Role of S–Au labile bonding in stochastic switching of molecular conductance studied by STM

Patrone, Lionel; Soullier, Jérémie; Martin, Pascal

doi:10.1002/pssb.200983829

Cited by 7 publications

(8 citation statements)

References 22 publications

(38 reference statements)

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“…49,53 RTS has also been observed in single molecular junctions (STM). [55][56][57][58] In these experiments, the current fluctuations were ascribed to stochastic modifications of the conformation of the S-Au link at the molecule/Au interface. [55][56][57] Recently, STM experiments showed that these two-level fluctuations are not observed for molecule linked on hydrogenated Si through a Si-C bond, 58 mainly because the binding energy is larger for Si-C than for Au-S bonds.…”

Section: Proposed Mechanism and Discussionmentioning

confidence: 89%

Role of Hydration on the Electronic Transport through Molecular Junctions on Silicon

et al. 2012

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ABSTRACT. Molecular electronics is a fascinating area of research with the ability to tune device properties by a chemical tailoring of organic molecules. However, molecular electronics devices often suffer from dispersion and lack of reproducibility of their electrical performances. Here, we show that water molecules introduced during the fabrication process or coming from the environment can strongly modify the electrical transport properties of molecular junctions made on hydrogen-terminated silicon.We report an increase in conductance by up to three orders of magnitude, as well as an induced asymmetry in the current-voltage curves. These observations are correlated with a specific signature of the dielectric response of the monolayer at low frequency. In addition, a random telegraph signal is observed for these junctions with macroscopic area. Electrochemical charge transfer reaction between the semiconductor channel and H + /H2 redox couple is proposed as the underlying phenomenon.Annealing the samples at 150°C is an efficient way to suppress these water-related effects. This study paves the way to a better control of molecular devices and has potential implications when these monolayers are used as hydrophobic layers or incorporated in chemical sensors.

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Section: Proposed Mechanism and Discussionmentioning

confidence: 89%

Role of Hydration on the Electronic Transport through Molecular Junctions on Silicon

et al. 2012

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“…The XPS studies showed that on average only 3.2 out of the seven sulfur (S) moieties (anchoring groups) are bound to Au at any one time. Therefore, during the period of time that the STM measurement is performed, the number of S moieties of the β‐CD molecule bound to the Au surface could change, for example, from three S–Au interactions to four S–Au interactions, due to the labile bonding between the sulfur and the Au 38. Also, the sulfur moieties can have different adsorption geometries on the Au surface, which are directly related to the conductance through the anchoring groups of the molecules.…”

Section: Resultsmentioning

confidence: 99%

Electron‐Induced Dynamics of Heptathioether β‐Cyclodextrin Molecules

Kumar

Heimbuch

Wimbush

et al. 2011

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Variable-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are performed on heptathioether β-cyclodextrin (β-CD) self-assembled monolayers (SAMs) on Au. The β-CD molecules exhibit very rich dynamical behavior, which is not apparent in ensemble-averaged studies. The dynamics are reflected in the tunneling current-time traces, which are recorded with the STM feedback loop disabled. The dynamics are temperature independent, but increase with increasing tunneling current and sample bias, thus indicating that the conformational changes of the β-CD molecules are induced by electrons that tunnel inelastically. Even for sample biases as low as 10 mV, well-defined levels are observed in the tunneling current-time traces. These jumps are attributed to the excitations of the molecular vibration of the macrocyclic β-CD molecule. The results are of great importance for a proper understanding of transport measurements in SAMs.

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“…random telegraph noise) due to sporadic configurational changes of the Au-S bond [17][18][19]. This effect is suppressed for SAMs on Si, because the Si-C or Si-O bonds have a larger binding energy [20] and it is only observed for single molecule with more free space around it [21].…”

Section: Chemistry and Self-assemblymentioning

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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Role of S–Au labile bonding in stochastic switching of molecular conductance studied by STM

Cited by 7 publications

References 22 publications

Role of Hydration on the Electronic Transport through Molecular Junctions on Silicon

Role of Hydration on the Electronic Transport through Molecular Junctions on Silicon

Electron‐Induced Dynamics of Heptathioether β‐Cyclodextrin Molecules

Molecular Nanoelectronics

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