Organization of Charge‐Carrier Pathways for Organic Electronics

Kastler, Marcel; Pisula, Wojciech; Laquai, Frédéric; Kumar, Avinesh; Davies, Richard J.; Baluschev, Stanislav; García-Gutiérrez, Mari Cruz; Wasserfallen, Daniel; Butt, Hans‐Jürgen; Riekel, Christian; Wegner, Gerhard; Müllen, Kläus

doi:10.1002/adma.200601177

Cited by 79 publications

(69 citation statements)

References 28 publications

(26 reference statements)

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“…The time-of-flight (TOF) results revealed that the quality of the organization (columnar assemblies) and the molecular orientation (''face on'' and ''edge on'') is crucial for the charge-carrier mobility. [88] This proves that supramolecular organization is electronically relevant and emphasizes that PAHs are promising candidates for implementation in organic electronics. Nevertheless, the choice of the processing techniques is a key-step in the utilization of organic molecules in devices.…”

Section: Variation Of the Corementioning

confidence: 90%

Polyphenylene‐Based Materials: Control of the Electronic Function by Molecular and Supramolecular Complexity

2009

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Organic electronics is one of the hottest and most exciting research topics today. However, its performance still lags behind that of inorganic‐based electronics. This Progress Report demonstrates that by controlling the complexity of organic molecules at the molecular and at the supramolecular level as well as by choosing suitable processing techniques, the desired function for applications in electronics can be achieved. Our main focus is on polyphenylene‐based nanomaterials, versatile organic molecules that allow access to novel intricate materials. We emphasize the molecular complexity as well as the supramolecular organization and the interfacing of novel organic materials as key guidelines.

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Section: Variation Of the Corementioning

confidence: 90%

Polyphenylene‐Based Materials: Control of the Electronic Function by Molecular and Supramolecular Complexity

2009

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“…Typically, a dispersive transport is obtained for low-ordered films, while a non-dispersive photocurrent is determined for perfectly aligned structures indicating reduced charge trapping. [53] It has to be emphasized that a homeotropic phase on only one surface was reported in only a few cases, which opens the possibility of practical application in photovoltaics.…”

Section: à4mentioning

confidence: 99%

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

Pisula¹,

Zorn²,

Chang³

et al. 2009

Macromol. Rapid Commun.

369

276

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Organic semiconducting materials offer the advantage of solution processability into flexible films. In most cases, their drawback is based on their low charge carrier mobility, which is directly related to the packing of the molecules both on local (amorphous versus crystalline) and on macroscopic (grain boundaries) length scales. Liquid crystalline ordering offers the possibility of circumventing this problem. An advanced concept comprises: i) the application of materials with different liquid crystalline phases, ii) the orientation of a low viscosity high temperature phase, and, iii) the transfer of the macroscopic orientation during cooling to a highly ordered (at best, crystalline-like) phase at room temperature. At the same time, the desired orientation for the application (OLED or field-effect transistor) can be obtained. This review presents the use of molecules with discotic, calamitic and sanidic phases and discusses the sensitivity of the phases with regard to defects depending on the dimensionality of the ordered structure (columns: 1D, smectic layers and sanidic phases: 2D). It presents ways to systematically improve charge carrier mobility by proper variation of the electronic and steric (packing) structure of the constituting molecules and to reach charge carrier mobilities that are close to and comparable to amorphous silicon, with values of 0.1 to 0.7 cm(2) · V(-1) · s(-1) . In this context, the significance of cross-linking to stabilize the orientation and liquid crystalline behavior of inorganic/organic hybrids is also discussed.

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“…[48] Da diese üblicherweise keine intrinsischen Ladungen enthalten, wurden Ladungen durch Dotieren oder durch Photoprozesse erzeugt. Vaughan und Mitarbeiter [49] [54] in der aber eine Domänenbildung auftritt, die wiederum zu Ladungsfallen an den Domänen- [56] Mit einem quantenchemischen Ansatz wurden die für hohe Ladungsträgerbeweglichkeit erforderlichen Molekül-merkmale in Triphenylen, Hexaazatriphenylen, Hexaazatrinaphthylen und Hexa-peri-hexabenzocoronen (Schema 1 und 37) auf der Grundlage berechneter Struktur-EigenschaftsBeziehungen [57] …”

Section: Elektrische Leitfähigkeitunclassified

Diskotische Flüssigkristalle: Von der maßgeschneiderten Synthese zur Kunststoffelektronik

et al. 2007

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Die meisten Menschen verbinden mit dem Begriff Flüssigkristalle sofort die Displays von Laptop‐Computern, Mobiltelefonen, Digitalkameras und anderen elektronischen Geräten. Im Unterschied zu ihren stäbchenförmigen (calamitischen) Verwandten, die erstmals 1907 von Vorländer beschrieben wurden, bieten aber die 1977 von Chandrasekhar entdeckten scheibenförmigen (diskotischen) Flüssigkristalle andere vielversprechende Verwendungsmöglichkeiten. Ihre einzigartige Anordnung in columnaren Mesophasen macht sie zu idealen Kandidaten für molekulare Drähte in vielen optischen und elektronischen Geräten, beispielsweise in Photokopierern, Laserdruckern, Solarzellen, organischen Leuchtdioden und Feldeffekttransistoren oder zur holographischen Datenspeicherung. Einer Übersicht über die verschiedenen Mesophasentypen und Charakterisierungsmethoden columnarer Flüssigkristalle folgen ausgewählte Beispiele aus den Hauptklassen columnarer Mesogene unter besonderer Berücksichtigung effizienter Syntheseverfahren, mesomorpher Eigenschaften und der für Anwendungen relevanten physikalischen Eigenschaften der Flüssigkristalle. Abschließend werden Anwendungsbeispiele und Perspektiven für einen Einsatz in den Materialwissenschaften und der molekularen Elektronik vorgestellt.

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Organization of Charge‐Carrier Pathways for Organic Electronics

Cited by 79 publications

References 28 publications

Polyphenylene‐Based Materials: Control of the Electronic Function by Molecular and Supramolecular Complexity

Polyphenylene‐Based Materials: Control of the Electronic Function by Molecular and Supramolecular Complexity

Liquid Crystalline Ordering and Charge Transport in Semiconducting Materials

Diskotische Flüssigkristalle: Von der maßgeschneiderten Synthese zur Kunststoffelektronik

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