Contacting organic molecules by metal evaporation

Haick, Hossam; Ambrico, M.; Ghabboun, Jamal; Cahen, David

doi:10.1039/b411490f

Cited by 64 publications

(73 citation statements)

References 24 publications

(38 reference statements)

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“…[68,69] If Pd was used instead of Au, no such inversion was observed. [68,70] This striking difference was attributed to the difference in growth mechanisms of the Pd and Au films, viz., two dimensional and three dimensional growth, respectively, that leads to differences in the interaction of the metal with the molecules. [69] Finally, it is well-known that a dipole at a semiconductor-insulator interface of a metal/insulator/semiconductor junction will change the threshold voltage of a field effect transistor based on this structure.…”

Section: Progress Reportmentioning

confidence: 97%

Electrostatic Properties of Ideal and Non‐ideal Polar Organic Monolayers: Implications for Electronic Devices

et al. 2007

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Molecules in (or as) electronic devices are attractive because the variety and flexibility inherent in organic chemistry can be harnessed towards a systematic design of electrical properties. Specifically, monolayers of polar molecules introduce a net dipole, which controls surface and interface barriers and enables chemical sensing via dipole modification. Due to the long range of electrostatic phenomena, polar monolayer properties are determined not only by the type of molecules and/or bonding configuration to the substrate, but also by size, (dis‐)order, and adsorption patterns within the monolayer. Thus, a comprehensive understanding of polar monolayer characteristics and their influence on electronic devices requires an approach that transcends typical chemical designs, i.e., one that incorporates long‐range effects, in addition to short‐range effects due to local chemistry. We review and explain the main uses of polar organic monolayers in shaping electronic device properties, with an emphasis on long‐range cooperative effects and on the differences between electrical properties of uniform and non‐uniform monolayers.

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Section: Progress Reportmentioning

confidence: 97%

Electrostatic Properties of Ideal and Non‐ideal Polar Organic Monolayers: Implications for Electronic Devices

et al. 2007

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“…Conventional metal deposition techniques such as evaporation, sputtering, and chemical vapor deposition bring considerable energy to the surface during the deposition process and are known to damage the surface molecular layer 271,272 and result in metalorganic interfaces with inconsistent, inhomogeneous, and leaky electrical conducting properties. 273,274 To minimize the impact of the metallization process, "soft" techniques, such as indirect deposition, [275][276][277] nano-particles deposition, [278][279][280] electrochemical methods, [281][282][283] "lift-off float-on (LOFO)," 284,285 mercury droplet contacts, 286,287 micro-contact printing, [288][289][290][291] have been specially designed and implemented to achieve more consistent results. The effect of a molecular layer on the SBH is found to be less consistent and predictable than its effect on the surface potential of the semiconductor or the metal.…”

Section: Dv¼mentioning

confidence: 99%

The physics and chemistry of the Schottky barrier height

Tung

2014

Applied Physics Reviews

1,039

479

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The formation of the Schottky barrier height (SBH) is a complex problem because of the dependence of the SBH on the atomic structure of the metal-semiconductor (MS) interface. Existing models of the SBH are too simple to realistically treat the chemistry exhibited at MS interfaces. This article points out, through examination of available experimental and theoretical results, that a comprehensive, quantum-mechanics-based picture of SBH formation can already be constructed, although no simple equations can emerge, which are applicable for all MS interfaces. Important concepts and principles in physics and chemistry that govern the formation of the SBH are described in detail, from which the experimental and theoretical results for individual MS interfaces can be understood. Strategies used and results obtained from recent investigations to systematically modify the SBH are also examined from the perspective of the physical and chemical principles of the MS interface.

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“…Different methods have been proposed for the deposition of the top contact, ranging from direct [10] and indirect [11] physical vapor deposition (PVD), conducting polymer [12,13] or graphene protective layers [14] to more exotic deposition methods, such as micro-contact printing [15,16] or single gold crystals. [17] Each of these approaches has drawbacks, be it low yield, significant added series resistance, or a serial fabrication approach preventing cost-efficient large-scale integration.…”

Section: Current State: Electrical Characterization Of Alkane-dithiolmentioning

confidence: 99%

Functional Nanopores: A Solid-state Concept for Artificial Reaction Compartments and Molecular Factories

Puebla‐Hellmann¹,

Mayor

Lörtscher

2016

Chimia

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On the road towards the long-term goal of the NCCR Molecular Systems Engineering to create artificial molecular factories, we aim at introducing a compartmentalization strategy based on solid-state silicon technology targeting zeptoliter reaction volumes and simultaneous electrical contact to ensembles of well-oriented molecules. This approach allows the probing of molecular building blocks under a controlled environment prior to their use in a complex molecular factory. Furthermore, these ultra-sensitive electrical conductance measurements allow molecular responses to a variety of external triggers to be used as sensing and feedback mechanisms. So far, we demonstrate the proof-of-concept by electrically contacting selfassembled mono-layers of alkane-dithiols as an established test system. Here, the molecular films are laterally constrained by a circular dielectric confinement, forming a so-called 'nanopore'. Device yields above 85% are consistently achieved down to sub-50 nm nanopore diameters. This generic platform will be extended to create distributed, cascaded reactors with individually addressable reaction sites, including interconnecting microfluidic channels for electrochemical communication among nanopores and sensing sites for reaction control and feedback. In this scientific outlook, we will sketch how such a solid-state nanopore concept can be used to study various aspects of molecular compounds tailored for operation in a molecular factory.

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Contacting organic molecules by metal evaporation

Cited by 64 publications

References 24 publications

Electrostatic Properties of Ideal and Non‐ideal Polar Organic Monolayers: Implications for Electronic Devices

Electrostatic Properties of Ideal and Non‐ideal Polar Organic Monolayers: Implications for Electronic Devices

The physics and chemistry of the Schottky barrier height

Functional Nanopores: A Solid-state Concept for Artificial Reaction Compartments and Molecular Factories

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