Manipulation and statistical analysis of the fluid flow of polymer semiconductor solutions during meniscus-guided coating

Shaw, Leo; Diao, Ying; Martin-Noble, Geoffrey C.; Yan, Hongping; Hayoz, Pascal; Weitz, R. Thomas; Kaelblein, Daniel; Toney, Michael F.; Bao, Zhenan

doi:10.1557/s43577-021-00049-9

Cited by 5 publications

(5 citation statements)

References 42 publications

(20 reference statements)

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“…Changes in flow fluidity can also increase the supplementation rate of solute. [171,172] Diao et al [105] added micropillars on the shearing blade to solve the problem of mass transport limitation during solution shearing (Figure 14a). The cross-section of the micropillars is meniscus-shaped and the protruding side is opposite to the direction of liquid flow.…”

Section: Supplementation Of Solutesmentioning

confidence: 99%

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Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Ren

Cao

2023

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as well as their application in organic optoelectronic devices, such as organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs), and other devices. [3][4][5][6][7][8][9][10][11] OFET is one of the basic devices to characterize electrical properties of OSCs and also has wide applications as the core component of organic electronic products, such as organic sensors, organic electronic circuits, wearable electronic devices, and so on. [12] Over these years, the performance of OSCs and their OFETs has been continuously improved, with the high carrier mobilities of transistors (µ) > 1-10 cm 2 V −1 s −1 . [13] In addition to optimizing the molecular structures and characteristics of OSCs (typically main-chain engineering and side-chain engineering), [14][15][16] another key factor in developing high-performance semiconductors and transistors is the processing technology. [17] It is well known that the electrical properties of OSCs not only depend on the molecular structures, but also are closely on the aggregation structures of the semiconductor thin films, resulting in two carrier transport modes: intramolecular band transport and intermolecular hopping transport. The carrier mobilities of the same OSC with different aggregated structures may differ by 10 or even 100 times, because the microstructure and the morphology of OSC films are influenced by many factors, such as intermolecular interaction, external forces, annealing, molecular self-assembly, and so on. [18][19][20] The common processing technologies of OSC thin films are mainly vacuum vapor deposition and solution processing. Vacuum deposition is only suitable for some small molecule semiconductors, and requires large equipments and high temperatures. So far, a great variety of solution processing methods [21] have been adopted to deposit semiconductor thin films, and spin coating is the most commonly used method in the laboratory. The process of spin coating is simple and suitable for small-area, but hard to prepare large-area uniform films, and more than 95% of the materials are wasted. [22] In addition, the orientation degree of the thin films prepared by spin coating is not high, and it is easier to form small-size spherulite crystals. Finally, the shear stress distribution is uneven during the spin-coating process, which makes it difficult to control the film morphology. [7] Solution-processable organic semiconductors are one of the promising materials for the next generation of organic electronic products, which call for high-performance materials and mature processing technologies. Among many solution processing methods, meniscus-guided coating (MGC) techniques have the advantages of large-area, low-cost, adjustable film aggregation, and good compatibility with the roll-to-roll process, showing good research results in the preparation of high-performance organic fieldeffect transistors. In this review, the types of MGC techniques are first listed and the relevant mechanisms (wetting mechanism, fluid...

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Section: Supplementation Of Solutesmentioning

confidence: 99%

“…Changes in flow fluidity can also increase the supplementation rate of solute. [ 171,172 ] Diao et al. [ 105 ] added micropillars on the shearing blade to solve the problem of mass transport limitation during solution shearing ( Figure a).…”

Section: Morphology Controlling Strategy and Device Performancementioning

confidence: 99%

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Ren

Cao

2023

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“…Dip coating of Newtonian viscous fluids on different substrates has been studied in various applications and significant progress in the understanding of the fluid mechanics of film formation has been achieved [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Among different substrates, fibers and rods are the most challenging to coat: the curvature of the cylinder significantly influences the film deposition kinetics by altering the flow pattern in the meniscus region [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

The Thickness and Structure of Dip-Coated Polymer Films in the Liquid and Solid States

2022

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Films formed by dip coating brass wires with dilute and semi-dilute solutions of polyvinyl butyral in benzyl alcohol were studied in their liquid and solid states. While dilute and semi-dilute solutions behaved as Maxwell viscoelastic fluids, the thickness of the liquid films followed the Landau-Levich-Derjaguin prediction for Newtonian fluids. At a very slow rate of coating, the film thickness was difficult to evaluate. Therefore, the dynamic contact angle was studied in detail. We discovered that polymer additives preserve the advancing contact angle at its static value while the receding contact angle follows the Cox–Voinov theory. In contrast, the thickness of solid films does not correlate with the Landau-Levich-Derjaguin predictions. Only solutions of high-molecular-weight polymers form smooth solid films. Solutions of low-molecular-weight polymers may form either solid films with an inhomogeneous roughness or solid polymer domains separated by the dry substrate. In technological applications, very dilute polymer solutions of high-molecular-weight polymers can be used to avoid inhomogeneities in solid films. These solutions form smooth solid films, and the film thickness can be controlled by the experimental coating conditions.

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“…The introduction and optimization of supramolecular interactions ( e.g. , hydrogen bonds, 10,11 metal–ligand coordination, 12,13 and ionic bonds 14,15 ) in a permanently cross-linked polymer network is the main strategy for the preparation of self-healing polymers. However, the incorporation of a high filler content to improve the performance of thermally conductive composites can lead to inhomogeneous agglomeration of the filler in the matrix and makes it challenging to reconstruct the damaged thermally conductive network by non-covalent interactions alone.…”

Section: Introductionmentioning

confidence: 99%

Superior stretchable, low thermal resistance and efficient self-healing composite elastomers for thermal management

Wang

Fan

et al. 2022

J. Mater. Chem. A

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Manipulation and statistical analysis of the fluid flow of polymer semiconductor solutions during meniscus-guided coating

Cited by 5 publications

References 42 publications

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

The Thickness and Structure of Dip-Coated Polymer Films in the Liquid and Solid States

Superior stretchable, low thermal resistance and efficient self-healing composite elastomers for thermal management

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