Supramolecular electronics; nanowires from self-assembled π-conjugated systems

Schenning, Albertus P. H. J.; Meijer, E. W.

doi:10.1039/b501804h

Cited by 771 publications

(491 citation statements)

References 85 publications

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“…The last feature is related to the supramolecular organization of TTFs to provide electroactive assemblies such as gels, wires, fibers, ribbons, 72 which could be envisaged as components for molecular electronic devices. 73 Another interesting direction of investigation, arising from the combination of the two parallel strategies developed so far in the area of radical cation salts, e.g. use of chiral donors with achiral anions or achiral donors with chiral anions, would consist in the preparation of crystalline materials based on both chiral donors and anions, the latter possibly provided with magnetic properties, as multifunctional systems where magneto-chiral effects could be expressed at different levels.…”

Section: Discussionmentioning

confidence: 99%

Strategies towards chiral molecular conductors

Avarvari¹,

Wallis²

2009

J. Mater. Chem.

123

144

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Introduction of chirality into conducting systems is a topic of much current interest as it allows the preparation of multifunctional materials in which the chirality may modulate the structural disorder or expresses its influence through the electrical magneto-chiral anisotropy effect. The access to various chiral electroactive precursors for molecular conductors is therefore of paramount importance. Different families of chiral tetrathiafulvalene (TTF) derivatives are reviewed together with the corresponding synthetic strategies. Systems based on stereogenic carbon or sulfur atoms, axial and supramolecular chirality have been developed. In other systems the use of achiral TTFs with chiral anions have provided molecular conductors, although in most of them to date the anion is present in racemic form. Starting from some of these precursors several chiral conductors have been prepared and in two cases, involving either chiral TTF-oxazolines salts or BEDT-TTF salts with metal-oxalate anions and chiral solvent molecules, differences between the conductivity of the racemic and enantiopure forms have been found, as a consequence of the structural disorder in the solid state. Further developments in this field are expected to be directed especially towards helical architectures, possibly based on supramolecular chirality, and systems combining conductivity, magnetism and chirality in both organic and inorganic lattices.2

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Section: Discussionmentioning

confidence: 99%

Strategies towards chiral molecular conductors

Avarvari¹,

Wallis²

2009

J. Mater. Chem.

123

144

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“…24,[55][56][57][58] Figure 10 shows a schematic of the nanofiber structure along with a photoluminescence image from our work excited with 532-nm radiation. In crystalline poly(3-hexylthiophene) (P3HT) NFs, the polymer chains are aligned perpendicular to the NF growth axis, with thiophene rings oriented cofacially in adjacent stacks.…”

Section: P3ht Nanofibersmentioning

confidence: 99%

Optical probes of chain packing structure and exciton dynamics in polythiophene films, composites, and nanostructures

Barnes

Baghar

2012

J Polym Sci B Polym Phys

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This mini-review on the photophysics of poly-alkyl thiophenes (e.g., P3HT) and its blends with electron-acceptor moeties such as fullerenes (e.g., PCBM) and carbon nanotubes focuses on highlights of recent literature on spectroscopic probes of exciton formation, diffusion, charge-separation, and transport in these materials. The literature in this area is vast: more than 3000 papers have been published in on P3HT (and related materials) and applications to organic solar energy harvesting devices over the last 20 years. Thus, no single review can capture the breadth and depth of this research. Here, we attempt to highlight some of the exciting new research efforts aimed at understanding photophysical processes in organic photovoltaic materials. This mini-review is organized as follows: First, a summary of the theoretical framework commonly used to describe fundamental physical processes of charge generation in organic (polymeric) semiconductor materials is presented. We then discuss recent exciting results on ultrafast spectroscopic probes of exciton dynamics in these materials. Finally, we present highlights of new research on polymer nanostructures (nanoparticles and nanofibers) and their exciting applications to organic photovoltaics.

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“…[7][8][9][10][11] Self-assembled nanostructures are of fundamental interest for understanding the structure-dependent properties of p-conjugated organic semiconductors. 12,13 Molecular packing in the highly organized onedimensional (1D) nano-structure of organic semiconductors is critical for determining charge transport mechanisms 14 and the rational design of high-performance nano-and micro-electronic devices. However, to clarify the effects of active layer morphology on charge transport in organic semiconductor nano-devices, related studies must be conducted at the nano-scale.…”

Section: Introductionmentioning

confidence: 99%

Charge transport and morphology of pentacene films confined in nano-patterned region

Kim

Jang

et al. 2014

NPG Asia Mater

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The transport and morphology of macroscopic organic transistors have been thoroughly explained. However, the relationship between charge transport and the morphology of organic semiconductors in nano-confined regions is not well understood, which is required to design high-performance nano-electronics. Therefore, in this study, the electrical performance of pentacene thin-film transistors (TFTs) fabricated on nano-scale confined geometries was compared with that of other TFT systems fabricated on micro-scale confined or flat dielectrics. The results showed that the photoresist (PR) reliefs patterned onto silicon dioxide (SiO 2 ) dielectrics could control the growth mode of pentacene in the confined regions. As the line spacing between the PR patterns decreased to below the average size of pentacene normally grown on SiO 2 dielectrics (B1.7 lm), field-effect mobility (l FET ) of pentacene TFTs improved considerably. Specifically, the l FET values for the 250 nm patterned dielectric system were as high as 0.33 cm 2 V À1 s À1 , which was greater than those of the wider-patterned PR or flat dielectric systems (p 0.15 cm 2 V À1 s À1 ). These findings were related to the enhancement of charge-carrier transport owing to the anisotropic p-conjugated crystals nucleated from the nano-confined edges, providing important information that can be used in the design of high-performance nano-scale organic electronics.

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Supramolecular electronics; nanowires from self-assembled π-conjugated systems

Cited by 771 publications

References 85 publications

Strategies towards chiral molecular conductors

Strategies towards chiral molecular conductors

Optical probes of chain packing structure and exciton dynamics in polythiophene films, composites, and nanostructures

Charge transport and morphology of pentacene films confined in nano-patterned region

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