Control of crystal morphology in dewetted films of thienyl dyes

Karthaus, Olaf; Imai, Toshiro; Sato, Junji; Kurimura, S.; Nakamura, Ryusuke

doi:10.1007/s00339-003-2346-7

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…The obtained carrier mobility was comparable to those reported for polycrystalline films, suggesting that the generated crystal cannot cover the channel with a monodomain. However, this mechanism highlights the potential of our method because the controlled crystal growth speed and direction can create a uniform crystal. − In the case of over 10 kHz (or dc mode), deposits might be generated near the electrodes (or cathode). The resulting crystalline shape depends on the film formation process, leading to a wide variety of shapes.…”

Section: Resultsmentioning

confidence: 99%

Droplet Manipulation by an External Electric Field for Crystalline Film Growth

et al. 2013

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Combining droplet manipulation by the application of an electric field with inkjet printing is proposed as a unique technique to control the surface wettability of substrates for solution-processed organic field-effect transistors (FETs). With the use of this technique, uniform thin films of 2,7-dioctyl[1]benzothieno[2,3,-b][1]benzothiopene (C8-BTBT) could be fabricated on the channels of FET substrates without self-assembled monolayer treatment. High-speed camera observation revealed that the crystals formed at the solid/liquid interface. The coverage of the crystals on the channels depended on the ac frequency of the external electric field applied during film formation, leading to a wide variation in the carrier transport of the films. The highest hole mobility of 0.03 cm(2) V(-1) s(-1) was obtained when the coverage was maximized with an ac frequency of 1 kHz.

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Section: Resultsmentioning

confidence: 99%

Droplet Manipulation by an External Electric Field for Crystalline Film Growth

et al. 2013

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“…Another amorphous sample was annealed at 50 and single crystals were formed. 41) Since the speed of crystal growth depends on the degree of undercooling , the crystallization of the domes in the room temperature sample occurs immediately after the formation of a crystallization seed in each dome. Rapid crystallization facilitates the formation of defects and thus the formation of polycrystals.…”

Section: Crystalline Dyes For Non-linear Opticsmentioning

confidence: 99%

Ordered Dewetting and Self-Organization of Microdroplets on Surfaces

Karthaus

2004

Journal of The Surface Science Society of Japan

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“…The roller is moved over the substrate at a constant speed and the volatile solvent is allowed to evaporate during the rolling. 20) The evaporation takes place at the solution surface, that is, the liquid area not covered by the glass roller. By controlling the roller speed, solute concentration and the presence or absence of polymer in the solution, 21,22) we were able to produce a variety of crystal morphologies.…”

Section: Introductionmentioning

confidence: 99%

Control of Crystal Morphology of Aromatic Electron Donors and Acceptors for Organic Electronics

Karthaus

Nagata

Nishide

et al. 2008

jjap

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Low-molar-mass organic compounds can form oriented crystal fibers on various substrates by a simple casting technique. A dilute solution of an aromatic organic compound, such as a tetrathiofulvalene derivative, an annulated aromatic such as tetracene, or a perylene diimid, is cast on a substrate, and the solvent is allowed to evaporate while rolling a glass bar over the substrate. Because the crystal formation takes place at the solution edge, crystals grow in the roller direction. Optical microscopy, fluorescence microspectrometry, and scanning nearfield optical microscopy were used to characterize the resulting fibers and crystals. Casting on interdigitated electrodes enabled us to measure conductivity and field effect transistors in these oriented crystals.

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Control of crystal morphology in dewetted films of thienyl dyes

Cited by 11 publications

References 8 publications

Droplet Manipulation by an External Electric Field for Crystalline Film Growth

Droplet Manipulation by an External Electric Field for Crystalline Film Growth

Ordered Dewetting and Self-Organization of Microdroplets on Surfaces

Control of Crystal Morphology of Aromatic Electron Donors and Acceptors for Organic Electronics

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