Charge transfer complexation boosts molecular conductance through Fermi level pinning

Wang, Kun; Vezzoli, Andrea; Grace, Iain; McLaughlin, Maeve; Nichols, Richard J.; Xu, Bingqian; Lambert, Colin J.; Higgins, Simon J.

doi:10.1039/c8sc04199g

Cited by 51 publications

(37 citation statements)

References 68 publications

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“…We also note that this resonance in the transmission spectra has a line-shape of the Breit-Wigner distribution. [34][35][36] The transmission for carbocation states at the Fermi level is more than one order of magnitude higher than that for MGOH, which is in good agreement with the experimental observation. Fig.…”

Section: Resultssupporting

confidence: 87%

Photo-induced carbocation-enhanced charge transport in single-molecule junctions

et al. 2020

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Section: Resultssupporting

confidence: 87%

Photo-induced carbocation-enhanced charge transport in single-molecule junctions

et al. 2020

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“…[5] One challenging area in molecular electronics is the achievement of high and controllable conductance in singlemolecule wires. [6] According to Landauer theory, [7] the conductance G 0 of the quantum point contact follows the equation…”

Section: Introductionmentioning

confidence: 99%

“…As a basic research topic in molecular electronics, single‐molecule wires are essential components for molecular devices and can provide a fundamental understanding for electron transport in single molecules or molecular assemblies, which can lead to advancements in chemistry, biology and materials science . One challenging area in molecular electronics is the achievement of high and controllable conductance in single‐molecule wires . According to Landauer theory, the conductance G 0 of the quantum point contact follows the equation

true G_{0} = \frac{2 e}{h} \sum_{n = 1}^{N} T_{n}

…”

Section: Introductionmentioning

confidence: 99%

Achieving Efficient Multichannel Conductance in Through‐Space Conjugated Single‐Molecule Parallel Circuits

et al. 2020

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Constructing single‐molecule parallel circuits with multiple conduction channels is an effective strategy to improve the conductance of a single molecular junction, but rarely reported. We present a novel through‐space conjugated single‐molecule parallel circuit (f‐4Ph‐4SMe) comprised of a pair of closely parallelly aligned p‐quaterphenyl chains tethered by a vinyl bridge and end‐capped with four SMe anchoring groups. Scanning‐tunneling‐microscopy‐based break junction (STM‐BJ) and transmission calculations demonstrate that f‐4Ph‐4SMe holds multiple conductance states owing to different contact configurations. When four SMe groups are in contact with two electrodes at the same time, the through‐bond and through‐space conduction channels work synergistically, resulting in a conductance much larger than those of analogous molecules with two SMe groups or the sum of two p‐quaterphenyl chains. The system is an ideal model for understanding electron transport through parallel π‐stacked molecular systems and may serve as a key component for integrated molecular circuits with controllable conductance.

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“…3 b. The response time [ 38 , 39 ] ( τ ris representing the time gap from the 90% current peak to the 10% current peak) is determined as 1.8 s, while the recovery time ( τ rec defined oppositely) is 2.4 s, which are nearly a constant in the entire temperature range. For 10 K and 20 K, the delay time of the “tail” structure is about 15.7 s, which is surprisingly absent when the illumination of LED current is smaller than 500 μA.…”

Section: Resultsmentioning

confidence: 99%

Photoelectronic Properties of End-bonded InAsSb Nanowire Array Detector under Weak Light

et al. 2021

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A simple fabrication of end-bonded contacts InAsSb NW (nanowire) array detector to weak light is demonstrated in this study. The detector is fabricated using InAsSb NW array grown by molecular beam epitaxy on GaAs substrate. The metal-induced gap states are induced by the end-bonded contact which suppresses the dark current at various temperatures. The existence of the interface dipole due to the interfacial gap states enhances the light excitation around the local field and thus upgrades the photoresponsivity and photodetectivity to the weak light. The light intensity of the infrared light source in this report is 14 nW/cm2 which is about 3 to 4 orders of magnitude less than the laser source. The responsivity of the detector has reached 28.57 A/W at room temperature with the light (945 nm) radiation, while the detectivity is 4.81 × 1011 cm·Hz1/2 W−1. Anomalous temperature-dependent performance emerges at the variable temperature experiments, and we discussed the detailed mechanism behind the nonlinear relationship between the photoresponse of the device and temperatures. Besides, the optoelectronic characteristics of the detector clarified that the light-trapping effect and photogating effect of the NWs can enhance the photoresponse to the weak light across ultraviolet to near-infrared. These results highlight the feasibility of the InAsSb NW array detector to the infrared weak light without a cooling system.

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Charge transfer complexation boosts molecular conductance through Fermi level pinning

Abstract: Efficient charge transport across long molecular wires enabled by charge-transfer complexation, through Fermi level pinning of interference features.

Cited by 51 publications

References 68 publications

Photo-induced carbocation-enhanced charge transport in single-molecule junctions

Photo-induced carbocation-enhanced charge transport in single-molecule junctions

Achieving Efficient Multichannel Conductance in Through‐Space Conjugated Single‐Molecule Parallel Circuits

Photoelectronic Properties of End-bonded InAsSb Nanowire Array Detector under Weak Light

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