Noise spectroscopy of molecular electronic junctions

Kim, Youngsang; Song, Hyunwook

doi:10.1063/5.0027602

Cited by 17 publications

(10 citation statements)

References 190 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In conventional rigid molecular wires (Figure a) based on break-junction techniques, molecules are attached to Au electrodes through covalent, dative, or electrostatic anchors. Upon slight mechanical perturbation, however, the molecular junction breaks because of the lack of moving freedom of the rigid molecular backbone . To solve this problem, π–π dimers are employed to construct soft supramolecular junctions (Figure b). , In these junctions, either of the two molecules connects to the electrode at one end, and the bonding strength between the molecule and electrode is stronger than that of π–π dimers .…”

Section: Structural Features Of Mimsmentioning

confidence: 99%

A Roadmap for Mechanically Interlocked Molecular Junctions at Nanoscale

Yang

Chen

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The beauty and utility of mechanically interlocked architectures have received considerable notice from scientists in the past several decades. Plentiful scientific and technological achievements have been made and developed because of conjoining mechanically interlocked molecules (MIMs) and molecular electronic devices at nanoscale. The interaction mechanisms and translational dynamics of various MIMs, e.g., rotaxanes, catenanes, and daisy chains, have been investigated systemically through different experimental methods. On account of the recent advances of single-molecule techniques, the electrical and mechanical performance of mechanically interlocked molecular junctions (MIMJs) or nanodevices have been explored in a timely manner. In this Review, we survey the field of MIMs from a perspective of unique structural properties including topological features, translational dynamics, bistable switching properties, insulation effects, and dynamic stability present in MIMs. We then give a fundamental description of electron transport mechanisms in MIMJs for three different nanodevice geometries: (i) monolayer switching tunnel junctions (MSTJs), (ii) single-molecule junctions (SMJs) based on MIMs, and (iii) real-time transistor-like platforms.

show abstract

Section: Structural Features Of Mimsmentioning

confidence: 99%

A Roadmap for Mechanically Interlocked Molecular Junctions at Nanoscale

Yang

Chen

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…1,2,4,6,7 The basic output of the break junction measurements is a statistical ensemble of conductance vs. electrode separation traces, from which the fingerprints of the single-molecule configurations can be visualized on conductance histograms. This analysis is frequently extended by more delicate experimental methods, like force, 2,[8][9][10][11] noise, [11][12][13][14][15][16][17][18][19][20][21][22] thermoelectric power, 2,23,24 thermal conductance, [25][26][27] quantum conductance fluctuation 28,29 or superconducting subgap spectroscopy measurements. 30,31 The combination of such methods was found to be extremely efficient in resolving the fine details of the structural and electronic properties of single-molecule nanowires.…”

Section: Introductionmentioning

confidence: 99%

Configuration-specific insight to single-molecule conductance and noise data revealed by principal component projection method

Balogh¹,

Mezei²,

Nóra³

et al. 2023

Preprint

View full text Add to dashboard Cite

We explore the merits of neural network boosted, principal-component-projection-based, unsupervised data classification in singlemolecule break junction measurements, demonstrating that this method identifies highly relevant trace classes according to the welldefined and well-visualized internal correlations of the dataset. To this end, we investigate single-molecule structures exhibiting double molecular configurations, exploring the role of the leading principal components in the identification of alternative junction evolution trajectories. We show how the proper principal component projections can be applied to separately analyze the high or low-conductance molecular configurations, which we exploit in 1/ f -type noise measurements on bipyridine molecules. This approach untangles the unclear noise evolution of the entire dataset, identifying the coupling of the aromatic ring to the electrodes through the π orbitals in two distinct conductance regions, and its subsequent uncoupling as these configurations are stretched.

show abstract

“…Molecular electronics have been a field of broad interest over the last few decades. − It is foreseen that logic systems, such as microcontrollers, memories, integrated circuits, etc., can be manufactured from either single molecule or molecular arrays. − The junctions with organic active layers can be fabricated from a solution for a low cost while being synthetically tunable, and all these advantages make them become an ideal option for flexible electronics. Covalent attachment of SAMs on Au surfaces typically carried out by using thiols has been widely studied and is well understood, , and forming intimate contact to free standing SAMs with a covalent bond to a metal electrode is a general method to construct electrode–organic–electrode junctions. − Numerous trials to contact SAMs by thermal vapor deposition directly or onto lithographically defined nanopores , have exhibited a high risk of shorted devices as the evaporated molecules can either penetrate into or thermally destroy the monolayer.…”

Section: Introductionmentioning

confidence: 99%

Metal–Molecule–Metal Junctions on Self-Assembled Monolayers Made with Selective Electroless Deposition

Jie

Wang

Huang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Electronic transport through molecular-scale devices has been studied extensively for its extraordinary dimension superiority. Assembling such devices into large-scale functional circuits is crucial since the molecular tunnel junctions must be reliable, stable and reproducible during technological applications. In ideal circumstances, the device architecture should be designed such that the metal−molecule−metal (MMM) junctions can be analyzed by the more sensitive four point probe system. In this paper, we expound a delicate method to manufacture molecular junctions, which show excellent stability and reproducibility with high yields (>91 per cent). We form self-assembled monolayers (SAMs) on conductive Au thin film by microcontact printing and then generate robust covalently bound metal thin film electrodes on top of the SAMs by selective electroless deposition. Following MMM junction formation, a photoresist is coated and wells are opened on each feature by lithography. Then, Au thin film, as a permanent top electrode, is deposited into the photolithographically defined well. Conductivity analyzations were carried out on the 50 μm square junctions by the four point probe measurement, and the results showed reproducible tunneling I−V characteristics. This method reveals an approach not only offering a unique vehicle to investigate the electrical properties of molecule ensembles in MMMs, but also making a significant step toward MMM applications at the device level.

show abstract

Noise spectroscopy of molecular electronic junctions

Cited by 17 publications

References 190 publications

A Roadmap for Mechanically Interlocked Molecular Junctions at Nanoscale

A Roadmap for Mechanically Interlocked Molecular Junctions at Nanoscale

Configuration-specific insight to single-molecule conductance and noise data revealed by principal component projection method

Metal–Molecule–Metal Junctions on Self-Assembled Monolayers Made with Selective Electroless Deposition

Contact Info

Product

Resources

About