Growth of Ultrathin Organic Semiconductor Microstripes with Thickness Control in the Monolayer Precision

Li, Liqiang; Gao, Peng; Wang, Wenchong; Müllen, Kläus; Fuchs, Harald; Chi, Lifeng

doi:10.1002/anie.201306953

Cited by 92 publications

(96 citation statements)

References 74 publications

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“…As shown in Equation , c is directly proportional to mass transfer rate if d ∀/ d t is a constant. On the other hand, v and t osc are inversely proportional and therefore the shearing speed has been utilized as the thickness regulation factor, which have been observed by other research group . In order to determine the exact correlation between v and t osc in a certain range of d m/ d t , the same value of d ∀/ d t is required and it is actually a function of T and T b as we will discuss later.…”

Section: Resultsmentioning

confidence: 95%

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Chen

Peng

Huang

et al. 2019

Adv Funct Materials

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Meniscus-guided coating (MGC) is mainly applicable on the soluble organic semiconductors with strong π-π overlap for achieving single-crystalline organic thin films and high-performance organic field-effect-transistors (OFETs). In this work, four elementary factors including shearing speed (v), solute concentration (c), deposition temperature (T), and solvent boiling point (T b ) are unified to analyze crystal growth behavior in the meniscus-guided coating. By carefully varying and studying these four key factors, it is confirmed that v is the thickness regulation factor, while c is proportional to crystal growth rate. The MGC crystal growth rate is also correlated to latent heat (L) of solvents and deposition temperature in an Arrhenius form. The latent heat of solvents is proportional to T b . The OFET channels grown by the optimized MGC parameters show uniform crystal morphology (Roughness R q < 0.25 nm) with decent carrier mobilities (average µ = 5.88 cm 2 V −1 s −1 and highest µ = 7.68 cm 2 V −1 s −1 ). The studies provide a generalized formula to estimate the effects of these fabrication parameters, which can serve as crystal growth guidelines for the MGC approach. It is also an important cornerstone towards scaling up the OFETs for the sophisticated organic circuits or mass production.

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Section: Resultsmentioning

confidence: 95%

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Chen

Peng

Huang

et al. 2019

Adv Funct Materials

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“…Single crystals of organic semiconductor thin fi lms composed of small molecules have been obtained by several sophisticated techniques, such as dip coating, [ 14,15 ] inkjet printing, [ 16 ] and solution shearing. [ 17 ] Note that solution shearing differs from similar methods [ 18 ] such as blade coating, which is used to fabricate amorphous fi lms composed of ferroelectric [ 19 ] or organic light-emitting diode materials.…”

Section: Doi: 101002/adma201502357mentioning

confidence: 99%

Few‐Volt Operation of Printed Organic Ferroelectric Capacitor

et al. 2015

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The fabrication of single-crystalline thin-film arrays for an organic ferroelectric small molecule is achieved by a simple solution process without additional thermal annealing. Based on a cooperative proton tautomerism through a hydrogen-bonding network, films show the polarity switching with an operating voltage of less than 5 V at room temperature. This approach provides a low-cost and eco-friendly fabrication of ferroelectric devices.

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“…Second, the obtained results are related to the case of prestructured substrates where κ(x, y) is spatially varying about the reference value, i.e., about κ = 1. In the latter case we assume prestructures that correspond either to stripes parallel to the transfer velocity κ(y) = 1 + ρ tanh s 4 frac y L pre − 0.5 − 1 (6) or perpendicular to the transfer velocity…”

Section: Mathematical Modelling and Numerical Approachmentioning

confidence: 99%

“…Many experimental set-ups as well as industrial applications involve the transfer of simple and complex liquids onto solid substrates by withdrawing the substrates from a liquid bath at a certain velocity [1,2,3,4]. Examples are dip-coating processes with simple liquids, solutions or suspensions (e.g., [5,6,7,8,9]) or the Langmuir-Blodgett transfer process that is used to transfer monomolecular layers of amphiphilic molecules from the surface of a liquid bath onto a solid (e.g., [10]). In such set-ups, the liquid-gas interface forms a meniscus close to the three-phase contact line.…”

Section: Introductionmentioning

confidence: 99%

Dip-coating with prestructured substrates: transfer of simple liquids and Langmuir–Blodgett monolayers

Wilczek

Zhu

Chi

et al. 2016

J. Phys.: Condens. Matter

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When a plate is withdrawn from a liquid bath, either a static meniscus forms in the transition region between the bath and the substrate or a liquid film of finite thickness (a Landau-Levich film) is transferred onto the moving substrate. If the substrate is inhomogeneous, e.g. has a prestructure consisting of stripes of different wettabilities, the meniscus can be deformed or show a complex dynamic behavior. Here we study the free surface shape and dynamics of a dragged meniscus occurring for striped prestructures with two orientations, parallel and perpendicular to the transfer direction. A thin film model is employed that accounts for capillarity through a Laplace pressure and for the spatially varying wettability through a Derjaguin (or disjoining) pressure. Numerical continuation is used to obtain steady free surface profiles and corresponding bifurcation diagrams in the case of substrates with different homogeneous wettabilities. Direct numerical simulations are employed in the case of the various striped prestructures. The final part illustrates the importance of our findings for particular applications that involve complex liquids by modeling a Langmuir-Blodgett transfer experiment. There, one transfers a monolayer of an insoluble surfactant that covers the surface of the bath onto the moving substrate. The resulting pattern formation phenomena can be crucially influenced by the hydrodynamics of the liquid meniscus that itself depends on the prestructure on the substrate. In particular, we show how prestructure stripes parallel to the transfer direction lead to the formation of bent stripes in the surfactant coverage after transfer and present similar experimental results.

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Growth of Ultrathin Organic Semiconductor Microstripes with Thickness Control in the Monolayer Precision

Cited by 92 publications

References 74 publications

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Few‐Volt Operation of Printed Organic Ferroelectric Capacitor

Dip-coating with prestructured substrates: transfer of simple liquids and Langmuir–Blodgett monolayers

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