Charge‐Transport Anisotropy in a Uniaxially Aligned Diketopyrrolopyrrole‐Based Copolymer

Schott, Sam; Gann, Eliot; Thomsen, Lars; Jung, Soo Yeon; Lee, Jin‐Kyun; McNeill, Christopher R.; Sirringhaus, Henning

doi:10.1002/adma.201502437

Cited by 153 publications

(209 citation statements)

References 61 publications

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“…Simulation results show that mechanical stretching can also rigidify polymer chains, increasing the effective persistence length and leading to higher‐yet overall conductivities . Post‐synthesis chain alignment strategies should thus be used in conjunction with rigid conjugated polymers to further reduce intrachain defects and align polymer chains and crystallites to enable the most efficient intrachain charge transport …”

Section: Opportunities For Improving Charge Transportmentioning

confidence: 99%

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

Loo

2019

J Polym Sci B Polym Phys

102

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Conjugated polymers are promising candidates for next‐generation low‐cost flexible electronics. Field‐effect transistors comprising conjugated polymers have witnessed significant improvements in device performance, notably the field‐effect mobility, in the last three decades. However, to truly make these materials commercially competitive, a better understanding of charge‐transport mechanisms in these structurally heterogeneous systems is needed for providing systematic guides for further improvements. This review assesses the key microstructural features of conjugated polymers across multiple length scales that can influence charge transport, with special attention given to the underlying polymer physics. The mechanistic understanding from collective experimental and theoretical studies point to the importance of interconnected ordered domains given the macromolecular nature of the polymeric semiconductors. Based on the criterion, optimization to improve charge transport can be broadly characterized by efforts to (a) promote intrachain transport, (b) establish intercrystallite connectivity, and (c) enhance interchain coupling. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1559–1571

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Section: Opportunities For Improving Charge Transportmentioning

confidence: 99%

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

Loo

2019

J Polym Sci B Polym Phys

102

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“…12 Band-like transport in organic materials is now well established in the case of small molecules, both for single crystals 14,15,16,17 and more recently for thin films. 18,19 Likely because of the intrinsically higher degree of disorder in polymer semiconductors, very few cases of inverted temperature activated transport have been demonstrated for p-type polymer devices, 20,21,22,23 and only a single one for ntype ones. 24 The observation of such inverted temperature activation has been so far assigned either to a specific chemical structure, 24 to processing conditions, 20 or to the degree of backbone alignment.…”

Section: Introductionmentioning

confidence: 99%

“…24 The observation of such inverted temperature activation has been so far assigned either to a specific chemical structure, 24 to processing conditions, 20 or to the degree of backbone alignment. 21,22,23 It is indeed of utmost importance to clarify the conditions necessary to observe the transition from thermal activation towards temperature independent and band-like transport in polymer FETs.…”

Section: Introductionmentioning

confidence: 99%

Microstructural control suppresses thermal activation of electron transport at room temperature in polymer transistors

et al. 2019

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Recent demonstrations of inverted thermal activation of charge mobility in polymer field-effect transistors have excited the interest in transport regimes not limited by thermal barriers. However, rationalization of the limiting factors to access such regimes is still lacking. An improved understanding in this area is critical for development of new materials, establishing processing guidelines, and broadening of the range of applications. Here we show that precise processing of a diketopyrrolopyrrole-tetrafluorobenzene-based electron transporting copolymer results in single crystal-like and voltage-independent mobility with vanishing activation energy above 280 K. Key factors are uniaxial chain alignment and thermal annealing at temperatures within the melting endotherm of films. Experimental and computational evidences converge toward a picture of electrons being delocalized within crystalline domains of increased size. Residual energy barriers introduced by disordered regions are bypassed in the direction of molecular alignment by a more efficient interconnection of the ordered domains following the annealing process.

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“…The solvent and its vapor pressure play a very important role as slow evaporation provides enough time for crystallization and enhanced order. [33,99] Alignment of the polymer chains along a preferential lateral direction and thus highly anisotropic and enhanced charge transport can be achieved via the application of shear during deposition, [100] by zone-casting, [61] via annealing to the nematic phase on a rubbed polyimide substrate [59,101] or by guided crystallization with trichlorobenzene. The resulting length scales of the separated domains are determined by the molecular weight of the polymers and the used solvents (and additives).…”

Section: Thin Film Formation and Morphologymentioning

confidence: 99%

Semiconducting Single‐Walled Carbon Nanotubes or Very Rigid Conjugated Polymers: A Comparison

Zaumseil

2018

Adv Elect Materials

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With the ability to produce large amounts of purely semiconducting and even monochiral dispersions of single-walled carbon nanotubes (SWCNT) their application as a bulk material in thin film devices on a large scale becomes feasible. Their physical properties, processing, and final devices are quite similar to those of semiconducting polymers. In the extreme case one may view carbon nanotubes as very long, rigid, and fully conjugated polymers. This analogy raises the question whether the knowledge accumulated over the last two decades of processing and studying conjugated polymers could be transferred to solution-processed nanotube devices. Here, the optical and electronic properties of both materials in solution and in thin films are discussed and compared with a focus on their application in optoelectronic devices. Some striking similarities and common issues are highlighted to show the connection between conjugated polymers and SWCNTs as 1D semiconductors.

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Charge‐Transport Anisotropy in a Uniaxially Aligned Diketopyrrolopyrrole‐Based Copolymer

Cited by 153 publications

References 61 publications

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

Microstructural control suppresses thermal activation of electron transport at room temperature in polymer transistors

Semiconducting Single‐Walled Carbon Nanotubes or Very Rigid Conjugated Polymers: A Comparison

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