high "on/off" ratio is explained in terms of photo-induced, configuration-related, changes in the electrode-molecule interface energetics (changes in the energy position of the molecular orbitals with respect to the Fermi energy of electrodes) in addition to changes in the tunnel barrier length (length of the molecules). First principles DFT calculations demonstrate a better delocalization of the frontier orbitals, as well as a stronger electronic coupling between the azobenzene moiety and the electrode for the cis configuration over the trans one. Measured photoionization cross-sections for the molecules in the SAM are close to the known values for azobenzene derivatives in solution. Comment: 1 file with main text, figure and suppementary information |
| Databáze: | OpenAIRE |
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