Folding a Single-Molecule Junction

Wu, Chuanli; Bates, Demetris; Sangtarash, Sara; Ferri, Nicolò; Thomas, Aidan; Higgins, Simon J.; Robertson, Craig M.; Nichols, Richard J.; Sadeghi, Hatef; Vezzoli, Andrea

doi:10.1021/acs.nanolett.0c02815

Cited by 52 publications

(84 citation statements)

References 47 publications

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“…Specifically, in 1-0 where the molecular structure is just formed, a red direct tunneling path between the gold electrode and the molecular backbone, namely, through-space, is found. [34] Similarly, an identical phenomenon is found when the molecule is about to rupture (1-2). On the contrary, only the through-bond path is observed in the stable configuration .…”

Section: Resultsmentioning

confidence: 61%

The Evolution of the Charge Transport Mechanism in Single‐Molecule Break Junctions Revealed by Flicker Noise Analysis

Pan

Chen

Tang

et al. 2021

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challenging to reveal the evolution of the charge transport mechanism from the conductance characterization of singlemolecule conductance. In the past decade, numerous data analysis methods were introduced to process the conductance traces, including statistical methods, [4][5][6][7] analytical modeling, [8,9] electronic noise analysis, [10][11][12][13][14][15] and machine learning and deep learning methods. [16][17][18] Among these methods, analysis of flicker noise from the single-molecule junctions has suggested to shed new light on the understanding of charge transport mechanisms of singlemolecule junctions. [19][20][21][22] The electronic noise of single-molecule junctions can be categorized into highfrequency noise and low-frequency noise, and the latter, including flicker noise and random telegraph signal (RTS) noise (that is 1/f noise and 1/f 2 noise, respectively due to their frequency dependence nature), is the result of rearrangement of metal atom on the electrode surface and the fluctuation of the microenvironment of molecule junctions. [23] Previous reports have shown that flicker noise exhibits a power-law dependence with conductance that can serve as a probe of the electrode-molecule coupling. [21,22] Specifically, if the dependence exponent is close to 1.0, the electrode-molecule coupling follows the throughbond mechanism, while an exponent close to 2.0 corresponds to a through-space coupling. During the evolution of different junction configurations, the interface coupling may change dramatically with the evolution of electrode-molecule coupling during the break junction process, suggesting that an investigation of the time evolution of flicker noise in molecule junctions can provide a unique tool to understand the evolution of charge transport mechanisms. [24][25][26][27][28][29] However, the time dimension of the conductance traces is hardly deciphered in past studies. Toward the time resolution, time-frequency analysis (TFA) has proven to be an effective tool that combines both time and frequency dimensions in processing signals such as speech signals and polysomnography signals, [30,31] suggesting that TFA can be a promising approach to characterize the time evolution behavior of flicker noise in single-molecule junctions.In this study, we report that flicker noise can serve as an indicator of the evolution of charge transport mechanisms in single-molecule break junctions. By assigning a dependence The electronic noise characterization of single-molecule devices provides insights into the mechanisms of charge transport. In this work, it is reported that flicker noise can serve as an indicator of the time-dependent evolution of charge transport mechanisms in the single-molecule break junction process. By introducing time-frequency analysis, the authors find that flicker noise components of the molecule junction show time evolution behavior in the dynamic break junction process. A further investigation of the power-law dependence of flicker with conductance during the dynamic break junction pro...

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Section: Resultsmentioning

confidence: 61%

The Evolution of the Charge Transport Mechanism in Single‐Molecule Break Junctions Revealed by Flicker Noise Analysis

Pan

Chen

Tang

et al. 2021

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“…Additionally, this distinction of the resistance scaling of the noise could detect molecular folding, where the folded molecule experienced a parallel through-space current noise between the gathering phenyl rings, which is absent in an unfolded junction. 46 The noise characteristics also deliver fundamental information about two-dimensional devices, like graphene nanogaps 47,48 or graphene single-electron transistors. 49 The former system is exemplified in Fig.…”

Section: Resistance Scaling Of the Noisementioning

confidence: 99%

1/f noise spectroscopy and noise tailoring of nanoelectronic devices

Balogh¹,

Mezei²,

Pósa³

et al. 2021

Preprint

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In this paper, we review the 1/ f -type noise properties of nanoelectronic devices focusing on three demonstrative platforms: resistive switching memories, graphene nanogaps and single-molecule nanowires. The functionality of such ultrasmall devices is confined to an extremely small volume, where bulk considerations on the noise loose their validity: the relative contribution of a fluctuator heavily depends on its distance from the device bottleneck, and the noise characteristics are sensitive to the nanometer-scale device geometry and the details of the mostly non-classical transport mechanism. All these are reflected by a highly system-specific dependence of the noise properties on the active device volume (and the related device resitance), the frequency, or the applied voltage. Accordingly, 1/ f -type noise measurements serve as a rich fingerprint of the relevant transport and noise-generating mechanisms in the studied nanoelectronic systems. Finally, we demonstrate that not only the fundamental understanding and the targeted noise suppression is fueled by the 1/ f -type noise analysis, but novel probabilistic computing hardware platforms heavily seek well tailorable nanoelectric noise sources.

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“…Toward this end, experimental techniques such as scanning tunneling microscopy break junction (STM-BJ) (4) and mechanically controllable break junction (MCBJ) (5) in combination with nonequilibrium Green's function (NEGF) based computations (3) provide a means to capture and analyze electronic charge transport phenomena in molecular junctions. These techniques have demonstrated that molecules can function as wires (6,7), switches (8)(9)(10), rectifiers (11,12), transistors (13), and potentiometers (14). However, for creating functional devices, it is essential to assemble such molecular electronic components on a single scaffold akin to a printed circuit board in conventional electronics.…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Tuning the Conductance of Multiple Embedded Circuits in Bis-Terpyridine-Based Single Molecule Breadboard Junctions

Kumar

Seth

Kaliginedi

et al. 2022

Preprint

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Assembling and prototyping multiple circuits on a common breadboard scaffold is critical for developing functional single molecule electronic devices. However, at present, controlling and combining the electronic properties of multiple circuits within a single-molecule junction remains an unresolved challenge. Here, we describe the molecular conductance distributions for five single terminal circuits each within three constitutional isomers of a bis-terpyridine-based molecular breadboard junction through a rigorous computational framework which accounts for molecular conformational flexibility and the relative electrode accessibility (REA) of anchoring groups. The isomers, termed TPo, TPm, and TPp, differ in the relative placement of the linking nitrogen (N) atoms at ortho, meta, and para positions, respectively, of the peripheral pyridyl rings. We demonstrate that quantum interference effects (QIE) and REA of the anchoring N atoms can be exploited to alter the relative conductance of the five single terminal circuits within the molecular breadboards by ~ 4–32 times. We introduce a phase-plot-analysis to highlight the interdependence of QIE- and REA-induced changes in the conductance states of the basis circuits across breadboard pairs. Our studies predict that REA should not impact the QIE-induced boost in circuit conductance for TPp relative to that in TPm. In contrast, REA suppresses the QIE boost for circuit conductance in TPo relative to that in TPm. Our results showcase the possibility of accessing the combined effect of QIE and REA within an experimental break-junction setup to develop diverse molecular electronic breadboards with multiple embedded circuits and distinct electronic properties.

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Folding a Single-Molecule Junction

Cited by 52 publications

References 47 publications

The Evolution of the Charge Transport Mechanism in Single‐Molecule Break Junctions Revealed by Flicker Noise Analysis

The Evolution of the Charge Transport Mechanism in Single‐Molecule Break Junctions Revealed by Flicker Noise Analysis

1/f noise spectroscopy and noise tailoring of nanoelectronic devices

Simultaneously Tuning the Conductance of Multiple Embedded Circuits in Bis-Terpyridine-Based Single Molecule Breadboard Junctions

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