Rectifying characteristics of Mg|(C16H33-Q3CNQ LB film)|Pt structures

Ashwell, Geoffrey J.; Sambles, J. R.; Martin, Aimée; Parker, William G.; Szablewski, Marek

doi:10.1039/c39900001374

Cited by 165 publications

(173 citation statements)

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“…The Au/n-Si/TDA/Au and Au/p-Si/ODM/ Au diodes were fabricated using n-type and p-type single side polished single crystal silicon wafer with h1 0 0i surface orientations, 0.53 lm thick, 100 mm diameter and 2.0 X cm resistivity, purchased from Si-Mat Silicon Wafers Company, CZ. The Si wafers were cleaned in boiling trichloroethylene, acetone and ethanol for by 10 films and 1 mM SAM (TDA and ODM) solutions were prepared in ethanol. An n-type Si substrate was dipped into 1 mM TDA-ethanol solution, while a p-type Si substrate was dipped into 1 mM ODMethanol solution and kept them 72 h inside to form SAM monolayer on the substrates.…”

Section: Methodsmentioning

confidence: 99%

“…The controlling metal-semiconductor contacts can be achieved by inserting monolayers of systematically varying molecules at their interfaces [1][2][3][4]. Organic monolayers have been used for several potential electronic applications such as molecular switches [5,6] and memory cells [7,8] molecular rectifying diodes [9][10][11][12][13][14][15]. When organic SAM molecules are grafted on semiconductor surface, this process modifies the electrical potential at the interface.…”

Section: Introductionmentioning

confidence: 99%

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Modification of metal/semiconductor junctions by self-assembled monolayer organic films

Yakuphanoğlu

Okur

Özgener

2009

Microelectronic Engineering

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a b s t r a c tTwo new metal/molecule/semiconductor contacts, Au/n-Si/TDA/Au and Au/p-Si/ODM/Au, were fabricated to understand effect of organic compounds, tridecylamine and octadecylmercaptan self-assembled monolayer (SAM) films, on electrical charge transport properties of the metal/semiconductor junctions. The morphology of the organic monolayers deposited on Si substrates was investigated by atomic force microscopy. The molecular coverage of ODM deposited on p-Si is poorer than that of TDA on n-Si substrate. The ideality factors of the p-Si/ODM and n-Si/TDA diodes were found to be 1.66 and 1.48, respectively. The electrical results show that the tridecylamine monolayer passivated junction has a lower ideality factor. The ideality factor indicates clear dependence on two different type functional groups R-SH (Thiol) and R-NH 2 (Amin) groups and it increases with different functional groups of organic molecule. The barrier height u b value of the n-Si/TDA diode is smaller than that of p-Si/ODM diode, as a result of chain length of the SAM organic molecules. The interface state density D it values of the diodes were determined using conductance technique. The n-Si/TDA diode has the smaller interface state density according to p-Si/ODM diode.We have evaluated that the organic molecules control the electronic parameters of metal/semiconductor diodes and thus, organic modification helps to get one step closer towards to new organic assisted silicon based microelectronic devices.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of metal/semiconductor junctions by self-assembled monolayer organic films

Yakuphanoğlu

Okur

Özgener

2009

Microelectronic Engineering

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“…Langmuir-Blodgett (LB) monolayers (see a review in a textbook [4]) have also been used in the fabrication of molecularbased devices [22][23][24][25][26][27][28][29][30][31][32][33], but they are less robust (mechanically and thermally) than SAMs, and chemisorption processes are now more systematically used, both for making monolayers and to attach a single molecule between nano-electrodes. Sublimation of molecules (depending on molecules) can also be used in a sub-monolayer regime especially for UHV-STM studies.…”

Section: Chemistry and Self-assemblymentioning

confidence: 99%

Molecular Nanoelectronics

Vuillaume

2010

Proc. IEEE

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Abstract-Molecular electronics is envisioned as a promising candidate for the nanoelectronics of the future. More than a possible answer to ultimate miniaturization problem in nanoelectronics, molecular electronics is foreseen as a possible way to assemble a large numbers of nanoscale objects (molecules, nanoparticules, nanotubes and nanowires) to form new devices and circuit architectures. It is also an interesting approach to significantly reduce the fabrication costs, as well as the energetical costs of computation, compared to usual semiconductor technologies. Moreover, molecular electronics is a field with a large spectrum of investigations: from quantum objects for testing new paradigms, to hybrid molecular-silicon CMOS devices. However, problems remain to be solved (e.g. a better control of the molecule-electrode interfaces, improvements of the reproducibility and reliability, etc…).

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“…[1][2][3][4] The long chain quinolinium tricyanoquinodimethanide (Q3CNQ) molecule (typically C 16 H 33 -γ Q3CNQ) is of special interest as it is the first experimentally reported example of a current rectifier when arranged as a multilayer Langmuir-Blodgett (LB) film. 5,6 The molecule is often claimed to possess the D + -π -A − ↔D 0 -π -A 0 (D-electron donor, A-electron acceptor, π -conjugated π bond link; superscripts indicate charge polarity) resonance structure suggesting that it is the asymmetry of the electronic density that is the origin of molecular rectification. The ground state is commonly regarded as "zwitterionic" with a nonzero dihedral twisting angle between the donor and acceptor aromatic ring planes.…”

Section: Introductionmentioning

confidence: 99%

Understanding the optical spectroscopy of amphiphilic molecular rectifiers: A density functional approach

Tan¹,

Clark²,

Szablewski³

et al. 2010

The Journal of Chemical Physics

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We present results of first principles density functional theory calculations of the electronic and atomic structural properties of model Z-type Langmuir-Blodgett (LB) layers comprising amphiphilic quinolinium tricyanoquinodimethanide (Q3CNQ) chromophores. We find that the chromophore electronic ground state is not as clearly "zwitterionic" as required by models to explain electrical rectification purportedly seen in such systems. The computed visible region transitions are not what have been assumed to be the intervalence charge transfer bands seen in the visible region of molecules in Z-type LB films. Our own LB deposition and spectroscopic studies suggest that almost all visible region features previously seen may be ascribed to aggregates. The calculated lowest energy electronic excitation between HOMO and LUMO levels, which is located in the near infrared region, has a transition moment aligned approximately 9 • off the molecular long axis, and has a normalized oscillator strength of 1 order of magnitude higher than those of the visible region transitions. This most dominant feature has been neglected from discussions of Langmuir-Blodgett layer rectification but our own deposition studies show no sign of this feature, indicating that the structure of the modeled system differs from that of typical experimental structures. The model indicates that such idealized LB layer structures cannot confidently be invoked to explain their experimental optical or electrical properties.

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Rectifying characteristics of Mg|(C16H33-Q3CNQ LB film)|Pt structures

Cited by 165 publications

References 10 publications

Modification of metal/semiconductor junctions by self-assembled monolayer organic films

Modification of metal/semiconductor junctions by self-assembled monolayer organic films

Molecular Nanoelectronics

Understanding the optical spectroscopy of amphiphilic molecular rectifiers: A density functional approach

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