2022
DOI: 10.1021/acsnano.2c04049
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Transforming Polymorphs via Meniscus-Assisted Solution-Shearing Conjugated Polymers for Organic Field-Effect Transistors

Abstract: The ability to tune polymorphs of conjugated polymers affords a robust platform for investigating the processing–structure–property relationship. However, simple and generalizable routes to polymorphs have yet to be realized. Herein, we report a viable meniscus-assisted solution-shearing (MASS) strategy to effectively modulate polymorphs (i.e., polymorphs I and II) of poly­(3-butylthiophene) (P3BT) and scrutinize the correlation between the two different polymorphs and charge transport characteristics. Specifi… Show more

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Cited by 26 publications
(32 citation statements)
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“…Their polymorphism can be called type II due to a smaller interlayer spacing along the alkyl side chain similar to P3ATs and P3ASs. 12,18,23 Moreover, previous investigations did not exhibit two different d 100 simultaneously in the same PBTTT sample with long alkyl side chains (i.e., PBTTT-12 and PBTTT-14). 24,25 Clearly, it is tantalizing to unfold why no polymorphism transformation is seen in PBTTT and under what conditions PBTTT may display different polymorphisms.…”
Section: ■ Introductionmentioning
confidence: 80%
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“…Their polymorphism can be called type II due to a smaller interlayer spacing along the alkyl side chain similar to P3ATs and P3ASs. 12,18,23 Moreover, previous investigations did not exhibit two different d 100 simultaneously in the same PBTTT sample with long alkyl side chains (i.e., PBTTT-12 and PBTTT-14). 24,25 Clearly, it is tantalizing to unfold why no polymorphism transformation is seen in PBTTT and under what conditions PBTTT may display different polymorphisms.…”
Section: ■ Introductionmentioning
confidence: 80%
“…Notably, some pioneering studies elucidated two phase transitions in PBTTT with long dodecyl and tetradecyl side chains (i.e., PBTTT-12 and PBTTT-14) during thermal annealing, corresponding to the melting of alkyl side chains (i.e., the first thermal transition) and the backbone melting (i.e., the second thermal transition) that yield terraced and nanoribbon-like morphologies, respectively. These two phases are assumed to possess the same polymorphism as their interlayer spacing ( d 100 ) only slightly changes. Their polymorphism can be called type II due to a smaller interlayer spacing along the alkyl side chain similar to P3ATs and P3ASs. ,, Moreover, previous investigations did not exhibit two different d 100 simultaneously in the same PBTTT sample with long alkyl side chains (i.e., PBTTT-12 and PBTTT-14). , Clearly, it is tantalizing to unfold why no polymorphism transformation is seen in PBTTT and under what conditions PBTTT may display different polymorphisms. Moreover, tailoring polymorphisms in more conjugated CPs (e.g., PBTTT as compared to P3ATs) renders the unraveling of the structure–charge transport property correlation for application in high-performance optoelectronics.…”
Section: Introductionmentioning
confidence: 95%
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“…A drop of P3BT- b -P3HS TCB solution (20 mg/mL) was loaded in two plates in a nearly parallel geometry comprising an upper glass slide and a lower SiO 2 substrate (the angle and distance between the two plates was ∼10° and 150 μm, respectively). The lower SiO 2 substrate was placed on a movable stage (Parker Hannifin Corp.) with the temperature controlled at 50 °C.…”
Section: Methodsmentioning
confidence: 99%
“…A semicrystalline polymer behaves like a random coil in static solutions but may be stretched in a velocity field. Generally, applying shear has been a common method to enhance polymer crystallization or long-range orientation of polymer chains. In view of an evaporating semicrystalline polymer sessile droplet, we anticipate that evaporation-induced flow might affect the crystallization behavior and the related optical properties. To the best of our knowledge, the relation between solvent evaporation and polymer crystallization in sessile droplets remains a long-standing question to be clarified, despite the drying droplets are commonly observed in laboratories and our daily life.…”
Section: Introductionmentioning
confidence: 99%