The electronic transport properties in C60 molecular devices with different contact distances

Ji, Guomin; Zhai, Yaxin; Fang, Changshui; Xu, Yuqing; Cui, Bin; Liu, Desheng

doi:10.1016/j.physleta.2011.02.058

Physics Letters A

2011

DOI: 10.1016/j.physleta.2011.02.058

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The electronic transport properties in C60 molecular devices with different contact distances

Guomin Ji

Yaxin Zhai

Changshui Fang

et al.

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Cited by 10 publications

(2 citation statements)

References 30 publications

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“…At shorter distances, however, the I(V) curves collected on the An and AnC 60 samples are non‐linear and symmetric, as expected for a single layer device with identical electrode materials (Figure b and Figure S5 in SI) where the deviation from ohmic behavior is due to the presence of a semi‐conducting material between the electrodes. [2c] The shape of the I(V) characteristics obtained for fullerene‐terminated SAMs (Figure b) is in agreement with the experimental study reported by Joachim and co‐workers on Au electrode‐C 60 molecule‐W STM tip molecular junctions and recent theoretical investigation of Ag electrode‐C 60 molecule‐Ag electrode molecular junctions reported by Ji and co‐workers . The superposition of the topography lines taken before and after electrical measurements (Figure ) shows that there is no significant sample drift during I(V) characterization.…”

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confidence: 88%

Probing Lateral Charge Transport in Single Molecule Layers: How Charge is Transported Over Long Distances in Fullerene Self‐Assembled Monolayers

Dubacheva

Devynck

Raffy

et al. 2013

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Self-assembled monolayers (SAMs) are good candidates for electronic molecular devices as they are compatible with fl exible substrates, show reliable fi lm-forming behavior, fi t well with the miniaturization concept and can be easily functionalized by changing the constituent molecular components. [ 1 ] Most studies on the electrical properties of SAMs have focused on the conduction along the molecular axis [ 2 ] even though this is a minor aspect of the electrical transport in SAMs as they are inherently intended to operate through lateral charge transport which instead depends strongly on intermolecular packing. [ 3 ] Several approaches, [ 4 ] some of which are outlined in Figure 1 , have been proposed to study the lateral electrical transport in SAMs. Field-effect transistor devices in which the semiconductor channel is a single sheet of molecules formed on the gate dielectric (SAMFETs, Figure 1 a) are the most common approach and allow the charge carrier mobility to be extracted from the fi eld-dependence of the source-drain current. [ 5 ] In the case of SAMs formed on conductive substrates, the dependence of the domain height on the size of isolated molecular islands as measured by scanning tunneling microscopy (STM, Figure 1 b) provides an indirect assay of intermolecular charge transport between neighboring molecules. [ 6 ] However, these techniques disagree widely on the magnitude and mechanism of charge transport in monolayers, which can range from very high mobility through ballistic charge transport [ 5 ] to low-to-moderate mobility via percolation. [ 7 ] To date, direct probing of the conductivity of a single molecule layer has not been possible due to the diffi culty of achieving good electrical contact without damaging the monolayer and the low currents that are expected in the absence of a fi eld-effect. In this respect, conducting atomic force microscopy (C-AFM, Figure 1 c), is particularly well adapted as the combination of AFM imaging and C-AFM electrical characterization enables separate (in contrast to STM) and simultaneous (in contrast to SAMFETs) investigation of the structure and function of molecular assemblies. [ 2c ] In addition, C-AFM can be used to measure samples with widely varying conductance, while positioning an electrical probe with nanometer scale precision and controlled force, [ 8 ] thus enabling the channel length to be varied in a step-wise fashion down to tens of nanometers. [ 2c ] Several groups have successfully used this technique to study electrical transport in surface-confi ned nanostructures such as semiconductor crystals, [ 8,9 ] DNA molecules, [ 10 ] inorganic [ 11 ] and organic [ 12 ] nanowires, and carbon nanotubes. [ 13 ] However, initial attempts to measure the lateral transport in SAMs using C-AFM were unsuccessful and the weak currents observed were attributed to tunneling between the tip and the fi xed electrode. [ 14 ] Achieving good contact between a monolayer and a metal electrode is critical for electrical measurements. The evaporation of a ...

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confidence: 88%

Probing Lateral Charge Transport in Single Molecule Layers: How Charge is Transported Over Long Distances in Fullerene Self‐Assembled Monolayers

Dubacheva

Devynck

Raffy

et al. 2013

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“…It is well known that the distance between electrodes can strongly affect the electron transport properties of a molecular junction [15,16]. Recent advances in nanofabrication techniques permit a precise control of the gap size in between the SWCNT electrodes [17].…”

mentioning

confidence: 99%

Effects of tip separation and orientation on negative differential resistance in boron-doped carbon-nanotube-based molecular junctions

2012

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We investigate using the Landauer formalism, which combines both the non-equilibrium Green's function and density functional theory, the effects of separation and orientation between two electrodes of boron-doped capped-carbon-nanotube-based molecular junctions on negative differential resistance. The results show that this negative differential resistance behavior is strongly dependent on the separation and orientation between the two electrodes. A gap width of 0.35 nm and maximal symmetry achieves the best negative differential resistance behavior. carbon nanotube, negative differential resistance, non-equilibrium Green function, density functional theory Citation:Zhao P, Liu D S, Liang W. Effects of tip separation and orientation on negative differential resistance in boron-doped carbon-nanotube-based molecular junctions. Chin Sci Bull, 2012, 57: 966969,

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Effect of contact interface configuration on electronic transport in (C20)2-based molecular junctions

Fang

et al. 2012

Physics Letters A

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The electronic transport properties in C60 molecular devices with different contact distances

Cited by 10 publications

References 30 publications

Probing Lateral Charge Transport in Single Molecule Layers: How Charge is Transported Over Long Distances in Fullerene Self‐Assembled Monolayers

Probing Lateral Charge Transport in Single Molecule Layers: How Charge is Transported Over Long Distances in Fullerene Self‐Assembled Monolayers

Effects of tip separation and orientation on negative differential resistance in boron-doped carbon-nanotube-based molecular junctions

Effect of contact interface configuration on electronic transport in (C20)2-based molecular junctions

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