Journal ArticleDOI
Effect of interfaces on the alignment of a discotic liquid-crystalline phthalocyanine.
Vinciane De Cupere,Julien Tant,Pascal Viville,Roberto Lazzaroni,Wojciech Osikowicz,William R. Salaneck,Yves Geerts +6 more
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TLDR
The influence of the nature and number of solid interfaces on the alignment of the columns in a semiconducting discotic liquid crystal is dealt with.Abstract:
This paper deals with the influence of the nature and number of solid interfaces on the alignment of the columns in a semiconducting discotic liquid crystal. The solid substrates have been characterized in terms of their roughness and surface energy. The alignment of the discotic liquid crystal columns on these substrates has been determined by optical microscopy under crossed polarizers and by tapping-mode atomic force microscopy. The nature of the substrates has negligible influence on the alignment. The key parameter is the confinement imposed to the film. These surprising observations are explained by the antagonist alignment role of gas and solid interfaces.read more
Citations
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Discotic liquid crystals: a new generation of organic semiconductors
TL;DR: This critical review covers various aspects of recent research on discotic liquid crystals, in particular, molecular design concepts, supramolecular structure, processing into ordered thin films and fabrication of electronic devices.
Journal ArticleDOI
Discotic Liquid Crystals.
Tobias Wöhrle,Iris Wurzbach,Jochen Kirres,Antonia Kostidou,Nadia Kapernaum,Juri Litterscheidt,Johannes Christian Haenle,Peter Staffeld,Angelika Baro,Frank Giesselmann,Sabine Laschat +10 more
Journal ArticleDOI
Discotic Liquid Crystals for Opto-Electronic Applications †,‡
TL;DR: In this article, the effects of alignment on charge-carrier properties of Discotic Liquid Crystals (DLCs) are discussed, and a detailed overview of the current state of the art is provided.
Journal ArticleDOI
Liquid crystalline ordering and charge transport in semiconducting materials.
TL;DR: This review presents ways to systematically improve charge carrier mobility by proper variation of the electronic and steric structure of the constituting molecules and to reach charge carrier mobilities that are close to and comparable to amorphous silicon.
Journal ArticleDOI
Charge-Carrier Transporting Graphene-Type Molecules
TL;DR: In this article, the thermotropic behavior and supramolecular organization of discotic polycyclic aromatic hydrocarbons (PAHs) in the bulk as well as their self-assembly on the surface at different length scales are discussed in light of various processing approaches from solution that ensure high order and an adequate molecular arrangement in the device configuration.
References
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Journal ArticleDOI
Self-Organized Discotic Liquid Crystals for High-Efficiency Organic Photovoltaics
Lukas Schmidt-Mende,Andreas Fechtenkötter,Klaus Müllen,Ellen Moons,Richard H. Friend,J. D. MacKenzie +5 more
TL;DR: Self-organization of liquid crystalline and crystalline-conjugated materials has been used to create, directly from solution, thin films with structures optimized for use in photodiodes, demonstrating that complex structures can be engineered from novel materials by means of simple solution-processing steps and may enable inexpensive, high-performance, thin-film photovoltaic technology.
Journal ArticleDOI
Fast photoconduction in the highly ordered columnar phase of a discotic liquid crystal
Dieter Adam,Peter Schuhmacher,Jürgen Simmerer,L. Häussling,K. Siemensmeyer,K. H. Etzbachi,Helmut Ringsdorf,Dietrich Haarer +7 more
TL;DR: In this article, it was shown that a highly ordered columnar phase of disk-like organic molecules can exhibit high mobilities for photoinduced charge carriers, of the order of 0.1 cm2 V-1 s-1, higher than for any organic material other than single-crystal phases.
Journal ArticleDOI
Charge transport properties in discotic liquid crystals: a quantum-chemical insight into structure-property relationships.
Vincent Lemaur,Demetrio A. da Silva Filho,Veaceslav Coropceanu,Matthias Lehmann,Yves Geerts,Jorge Piris,Michael G. Debije,Anick M van de Craats,Kittusamy Senthilkumar,Laurens D. A. Siebbeles,J. M. Warman,Jean-Luc Brédas,Jérôme Cornil +12 more
TL;DR: A significant increase in the charge mobility when going from triphenylene to hexaazatrinaphthylene is predicted; this finding has been confirmed by measurements carried out with the pulse-radiolysis time-resolved microwave conductivity technique.
Journal ArticleDOI
Meso-epitaxial solution-growth of self-organizing discotic liquid-crystalline semiconductors
A. M. van de Craats,N. Stutzmann,Oliver Bunk,Martin Nielsen,Mark D. Watson,Klaus Müllen,Henri Chanzy,Henning Sirringhaus,Richard H. Friend +8 more
Journal ArticleDOI
From graphite molecules to columnar superstructures - an exercise in nanoscience
TL;DR: In this paper, the authors describe the preparation of large, yet well-defined, nanoscale polycyclic aromatic hydrocarbons (PBAHs), which then self-assemble to highly ordered, supramolecular arrays with advantageous electronic properties.