Controlling aggregation and crystallization of solution processed diketopyrrolopyrrole based polymer for high performance thin film transistors by pre-metered slot die coating process

Chang, Jingjing; Sonar, Prashant; Lin, Zhenhua; Zhang, Chunfu; Zhang, Jie; Hao, Yue; Wu, Jishan

doi:10.1016/j.orgel.2016.06.003

Cited by 20 publications

(23 citation statements)

References 41 publications

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“…[208] In a later report by the same group, they implemented a preaggregating strategy by adding controlled amounts of an anti-solvent (MeOH) to a stable solution of a furan-substituted DPP in CF. [209] Despite the evident presence of aggregates in solution with improved crystallinity (supported by UV-Vis absorption spectra and morphological characterization), the attempt provided a poor degree of alignment and an increase in mobility by a factor of 3, possibly because of the high molecular weight of the copolymer (Mn = 24 kg/mol, Mw = 55 kg/mol).…”

Section: Slot-die Coatingmentioning

confidence: 99%

Uniaxial Alignment of Conjugated Polymer Films for High‐Performance Organic Field‐Effect Transistors

et al. 2018

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Polymer semiconductors have been experiencing a remarkable improvement in electronic and optoelectronic properties, which are largely related to the recent development of a vast library of high-performance, donor-acceptor copolymers showing alternation of chemical moieties with different electronic affinities along their backbones. Such steady improvement is making conjugated polymers even more appealing for large-area and flexible electronic applications, from distributed and portable electronics to healthcare devices, where cost-effective manufacturing, light weight, and ease of integration represent key benefits. Recently, a strong boost to charge carrier mobility in polymer-based field-effect transistors, consistently achieving the range from 1.0 to 10 cm V s for both holes and electrons, has been given by uniaxial backbone alignment of polymers in thin films, inducing strong transport anisotropy and favoring enhanced transport properties along the alignment direction. Herein, an overview on this topic is provided with a focus on the processing-structure-property relationships that enable the controlled and uniform alignment of polymer films over large areas with scalable processes. The key aspects are specific molecular structures, such as planarized backbones with a reduced degree of conformational disorder, solution formulation with controlled aggregation, and deposition techniques inducing suitable directional flow.

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Section: Slot-die Coatingmentioning

confidence: 99%

Uniaxial Alignment of Conjugated Polymer Films for High‐Performance Organic Field‐Effect Transistors

et al. 2018

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“…Such ink engineering has recently been shown to generate high mobility devices based on C8‐BTBT . In particular, a distinct increase of performance by utilizing a solvent mixture rather than a single solvent has been reported for a range of semiconductors, including TIPS‐pentacene or diketopyrrolopyrrole (DPP)‐based polymers . This approach has frequently been combined with another effective method – the addition of a polymer additive to the printing solution.…”

Section: Introductionmentioning

confidence: 99%

“…Such ink engineering has recently been shown to generate high mobility devices based on C8-BTBT. [17] This approach has frequently been combined with another effective method -the addition of a polymer additive to the printing solution. [17] This approach has frequently been combined with another effective method -the addition of a polymer additive to the printing solution.…”

mentioning

confidence: 99%

High‐Mobility, Solution‐Processed Organic Field‐Effect Transistors from C8‐BTBT:Polystyrene Blends

Haase

Rocha

Hauenstein

et al. 2018

Adv Elect Materials

104

103

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record values exceeding 10 cm 2 V −1 s −1 have been reported. [3][4][5][6][7][8] Though these results are promising, some of these reported values suffer from overestimation, [9,10] require significant engineering efforts, [3] complex fabrication procedures, [4] or employ nonscalable fabrication techniques, [5] ultimately highlighting the need for alternative and potentially more industry-relevant processing methods. We believe that adjustments to existing solution coating methods rather than intensive technology engineering could result in a feasible and simple approach.Ink properties such as the solvents' boiling point, [11] solubility parameters, [12] or the solute concentration [13] can be tuned in order to control crystal growth and packing in a manner that provides favorable electrical characteristics. Such ink engineering has recently been shown to generate high mobility devices based on C8-BTBT. [14] In particular, a distinct increase of performance by utilizing a solvent mixture rather than a single solvent has been reported for a range of semiconductors, including TIPS-pentacene [15,16] or diketopyrrolopyrrole (DPP)-based polymers. [17] This approach has frequently been combined with another effective method -the addition of a polymer additive to the printing solution. This combination has been shown to significantly reduce the device-to-device variations and yielded improved transistor performances when applied to high-mobility small molecules, like TIPS-pentacene, [18] diF-TES-ADT, [8,19,20] or even C8-BTBT. [5,7,21,22] In this study, we explore various blends of the high-mobility semiconductor C8-BTBT with the inert polymer polystyrene (PS) with the objective of improving device-to-device uniformity and investigating the effect on device characteristics. We report improved film formation that results in the reduction of deviceto-device variations and the reliable fabrication of high-mobility organic field-effect transistors by a scalable, meniscus-guided coating method, and demonstrate OFETs based on C8-BTBT, that to the best of our knowledge show the highest intrinsic mobility so far reported. Results and Discussion Discussion of C8-BTBT-Based Devices in LiteratureIn the literature, the blending of C8-BTBT and PS led to improvements in the effective mobility of organic field-effect Organic field-effect transistors based on aligned small molecule semiconductors have shown high charge carrier mobilities in excess of 10 cm 2 V −1 s −1 . This makes them a viable alternative to amorphous inorganic semiconductors especially if a high reproducibility can be achieved. Here, the optimization of high mobility organic field-effect transistors based on the organic semiconductor 2,7-dioctyl[1]benzothieno[3,2-b] benzothiophene (C8-BTBT) via the addition of a polymer additive to the printing solution is reported. Specifically, films and devices are compared based on solutions of the neat semiconductor and the blend with polystyrene and shear-coated devices with excellent device characteristics and gate-voltage-ind...

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“…Such effect could lead to higher degree of aggregation and grain boundary effect and eventually improvement in charge transport leading to significantly enhanced mobility and lower threshold voltage, compared to its untreated counterpart. [ 52 ]…”

Section: Ofet Performance Evaluation Of Pdppt–dttmentioning

confidence: 99%

“…The decrement in full width at half maximum (FWHM) from 3.72 to 2.93 indicates an improvement in thin film crystallinity and nanofiber domain formation. [ 52,53 ] Furthermore, both the device hysteresis parameters, I hys and V hys , show an increase. Such increase in hysteresis upon OTS treatment is shown in some other polymers.…”

Section: Ofet Performance Evaluation Of Pdppt–dttmentioning

confidence: 99%

Reduced Threshold Voltages and Enhanced Mobilities in Diketopyrrolopyrrole–Dithienothiophene Polymer‐Based Organic Transistor by Interface Engineering

Patil

Takeda

Trang

et al. 2020

Physica Status Solidi (a)

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Flexible and low‐power consuming integrated circuits are some of the basic requirements for smart wearable devices. High mobility solution‐processed organic field‐effect transistors (OFETs) have the potential to make a big impact in printed electronic circuits, but their overall performance is currently limited by unusually high threshold voltages (Vth). Herein, systematic optimization of donor–acceptor conjugated polymer, based on dithienothiophene (DTT) and thiophene‐flanked diketopyrrolopyrrole (DPP), namely, PDPPT–DTT, OFETs by application of self‐assembled monolayers (SAMs) at the semiconductor–dielectric, and semiconductor–metal interfaces is reported. The results clearly exhibit that simultaneous application of octyltrichlorosilane (OTS) as semiconductor–dielectric interface modifying layer and pentafluorobenzene thiol (PFBT) as semiconductor–metal interface modifying layer results in significantly lower Vth and subthreshold slope values from −14.07 V and 13.26 (V Dec−1) to +1.06 V and 7.11 (V Dec−1), respectively. This tailored approach is also beneficial in enhancing hole mobility values by an order of magnitude from 0.01 to 0.5 cm2 V−1 s−1 along with the possibility of switching from hole accumulation mode (Vth = −3.75 V) to depletion mode (Vth = +1.06 V) through device engineering. Simultaneous interface engineering reveals OFET electronic properties can be fine‐tuned for robust circuits and low power electronic applications.

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Controlling aggregation and crystallization of solution processed diketopyrrolopyrrole based polymer for high performance thin film transistors by pre-metered slot die coating process

Cited by 20 publications

References 41 publications

Uniaxial Alignment of Conjugated Polymer Films for High‐Performance Organic Field‐Effect Transistors

Uniaxial Alignment of Conjugated Polymer Films for High‐Performance Organic Field‐Effect Transistors

High‐Mobility, Solution‐Processed Organic Field‐Effect Transistors from C8‐BTBT:Polystyrene Blends

Reduced Threshold Voltages and Enhanced Mobilities in Diketopyrrolopyrrole–Dithienothiophene Polymer‐Based Organic Transistor by Interface Engineering

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