Electrical conduction through self-assembled monolayers in molecular junctions: Au/molecules/Au versus Au/molecule/PEDOT:PSS/Au

Yoo, Hana; Na, Seok In; Kim, Tae Wook; Cho, Byungjin; Kim, Dong Yu; Lee, Takhee

doi:10.1016/j.tsf.2009.07.094

Cited by 28 publications

(55 citation statements)

References 20 publications

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“…Since PEDOT can act as a conducting material, direct tunneling characteristics through the molecular junction were observed, similar to those in other M 3 architectures [112][113][114][115]. This process looks promising to prevent penetration of vaporized metal penetration and provide high yields of molecular devices for large scale device manufacturing, although some inconsistencies in electronic characteristics are pointed out that arise from a comparison between polymer/SAM and Au/SAM interfaces [116,117]. Further studies of the conductive polymer/SAM interface is desired in order to understand better the dependencies of the interface characteristics, morphology, and conductance on the SAM functional groups [118].…”

Section: Plugging Of Defect Pinholes With Polymerssupporting

confidence: 57%

Issues and Challenges in Vapor-Deposited Top Metal Contacts for Molecule-Based Electronic Devices

Maitani

2011

Unimolecular and Supramolecular Electronics I

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Metal vapor deposition to form ohmic contacts is commonly used in the fabrication of organic electronic devices because of significant manufacturability advantages. In the case of single molecular layer devices, however, the extremely small thickness, typically ~1-2nm, presents serious challenges in achieving good contacts and device integrity. This review focuses on recent scientific aspects of metal vapor deposition on monolayer thickness molecular films, particularly self-assembled monolayers, ranging across mechanisms of metal nucleation, metal-molecular group interactions and chemical reactions, diffusion of metal atoms within and through organic films, and the correlations of these and other factors with device function. Results for both non-reactive and reactive metal deposition are reviewed. Finally, novel strategies are considered which show promise for providing highly reliable and durable metal/organic top contacts for use in metal-molecule-metal junctions for device applications.

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Section: Plugging Of Defect Pinholes With Polymerssupporting

confidence: 57%

Issues and Challenges in Vapor-Deposited Top Metal Contacts for Molecule-Based Electronic Devices

Maitani

2011

Unimolecular and Supramolecular Electronics I

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“…We, and others, 50,[56][57][58][59][60][61][62][63][64][65][66][67][68] have begun an effort to develop and prove reliable protocols for measuring charge transport across SAMs. Our approach features a semiconformal (mechanically compliant on the micron-scale but probably not conformal on smaller scales) liquid top-electrode, EGaIn (a liquid eutectic alloy of gallium and indium), whose surface is largely, or entirely, covered with a thin oxide film (predominantly gallium oxide).…”

Section: Introductionmentioning

confidence: 99%

Odd−Even Effects in Charge Transport across Self-Assembled Monolayers

et al. 2011

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This paper compares charge transport across self-assembled monolayers (SAMs) of nalkanethiol containing odd and even numbers of methylenes. Ultraflat template-stripped silver (Ag TS ) surfaces supported the SAMs, while top-electrodes of eutectic galliumindium (EGaIn) contacted the SAMs to form metal/SAM//oxide/EGaIn junctions. TheEGaIn spontaneously reacts with ambient oxygen to form a thin (~ 2 nm) oxide layer.This oxide layer enabled EGaIn to maintain a stable, conical shape (convenient for forming microcontacts to SAMs) while retaining the ability to deform and flow upon contacting a hard surface. Conical electrodes of EGaIn conform (at least partially) to 2 SAMs, and generate high yields of working junctions. Ga 2 O 3 /EGaIn top electrodes enable the collection of statistically significant numbers of data in convenient periods of time. The observed difference in charge transport between n-alkanethiols with odd-and even-numbers of methylenes -the "odd-even effect" -is statistically discernable using these junctions, and demonstrates that this technique is sensitive to small differences in the structure and properties of the SAM. Alkanethiols with an even number of methylenes exhibit the expected exponential decrease in current density (J) with increasing chain length, as do alkanethiols with an odd number of methylenes. This trend disappears, however, when the two datasets are analyzed together; alkanethiols with an even number of methylenes typically show higher J than homologous alkanethiols with an odd number of methylenes. The precision of the present measurements, and the statistical power of the present analysis, were only sufficient to identify, with statistical confidence, the difference between an odd and even number of methylenes with respect to J, but not with respect to the tunneling decay constant, β, or the pre-exponential factor, J 0 .3

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“…Since a conceptual model for a molecular rectifier was first proposed in 1974, molecular electronic devices, which utilize molecules as electronic device components, have been widely studied for use in rectifiers, transistors, switches, and memories . However, any functional molecular monolayer devices are hardly practical because a typical vertically structured molecular device has a very low device yield (< ∼1%) owing to electrical shorts that may occur as a result of the top electrode's penetration through the thin molecular layers . Single‐molecule devices, however, are prone to large fluctuations of their properties due to lack of control of positioning the molecules with atomic precision into electrodes and are suffering from the low conductance of these devices.…”

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confidence: 99%

“…After finishing the SAM deposition, the samples were exposed to UV handed lamp capable of generating 312 nm UV light or visible‐light lamp (fluorescent lamp) in a dark room for 1 hour to induce the closed or open states of the molecules, respectively. To fabricate the molecular devices, we used a conducting polymer, PEDOT:PSS ((poly‐(3,4‐ethylenedioxythiophene) stabilized with poly‐(4‐styrenesulfonic acid)) in a process that was first introduced by Akkerman et al The device yield for a simple metal/molecule/metal junction, without PEDOT:PSS was found to be as low as ∼1% . The PEDOT:PSS layer serves as an interlayer electrode between the molecular layer and the metal and minimizes the electrical shorting problem .…”

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confidence: 99%

Flexible Molecular‐Scale Electronic Devices Composed of Diarylethene Photoswitching Molecules

et al. 2014

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The electrical properties of diarylethene photoswitching molecular devices on flexible substrates are studied. When exposed to UV or visible light, diarylethene molecular devices show two electrical states (a high and a low conductance state) with a discrepancy of an order of magnitude in the level of current between the two states. The diarylethene flexible molecular devices exhibit excellent long‐time stability and reliable electrical characteristics in both conductance states when subjected to various mechanical stresses.

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Electrical conduction through self-assembled monolayers in molecular junctions: Au/molecules/Au versus Au/molecule/PEDOT:PSS/Au

Cited by 28 publications

References 20 publications

Issues and Challenges in Vapor-Deposited Top Metal Contacts for Molecule-Based Electronic Devices

Issues and Challenges in Vapor-Deposited Top Metal Contacts for Molecule-Based Electronic Devices

Odd−Even Effects in Charge Transport across Self-Assembled Monolayers

Flexible Molecular‐Scale Electronic Devices Composed of Diarylethene Photoswitching Molecules

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