Controlled Stability of Molecular Junctions

Dulić, Diana; Pump, F.; Campidelli, Stéphane; Lavie, Pascal; Cuniberti, Gianaurelio; Filoramo, Arianna

doi:10.1002/ange.200902168

Cited by 17 publications

(18 citation statements)

References 27 publications

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“…[19] We then measured the conductance in the range from 1 G 0 to 10 À4 G 0 at various fixed electrode spacings and for time periods exceeding several hours. As a consequence of the exceptional control over the electrode separation in the MCBJ, [18,19] conductance jumps in these measurements can be attributed to reconfigurations of the molecule in the junction rather than mechanical interference of the setup.…”

mentioning

confidence: 94%

“…Since the electronic noise is much smaller than the width of the bands of the measured conductance values, we conclude that what appears to be noise in the time traces is in fact a sign of small variations in the molecular configuration. [18] Large jumps in the conductance (Figure 3 c,d) indicate that a molecular junction can spontaneously change its configuration. In Figure 3 c, random telegraph noise between two conductance values is observed indicating the possibility of forming several metastable configurations.…”

mentioning

confidence: 98%

“…[18] To obtain such "time traces", we opened the junction in small steps using a servomotor at 77 K. At this low temperature, the surface diffusion is reduced, which enhances the stability without causing extensive changes in the molecular conductance. [19] We then measured the conductance in the range from 1 G 0 to 10 À4 G 0 at various fixed electrode spacings and for time periods exceeding several hours.…”

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confidence: 99%

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Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

et al. 2011

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Different bridging geometries can explain the observation that porphyrin molecules with added thiol end groups and pyridine axial groups form more‐stable single‐molecule junctions with an increased spread in low‐bias conductance. The stability of these geometries is demonstrated by time‐dependent conductance measurements. In contrast, rodlike molecules show one preferential binding geometry.

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confidence: 94%

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confidence: 98%

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confidence: 99%

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Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

et al. 2011

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“…If working on an organic monolayer, an easy technique for a quick assessment of the electrical properties consists in contacting it by a mercury drop [1,[42][43][44][45] or a GaIn eutectic drop [46]. Another approach is to use a mechanically breaking junction (MBJ), bridged by few dithiol-terminated molecules [47][48][49][50][51]. A small and suspended metallic nanowire (typically 10 x 10 nm) is fabricated by e-beam lithography on a bendable substrate.…”

Section: Contacting the Moleculesmentioning

confidence: 99%

Molecular Nanoelectronics

Vuillaume

2010

Proc. IEEE

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Abstract-Molecular electronics is envisioned as a promising candidate for the nanoelectronics of the future. More than a possible answer to ultimate miniaturization problem in nanoelectronics, molecular electronics is foreseen as a possible way to assemble a large numbers of nanoscale objects (molecules, nanoparticules, nanotubes and nanowires) to form new devices and circuit architectures. It is also an interesting approach to significantly reduce the fabrication costs, as well as the energetical costs of computation, compared to usual semiconductor technologies. Moreover, molecular electronics is a field with a large spectrum of investigations: from quantum objects for testing new paradigms, to hybrid molecular-silicon CMOS devices. However, problems remain to be solved (e.g. a better control of the molecule-electrode interfaces, improvements of the reproducibility and reliability, etc…).

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“…Conspicuous works have focused on understanding the role of connecting atoms and their influence on the conductivity, charge-transport mechanism, and mechanical stability. [5,6] However, experimental and theoretical approaches have been generally limited to molecules with only one connection per metal electrode.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Number of Anchoring Groups on the Electronic and Mechanical Properties of Benzene‐, Anthracene‐ and Pentacene‐Based Molecular Devices

et al. 2012

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One of the central issues of molecular electronics (ME) is the study of the molecule-metal electrode contacts, and their implications for the conductivity, charge-transport mechanism, and mechanical stability. In fact, stochastic on/off switching (blinking) reported in STM experiments is a major problem of single-molecule devices, and challenges the stability and reliability of these systems. Surprisingly, the ambiguous STM results all originate from devices that bind to the metallic electrode through a one-atom connection. In the present work, DFT is employed to study and compare the properties of a set of simple acenes that bind to metallic electrodes with an increasing number of connections, in order to determine whether the increasing numbers of anchoring groups have a direct repercussion on the stability of these systems. The conductivities of the three polycyclic aromatic hydrocarbons are calculated, as well as their transmission spectra and current profiles. The thermal and mechanical stability of these systems is studied by pulling and pushing the metal-molecule connection. The results show that molecules with more than one connection per electrode exhibit greater electrical efficiency and current stability.

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Controlled Stability of Molecular Junctions

Cited by 17 publications

References 27 publications

Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

Influence of the Chemical Structure on the Stability and Conductance of Porphyrin Single‐Molecule Junctions

Molecular Nanoelectronics

Influence of the Number of Anchoring Groups on the Electronic and Mechanical Properties of Benzene‐, Anthracene‐ and Pentacene‐Based Molecular Devices

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