Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions

Zhou, Jianfeng; Samanta, Sudip; Guo, Cunlan; Locklin, Jason; Xu, Bingqian

doi:10.1039/c3nr01284k

Cited by 30 publications

(36 citation statements)

References 62 publications

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“…3a) on the conductance traces with a 180 phase shi (Fig. 48 The NDR was observed to occur only for the hollow-top Au-S binding conguration. The saw tooth modulation applied on the free-holding process of the stretch-hold mode measurements of Au-C8DT/C8DA-Au illustrated more detailed phenomena: (1) conductance switching between different conductance sets were observed on some conductance traces (Fig.…”

Section: Experimental Modulationsmentioning

confidence: 94%

“…The steady linear retractions of continuous-stretch mode SPM measurements created single molecular junctions across which single molecular conductance was measured, but the junctions were short-lived and the histograms missed signicant details which are important for understanding the SMBJ systems they were measuring. 48 Fig. 1a shows, so that the system paused momentarily and allowed the junction to settle into a quasi-relaxed state.…”

Section: Experimental Modulationsmentioning

confidence: 99%

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Measurement and control of detailed electronic properties in a single molecule break junction

et al. 2014

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The lack of detailed experimental controls has been one of the major obstacles hindering progress in molecular electronics. While large fluctuations have been occurring in the experimental data, specific details, related mechanisms, and data analysis techniques are in high demand to promote our physical understanding at the single-molecule level. A series of modulations we recently developed, based on traditional scanning probe microscopy break junctions (SPMBJs), have helped to discover significant properties in detail which are hidden in the contact interfaces of a single-molecule break junction (SMBJ). For example, in the past we have shown that the correlated force and conductance changes under the saw tooth modulation and stretch-hold mode of PZT movement revealed inherent differences in the contact geometries of a molecular junction. In this paper, using a bias-modulated SPMBJ and utilizing emerging data analysis techniques, we report on the measurement of the altered alignment of the HOMO of benzene molecules with changing the anchoring group which coupled the molecule to metal electrodes. Further calculations based on Landauer fitting and transition voltage spectroscopy (TVS) demonstrated the effects of modulated bias on the location of the frontier molecular orbitals. Understanding the alignment of the molecular orbitals with the Fermi level of the electrodes is essential for understanding the behaviour of SMBJs and for the future design of more complex devices. With these modulations and analysis techniques, fruitful information has been found about the nature of the metal-molecule junction, providing us insightful clues towards the next step for in-depth study.

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Section: Experimental Modulationsmentioning

confidence: 94%

Section: Experimental Modulationsmentioning

confidence: 99%

Measurement and control of detailed electronic properties in a single molecule break junction

et al. 2014

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“…In addition to its capacity to measure single-molecule-level I-V, the SM BJ technique also enables solid moleculeelectrode contact via covalent bonds on both sides of the junction, which markedly diminishes the uncertainty, typical in nanopore and STM measurements, at one of the molecule-electrode interfaces. Indeed, the SM BJ technique was recently exploited as a powerful tool to study NDC behavior at the single-molecule level [30,34,[43][44][45][46][47][48]].…”

Section: Measuring Weak Ndc Behavior Using the Singlemolecule Break Jmentioning

confidence: 99%

Negative differential conductance in molecular junctions: an overview of experiment and theory

Dubi

2015

J. Phys.: Condens. Matter

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One of the ultimate goals of molecular electronics is to create technologies that will complement-and eventually supersede-Si-based microelectronics technologies. To reach this goal, electronic properties that mimic at least some of the electrical behaviors of today's semiconductor components must be recognized and characterized. An outstanding example for one such behavior is negative differential conductance (NDC), in which an increase in the voltage across the device terminals results in a decrease in the electric current passing through the device. This overview focuses on the NDC phenomena observed in metal-single molecule-metal molecular junctions, and is roughly divided into two parts. In the first part, the central experiments which demonstrate NDC in single-molecule junctions are critically reviewed, with emphasis on the main observations and their possible physical origins. The second part is devoted to the theory of NDC in single-molecule junctions, where simple models are employed to shed light on the different possible mechanisms leading to NDC.

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“…In particular, the presence of a transition metal ion allows the tuning of the electronic transport through well-defined charge and possibly spin states of the molecular species. Recent experimental work on charge transport in transition metal coordination complexes revealed a rich physics including inelastic tunneling effects, negative differential resistance and Kondo resonances3235. The case for transition metal coordination complexes is thus twofold.…”

mentioning

confidence: 99%

Charge and spin transport in single and packed ruthenium-terpyridine molecular devices: Insight from first-principles calculations

Morari

Buimaga-Iarinca

Rungger

et al. 2016

Sci Rep

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Using first-principles calculations, we study the electronic and transport properties of rutheniumterpyridine molecules sandwiched between two Au(111) electrodes. We analyse both single and packed molecular devices, more amenable to scaling and realistic integration approaches. The devices display all together robust negative differential resistance features at low bias voltages. Remarkably, the electrical control of the spin transport in the studied systems implies a subtle distribution of the magnetisation density within the biased devices and highlights the key role of the Au(111) electrical contacts.

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Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions

Cited by 30 publications

References 62 publications

Measurement and control of detailed electronic properties in a single molecule break junction

Measurement and control of detailed electronic properties in a single molecule break junction

Negative differential conductance in molecular junctions: an overview of experiment and theory

Charge and spin transport in single and packed ruthenium-terpyridine molecular devices: Insight from first-principles calculations

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