Gated-Controlled Rectification of a Self-Assembled Monolayer-Based Transistor

Mentovich, Elad; Rosenberg-Shraga, Natalie; Kalifa, Itshak; Gozin, Michael; Mújica, Vladimiro; Hansen, Thorsten; Richter, Shachar

doi:10.1021/jp311875g

Cited by 38 publications

(39 citation statements)

References 54 publications

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“…We have reported before molecular diodes based on SAMs of S(CH 2 ) 11 Fc in junctions of the form of Ag‐S(CH 2 ) 11 Fc//GaO x /eutectic alloy of gallium and indium (EGaIn) where “‐,” “//,” and “/” denote a covalent interaction, noncovalent interaction, and the interface between GaO x and EGaIn (Figure ), respectively. These diodes have large rectification ratios of 1.0 × 10 2 ; we have systematically studied the mechanism of charge transport across this diode in detail and our results have been confirmed by others . The HOMO is centered on the Fc unit and positioned asymmetrically inside the junction.…”

supporting

confidence: 81%

Stable Molecular Diodes Based on π–π Interactions of the Molecular Frontier Orbitals with Graphene Electrodes

et al. 2018

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In molecular electronics, it is important to control the strength of the molecule-electrode interaction to balance the trade-off between electronic coupling strength and broadening of the molecular frontier orbitals: too strong coupling results in severe broadening of the molecular orbitals while the molecular orbitals cannot follow the changes in the Fermi levels under applied bias when the coupling is too weak. Here, a platform based on graphene bottom electrodes to which molecules can bind via π-π interactions is reported. These interactions are strong enough to induce electronic function (rectification) while minimizing broadening of the molecular frontier orbitals. Molecular tunnel junctions are fabricated based on self-assembled monolayers (SAMs) of Fc(CH ) X (Fc = ferrocenyl, X = NH , Br, or H) on graphene bottom electrodes contacted to eutectic alloy of gallium and indium top electrodes. The Fc units interact more strongly with graphene than the X units resulting in SAMs with the Fc at the bottom of the SAM. The molecular diodes perform well with rectification ratios of 30-40, and they are stable against bias stressing under ambient conditions. Thus, tunnel junctions based on graphene with π-π molecule-electrode coupling are promising platforms to fabricate stable and well-performing molecular diodes.

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supporting

confidence: 81%

Stable Molecular Diodes Based on π–π Interactions of the Molecular Frontier Orbitals with Graphene Electrodes

et al. 2018

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“…Previously, we have reported on the mechanism of charge transfer across molecular diodes with SAMs of SC 11 Fc on ultra-flat template-stripped silver-bottom electrodes (Ag TS ; henceforth left electrode) and EGaIn top electrodes (henceforth right electrode; a non-Newtonian liquid-metal alloy of eutectic In and Ga) [17][18][19] , including temperature-dependent J(V) measurements 20 (others have studied the mechanism rectification of SC n Fc SAMs in other types of junctions [21][22][23] ). This so-called 'EGaIn' technique is well established [24][25][26][27] and has been used in a wide range of physical-organic studies 20,[28][29][30][31][32][33] .…”

Section: Resultsmentioning

confidence: 99%

Controlling the direction of rectification in a molecular diode

et al. 2015

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A challenge in molecular electronics is to control the strength of the molecule-electrode coupling to optimize device performance. Here we show that non-covalent contacts between the active molecular component (in this case, ferrocenyl of a ferrocenyl-alkanethiol self-assembled monolayer (SAM)) and the electrodes allow for robust coupling with minimal energy broadening of the molecular level, precisely what is required to maximize the rectification ratio of a molecular diode. In contrast, strong chemisorbed contacts through the ferrocenyl result in large energy broadening, leakage currents and poor device performance. By gradually shifting the ferrocenyl from the top to the bottom of the SAM, we map the shape of the electrostatic potential profile across the molecules and we are able to control the direction of rectification by tuning the ferrocenyl-electrode coupling parameters. Our demonstrated control of the molecule-electrode coupling is important for rational design of materials that rely on charge transport across organic-inorganic interfaces.

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“…3B), and later the molecules are adsorbed to both electrodes simultaneously. [228][229][230][231][232][233][234] The gap or the trench between the two electrodes is often parallel to the substrate and is prepared by advanced lithography, or electromigration. 228,229 The trench can also be vertical (see Fig.…”

Section: Sandwich / Trenchmentioning

confidence: 99%

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

2017

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We review charge transport across molecular monolayers, which is central to molecular electronics (MolEl), using large-area junctions (NmJ). We strive to provide a wide conceptual overview of three main subtopics. First, a broad introduction places NmJ in perspective to related fields of research and to single-molecule junctions (1mJ) in addition to a brief historical account. As charge transport presents an ultrasensitive probe for the electronic perfection of interfaces, in the second part ways to form both the monolayer and the contacts are described to construct reliable, defect-free interfaces. The last part is dedicated to understanding and analyses of current-voltage (I-V) traces across molecular junctions. Notwithstanding the original motivation of MolEl, I-V traces are often not very sensitive to molecular details and then provide a poor probe for chemical information. Instead, we focus on how to analyze the net electrical performance of molecular junctions, from a functional device perspective. Finally, we point to creation of a built-in electric field as a key to achieve functionality, including nonlinear current-voltage characteristics that originate in the molecules or their contacts to the electrodes. This review is complemented by a another review that covers metal-molecule-semiconductor junctions and their unique hybrid effects.

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Gated-Controlled Rectification of a Self-Assembled Monolayer-Based Transistor

Cited by 38 publications

References 54 publications

Stable Molecular Diodes Based on π–π Interactions of the Molecular Frontier Orbitals with Graphene Electrodes

Stable Molecular Diodes Based on π–π Interactions of the Molecular Frontier Orbitals with Graphene Electrodes

Controlling the direction of rectification in a molecular diode

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

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