Organic Heterojunction Photovoltaic Cells Made of Discotic, Mesogenic Materials

Haßheider, Thomas; Benning, Stephan A.; Lauhof, Marcus W.; Kitzerow, Heinz‐S.; Böck, Harald; Watson, Mark D.; Müllen, Kläus

doi:10.1080/15421400490439103

Cited by 21 publications

(10 citation statements)

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“…One example that is very closely related to that described here is liquid-crystalline tetraester derivatives of perylene, coronene and ovalene 23 that have been used as n-type liquid-crystalline semiconductors for OLEDs and heterojunction solar cells. 24,25 Further relevant transformations may include synthesis of star-shaped derivatives of HBC that are prepared via Sonogashira coupling of the hexaiodo precursor with appropriate alkyl-or alkylaryl-acetylenes. 26 In all such cases, one may expect that utilization of a mixture of reagents will result in the mixtures of products with variable, well-defined compositions, and will thus provide a way for the ''fine-tuning'' of their thermotropic properties.…”

Section: Discussionmentioning

confidence: 99%

Transition temperature engineering of octaalkoxycarbonyl phthalocyanines

et al. 2007

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Section: Discussionmentioning

confidence: 99%

Transition temperature engineering of octaalkoxycarbonyl phthalocyanines

et al. 2007

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“…119 Perylene tetraesters 66 with linear substituents form columnar mesophases with reasonably low melting points 120 and have been used for the fabrication of OLEDs 121 and photovoltaic solar cells. 122 The tetraesters with 2-ethylhexyl substituents 66, 67 and 68 (Fig. 12, 13) form columnar mesophases at room temperature and have clearing points at 260 uC, 153 uC, and .375 uC respectively.…”

Section: Low-symmetry Discotic Moleculesmentioning

confidence: 99%

Discotic liquid crystals: a new generation of organic semiconductors

2007

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Discotic (disc-like) molecules typically comprising a rigid aromatic core and flexible peripheral chains have been attracting growing interest because of their fundamental importance as model systems for the study of charge and energy transport and due to the possibilities of their application in organic electronic devices. 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. The chemical structure of the conjugated core of discotic molecules governs, to a large extent, their intramolecular electronic properties. Variation of the peripheral flexible chains and of the aromatic core is decisive for the tuning of self-assembly in solution and in bulk. Supramolecular organization of discotic molecules can be effectively controlled by the choice of the processing methods. In particular, approaches to obtain suitable macroscopic orientations of columnar superstructures on surfaces, that is, planar uniaxial or homeotropic alignment, are discussed together with appropriate processing techniques. Finally, an overview of charge transport in discotic materials and their application in optoelectronic devices is given.

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“…[5][6][7] These electronic properties together with their solubility and film forming properties qualify them for low cost solution processing of organic electronic devices. [8][9][10][11][12][13][14][15][16] Formation and alignment of monodomains over 100 mm length scales have been demonstrated for several DLCs albeit the alignment of the columnar stacks perpendicular to a substrate (homeotropic) is more difficult to achieve than parallel to a substrate (homogeneous). 1,2,17 Equally important to self-organization and alignment are the electronic properties of the DLC molecules, such as their red/ox potentials and frontier orbital energies, as they define charge transport across interfaces to electrodes and other materials in electronic devices.…”

Section: Introductionmentioning

confidence: 99%