Solvent driven performance in thin floating-films of PBTTT for organic field effect transistor: Role of macroscopic orientation

Pandey, Manish; Pandey, Shyam S.; Nagamatsu, Shuichi; Hayase, Shuzi; Takashima, Wataru

doi:10.1016/j.orgel.2017.01.031

Cited by 57 publications

(62 citation statements)

References 40 publications

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“…Previously, we utilized pBTTT for thin‐film fabrication using FTM, and the results demonstrated that the judicious selection of the solvent plays an important role in the film formation. The utilization of high boiling point solvents like chlorobenzene led to the formation of isotropic films, while the use of a lower boiling point solvent such as chloroform resulted in oriented films exhibiting optical and electronic anisotropies . In this paper, we have demonstrated the macroscopic orientation of pBTTT by FTM, and the annealing of the FTM films at the liquid‐crystalline phase‐transition temperature led to a pronounced enhancement in the optical anisotropy.…”

Section: Introductionmentioning

confidence: 76%

“…It has been previously reported that FTM provides large‐scale‐oriented CP films, and the extent of the molecular orientation depends on subtle control of the film‐casting parameters, such as the viscosity, temperature of the liquid substrate, concentration of the polymer solution, and nature of the polymeric backbone . Unlike the LB film preparation method, the FTM does not require amphiphilic molecules and film compression since the formation of the floating film and the induction of the molecular orientation are simultaneous . It was also found that CPs with inherent liquid‐crystalline behavior processed by the FTM exhibit a molecular orientation in the films formed by lyotropic phase‐assisted self‐assembly during rapid solvent evaporation and solidification .…”

Section: Resultsmentioning

confidence: 99%

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Rapid Formation and Macroscopic Self‐Assembly of Liquid‐Crystalline, High‐Mobility, Semiconducting Thienothiophene

Pandey

Gowda

Nagamatsu

et al. 2018

Adv Materials Inter

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A synergistic approach to enhance charge‐carrier transport in organic semiconductors along with facile solution processing and high performance is crucial for the advancement of organic electronics. The floating film transfer method (FTM) is used as a facile and cost‐effective method for the fabrication of large‐scale, uniform, highly oriented poly[2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b]thiophene] (pBTTT C‐14) films under ambient conditions. Utilization of such oriented films as the active semiconducting layer in organic field‐effect transistors (OFETs) results in highly anisotropic charge‐carrier transport. Highly oriented, FTM‐processed pBTTT C‐14 thin films are characterized by polarized electronic absorption and Raman spectroscopy, atomic force microscopy, out‐of‐plane X‐ray diffraction, and grazing incident X‐ray diffraction (GIXD) measurements. The GIXD data indicate an edge‐on orientation, which is highly desirable for planar devices such as OFETs. OFETs built using the oriented films show a mobility anisotropy of 10 and the highest mobility is 1.24 cm2 V−1 s−1 along the backbone orientation, which is among the highest value reported for this class of materials using a similar device configuration.

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Section: Introductionmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Rapid Formation and Macroscopic Self‐Assembly of Liquid‐Crystalline, High‐Mobility, Semiconducting Thienothiophene

Pandey

Gowda

Nagamatsu

et al. 2018

Adv Materials Inter

Self Cite

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“…Thin‐film OFET fabrication imposes fewer solubility requirements than in OPV applications, typically having to accommodate only one solute under dilute conditions (<10 mg mL −1 ). Much research effort has focused on aligning crystallites within the OSC active layer, including directing the evaporation of the deposition solvent. These range from simple methods, such as off‐center spin coating and drying under a tunnel‐like structure, to complex flow chambers .…”

Section: Use Of Solvent Additives In Related Electronic Technologiesmentioning

confidence: 99%

Solvent Additives: Key Morphology‐Directing Agents for Solution‐Processed Organic Solar Cells

et al. 2018

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Organic photovoltaics (OPV) have the advantage of possible fabrication by energy-efficient and cost-effective deposition methods, such as solution processing. Solvent additives can provide fine control of the active layer morphology of OPVs by influencing film formation during solution processing. As such, solvent additives form a versatile method of experimental control for improving organic solar cell device performance. This review provides a brief history of solution-processed bulk heterojunction OPVs and the advent of solvent additives, putting them into context with other methods available for morphology control. It presents the current understanding of how solvent additives impact various mechanisms of phase separation, enabled by recent advances in in situ morphology characterization. Indeed, understanding solvent additives' effects on film formation has allowed them to be applied and combined effectively and synergistically to boost OPV performance. Their success as a morphology control strategy has also prompted the use of solvent additives in related organic semiconductor technologies. Finally, the role of solvent additives in the development of next-generation OPV active layers is discussed. Despite concerns over their environmental toxicity and role in device instability, solvent additives remain relevant morphological directing agents as research interests evolve toward nonfullerene acceptors, ternary blends, and environmentally sustainable solvents.

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“…Floating film transfer method (FTM) is a modified spin coating process. Pandey et al [69] demonstrated that judicious selection of solvents with high boiling point or low boiling point during FTM could result in static casting (S-FTM) or dynamic casting (D-FTM). As Figure 2(a) (left) shows, PBTTT-C14/chlorobenzene solution spread throughout the entire surface of the substrate, forming floating-film after the slow evaporation of chlorobenzene in the S-FTM processing.…”

Section: Introductionmentioning

confidence: 99%

Review on flexible photonics/electronics integrated devices and fabrication strategy

Cai

Han

Wang

et al. 2018

Sci. China Inf. Sci.

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In recent years, to meet the greater demand for next generation electronic devices that are transplantable, lightweight and portable, flexible and large-scale integrated electronics attract much more attention have been of interest in both industry and academia. Organic electronics and stretchable inorganic electronics are the two major branches of flexible electronics. With the semiconductive and flexible properties of the organic semiconductor materials, flexible organic electronics have become a mainstay of our technology. Compared to organic electronics, stretchable and flexible inorganic electronics are fabricated via mechanical design with inorganic electronic components on flexible substrates, which have stretchability and flexibility to enable very large deformations without degradation of performance. This review summarizes the recent progress on fabrication strategies, such as hydrodynamic organic nanowire printing and inkjet-assisted nanotransfer printing of flexible organic electronics, and screen printing, soft lithography and transfer printing of flexible inorganic electronics. In addition, this review considers large-scale organic and inorganic flexible electronic systems and the future applications of flexible and stretchable electronics.

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Solvent driven performance in thin floating-films of PBTTT for organic field effect transistor: Role of macroscopic orientation

Cited by 57 publications

References 40 publications

Rapid Formation and Macroscopic Self‐Assembly of Liquid‐Crystalline, High‐Mobility, Semiconducting Thienothiophene

Rapid Formation and Macroscopic Self‐Assembly of Liquid‐Crystalline, High‐Mobility, Semiconducting Thienothiophene

Solvent Additives: Key Morphology‐Directing Agents for Solution‐Processed Organic Solar Cells

Review on flexible photonics/electronics integrated devices and fabrication strategy

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