Solvent Influence on Thickness, Composition, and Morphology Variation with Dip-Coating Rate in Supramolecular PS-<i>b</i>-P4VP Thin Films

Roland, Sébastien; Gamys, Cé Guinto; Grosrenaud, Josué; Boissé, Stéphanie; Pellerin, Christian; Prud’homme, Robert E.; Bazuin, C. Géraldine

doi:10.1021/acs.macromol.5b00847

Cited by 42 publications

(110 citation statements)

References 53 publications

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“…TEM was also adopted to investigate the crystal structure of the C8‐BTBT fabricated from the 5 g L −1 solution. The TEM images ( Figure a,c) and the selected area electron diffraction patterns (Figure b,d) clearly showed a periodic arrangement and highly oriented arrangement, and the perpendicular distance between the molecular was measured to be 2.8 Å, which was consistently with the report …”

Section: Resultssupporting

confidence: 86%

“…Then, we selected three different concentrations, 3, 5, and 8 g L −1 , and took the lifting speed into consideration. According to Roland et al, the film thickness is difficult to control at a low lifting speed, so we lifted the substrate in a relative high speed. First, we measured the natural flow down speeds of the C8‐BTBT solutions on the substrate to be all about 0.5 mm s −1 .…”

Section: Resultsmentioning

confidence: 99%

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Marangoni Effect‐Controlled Growth of Oriented Film for High Performance C8‐BTBT Transistors

Wang

Guo

et al. 2019

Adv Materials Inter

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of researchers because of its higher carrier mobility in solution fabricated OFET devices. [5,6] Anthopoulos introduced a method for blending C8-BTBT with a polymer, achieving a mobility of 13 cm 2 V −1 s −1 , while Minemawari et al. reported that the C8-BTBT carrier mobility could reach 16.4 cm 2 V −1 s −1 by applying the inkjet printing process. [7,8] Bao and co-workers reported C8-BTBT transistors with an ultrahigh carrier mobility of 43 cm 2 V −1 s −1 , which were produced by off-center spin coating. [6] Wang et al. used the airflow method to fabricate C8-BTBT single crystalline layers and transistors with average and maximum mobilities of 4.8 and 13.0 cm 2 V −1 s −1 , respectively. [9] Nonetheless, the fabrication methods proposed until now still present the drawbacks of being complex and of producing films characterized by an insufficient mobility and low uniformity when to be applied to large-area substrates. Therefore, new methods for OFETs production still need to be developed.In a previous work, our group achieved the production of highly oriented 6,13-bis(triisopropylsilylethynyl) pentacene crystalline thin films by the Marangoni effect-controlled oriented growth (MOG). [10] The MOG method combines the advantages of the "Coffee ring" and Marangoni effects, including highly oriented film deposition, capability of fabricating high surface area films, and low fabrication times. In this work, the MOG method is extended to the fabrication of a C8-BTBT thin film. The substrate is dipped into a mixture solution of C8-BTBT in methylbenzene and carbon tetrachloride and then lifted from the liquid. With the evaporation of the solvent, the "coffee ring" effect makes C8-BTBT particles deposit on the upper edge of the substrate, while the Marangoni effect causes a movement of the C8-BTBT particle away from the upper edge (Figure 1). The balance of these two effects favors the production of a uniform C8-BTBT film on the substrate during the evaporation of the solution. The produced C8-BTBT film is oriented and uniformly covers the substrate.In our experiments, a glass/indium tin oxide (ITO)/AlO x substrate is used. The choice was made because that AlO x can act as the dielectric gate and is capable of adsorbing the alkyl solution, which is favoring the optimal arrangement of the C8-BTBT molecules based on the MOG method. [11][12][13] Grazing-incidence X-ray diffraction (GIXRD) and transmission electron microscopy (TEM) were applied to find that the produced C8-BTBT film was highly oriented. The OFETs based on this C8-BTBT Highly oriented organic semiconductors have the advantages of relative low trap density and high carrier mobility. These features make organic transistors valuable in many commercial fields, such as electronic sensor arrays and flexible circuits. Here a simple and efficient "Marangoni effect-controlled growth" method is introduced to fabricate highly oriented 2,7-dioctyl[1] benzothieno[3,2-b][1]benzothiophene (C8-BTBT) films on AlO x substrates. The oriented film can cover nearly 60% of the substra...

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Marangoni Effect‐Controlled Growth of Oriented Film for High Performance C8‐BTBT Transistors

Wang

Guo

et al. 2019

Adv Materials Inter

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“…40,41 However, with chloroform and THF having similar vapor pressures (chloroform, 26.2 kPa; THF, 21.6 kPa), this factor can be excluded here. 42 Overall, these results suggest that, for a given solvent, the dominant solvation of a chiral side chain results in the aggregation of the other chiral side chain with the main chain. However, further study is required to clearly verify the relation between solubility difference and the formation of chiral aggregates.…”

Section: Resultsmentioning

confidence: 86%

“…Another factor involved in the chiral inversion may be the difference between the rate of evaporation of each solvent, since it has been previously reported to affect the morphology in the solid state . However, with chloroform and THF having similar vapor pressures (chloroform, 26.2 kPa; THF, 21.6 kPa), this factor can be excluded here . Overall, these results suggest that, for a given solvent, the dominant solvation of a chiral side chain results in the aggregation of the other chiral side chain with the main chain.…”

Section: Resultsmentioning

confidence: 99%

Solvent polarity effects on supramolecular chirality of a polyfluorene‐thiophene copolymer

et al. 2018

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This study demonstrates the supramolecular chirality control of a conjugated polymer via solvent polarity. We designed and synthesized a chiral polyfluorene-thiophene copolymer having two different chiral side chains at the 9-position of the fluorene unit. Chiral cyclic and alkyl ethers with different polarities were selected as the chiral side chains. The sign of the circular dichroism spectra in the visible wavelength region was affected by the solvent system, resulting from the change of supramolecular structure. The estimation of the solubility parameter revealed that the solubility difference of the side chains contributed to the change of the circular dichroism sign, which was also observed in spin-coated films prepared from good solvents having different polarities.

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“…A significant increase in R h > 100 nm is associated to the micellar aggregation in DOX and THF. However, slight swelling of P4VP chains in THF compared to DOX leads to the smaller hydrodynamic radius with the moderately softer micellar P4VP cores . PS 76 P4VP 24 455 solutions in DOX and THF were visibly turbid which was more pronounced in DOX because of the very large size micelles or aggregates.…”

Section: Resultsmentioning

confidence: 98%

Structure Formation of Binary Blends of Amphiphilic Block Copolymers in Solution and in Bulk

Radjabian

Abetz

Fischer

et al. 2017

Macro Chemistry & Physics

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The self‐assembly and structure formation in binary blends of asymmetric polystyrene‐block‐poly(4‐vinylpyridine) diblock copolymers in different solvent systems and the bulk morphology of the blend films are studied by using dynamic light scattering, small‐angle X‐ray scattering, and transmission electron microscopy. In dilute solutions, the chains of pure diblock copolymers or binary blends of diblock copolymers having similar or different molecular weights remain as unimers, form common micelles in selective solvents or form unimers in coexistence with micelles in slightly selective solvents or solvent mixtures. The blends show mixing of the chemically similar blocks in the blend films and solutions at high concentrations. A single‐phase with common spherical morphology is formed in the blend films similar with the morphology of the individual components in the pure state. The characteristic length scale of the blends depends on the number average molecular weight following the typical scaling behavior of a strongly segregated block copolymer.

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Solvent Influence on Thickness, Composition, and Morphology Variation with Dip-Coating Rate in Supramolecular PS-b-P4VP Thin Films

Cited by 42 publications

References 53 publications

Marangoni Effect‐Controlled Growth of Oriented Film for High Performance C8‐BTBT Transistors

Marangoni Effect‐Controlled Growth of Oriented Film for High Performance C8‐BTBT Transistors

Solvent polarity effects on supramolecular chirality of a polyfluorene‐thiophene copolymer

Structure Formation of Binary Blends of Amphiphilic Block Copolymers in Solution and in Bulk

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