Self‐Organization of Ink‐jet‐Printed Triisopropylsilylethynyl Pentacene via Evaporation‐Induced Flows in a Drying Droplet

Lim, Jung Ah; Lee, Wi Hyoung; Lee, Hwa Sung; Lee, Ji Hwang; Park, Yeong Don; Cho, Kilwon

doi:10.1002/adfm.200700859

Cited by 404 publications

(206 citation statements)

References 29 publications

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“…S7). In comparison, other patterning methods used to create patterned OSCs for isolated OTFTs have shown relative variances ranging from 20% to 84% (9,15,17,22,31,32,35,42,(48)(49)(50)(51)(52)(53)(54). For example, Li et al (15) have shown that using a PMMA:C8BTBT blend on a solution wetting pattern can deposit crystal plates that have a mobility relative variance of >40%.…”

Section: Resultsmentioning

confidence: 99%

Large-area formation of self-aligned crystalline domains of organic semiconductors on transistor channels using CONNECT

Park

Giri

Shaw

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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The electronic properties of solution-processable small-molecule organic semiconductors (OSCs) have rapidly improved in recent years, rendering them highly promising for various low-cost largearea electronic applications. However, practical applications of organic electronics require patterned and precisely registered OSC films within the transistor channel region with uniform electrical properties over a large area, a task that remains a significant challenge. Here, we present a technique termed "controlled OSC nucleation and extension for circuits" (CONNECT), which uses differential surface energy and solution shearing to simultaneously generate patterned and precisely registered OSC thin films within the channel region and with aligned crystalline domains, resulting in low device-to-device variability. We have fabricated transistor density as high as 840 dpi, with a yield of 99%. We have successfully built various logic gates and a 2-bit halfadder circuit, demonstrating the practical applicability of our technique for large-scale circuit fabrication.organic semiconductors | patterning | small molecules | transistors | circuits

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Section: Resultsmentioning

confidence: 99%

Large-area formation of self-aligned crystalline domains of organic semiconductors on transistor channels using CONNECT

Park

Giri

Shaw

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…Thermal Marangoni flows may arise on heated/cooled substrates, 27,28 or through evaporative cooling. 32,35 Alternatively, solutal Marangoni flows can occur in solvent mixtures, 15,23,36,37 or in the presence of surfactants. 24,38,39 However, when the droplet becomes thin, the evaporation-driven capillary flow may overcome the Marangoni flow, producing a ring stain.…”

Section: -31mentioning

confidence: 99%

Control of the Particle Distribution in Inkjet Printing through an Evaporation-Driven Sol–Gel Transition

Talbot

Yang

Berson

2014

ACS Appl. Mater. Interfaces

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2014) 'Control of the particle distribution in inkjet printing through an evaporation-driven sol-gel transition.', ACS applied materials interfaces., 6 (12). pp. 9572-9583.Further information on publisher's website:http://dx.doi.org/10.1021/am501966nPublisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in ACS Applied Materials Interfaces, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/am501966n. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract A ring stain is often an undesirable consequence of a droplet drying. Particles inside evaporating droplets with a pinned contact line are transported towards the periphery by radial flow. In this paper, we demonstrate how suspensions of laponite can be used to control the radial flow inside picolitre droplets and produce uniform deposits.The improvement in homogeneity arises from a sol-gel transition during evaporation.Droplets gel from the contact line inwards, reducing radial motion of particles and thus inhibiting the formation of a ring stain. The internal flows and propagation of the gelling front were followed by high-speed imaging of tracer particles during the evaporation of picolitre droplets of water. In the inkjet nozzle, the laponite network * To whom correspondence should be addressed † Department of Chemistry, Durham University, Durham, DH1 3LE, United Kingdom ‡ School of Engineering and Computing Sciences, Durham University, Durham, DH1 3LE, United Kingdom 1 is broken down under high shear. Recovery of the low shear viscosity of laponite suspensions was shown to be fast with respect to the lifetime of the droplet, which was instrumental in controlling the deposit morphology. The radial and vertical particle distributions within dried deposits were measured for water droplets loaded with 1%w and 5%w polystyrene spheres and various concentrations of laponite. Aggregation of the polystyrene spheres was suppressed by addition of colloidal silica. The formulation can be tuned to vary the deposit profile from a ring to a pancake or a dome.

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“…Next, the organic molecules in the channel region must be appropriately organized to ensure the optimal charge carrier transport. Here, proper molecular design, improved self-alignment through surface modification, and thermal annealing all help to enhance the orbital overlap leading to improved charge carrier hopping [112][113][114][115][116]. Subsequently, the dielectric film used must provide the maximum capacitance, which is possible either using high dielectric constant material or reducing the dielectric film thickness.…”

Section: Materials Selection Criteria For Os Devicesmentioning

confidence: 99%

Organic semiconductors for device applications: current trends and future prospects

Ahmad

2014

Journal of Polymer Engineering

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Abstract:With the rich experience of developing silicon devices over a period of the last six decades, it is easy to assess the suitability of a new material for device applications by examining charge carrier injection, transport, and extraction across a practically realizable architecture; surface passivation; and packaging and reliability issues besides the feasibility of preparing mechanically robust wafer/substrate of single-crystal or polycrystalline/ amorphous thin films. For material preparation, parameters such as purification of constituent materials, crystal growth, and thin-film deposition with minimum defects/ disorders are equally important. Further, it is relevant to know whether conventional semiconductor processes, already known, would be useable directly or would require completely new technologies. Having found a likely candidate after such a screening, it would be necessary to identify a specific area of application against an existing list of materials available with special reference to cost reduction considerations in large-scale production. Various families of organic semiconductors are reviewed here, especially with the objective of using them in niche areas of large-area electronic displays, flexible organic electronics, and organic photovoltaic solar cells. While doing so, it appears feasible to improve mobility and stability by adjusting π-conjugation and modifying the energy bandgap. Higher conductivity nanocomposites, formed by blending with chemically conjugated C-allotropes and metal nanoparticles, open exciting methods of designing flexible contact/interconnects for organic and flexible electronics as can be seen from the discussion included here.

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Self‐Organization of Ink‐jet‐Printed Triisopropylsilylethynyl Pentacene via Evaporation‐Induced Flows in a Drying Droplet

Cited by 404 publications

References 29 publications

Large-area formation of self-aligned crystalline domains of organic semiconductors on transistor channels using CONNECT

Large-area formation of self-aligned crystalline domains of organic semiconductors on transistor channels using CONNECT

Control of the Particle Distribution in Inkjet Printing through an Evaporation-Driven Sol–Gel Transition

Organic semiconductors for device applications: current trends and future prospects

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