Casting Control of Floating-films into Ribbon-shape Structure by modified Dynamic FTM

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

doi:10.1088/1742-6596/924/1/012014

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…In this context, we have improvised the conventional FTM by introducing the custom-made slider consisting of Teflon for providing the directionality during film spreading under the FTM. 37 Utilization of custom-made slider during film casting in the FTM led to the fabrication of largearea rectangular films (>2 cm × 20 cm), which we named ribbon-shaped FTM. 38 In this work, a dual approach pertaining to the optimization of synthetic parameters of CP under investigation in combination with fabrication of its large-areaoriented thin films by the ribbon-shaped FTM have been applied for the investigation of anisotropic charge transport.…”

Section: Introductionmentioning

confidence: 99%

“…Fabrication of large-area homogeneous thin films is highly desired for the acceleration of commercialization efforts of organic electronic devices. In this context, we have improvised the conventional FTM by introducing the custom-made slider consisting of Teflon for providing the directionality during film spreading under the FTM . Utilization of custom-made slider during film casting in the FTM led to the fabrication of large-area rectangular films (>2 cm × 20 cm), which we named ribbon-shaped FTM .…”

Section: Introductionmentioning

confidence: 99%

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Implication of Molecular Weight on Optical and Charge Transport Anisotropy in PQT-C12 Films Fabricated by Dynamic FTM

Tripathi

Sadakata

Gupta

et al. 2019

ACS Appl. Mater. Interfaces

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Large area (>20 cm × 2 cm)-oriented thin films of PQT-C12 with varying molecular weight and polydispersity index (PDI) were fabricated by the ribbonshaped floating film transfer method aiming toward their application as an active semiconductor element of organic field effect transistors (OFETs). Investigation on the influence of the molecular weight and PDI upon the extent of molecular alignment and anisotropic charge transport was systematically carried out. It has been demonstrated that high molecular weight in combination with low PDI not only leads to a very high optical anisotropy >10 but also high charge carrier anisotropy with a hole mobility of about 0.07 cm 2 /V•s for OFETs using parallel-oriented PQT-C12 thin films. Such a structure−property correlation is highly beneficial for the development of high performance organic electronic devices by synergistic and amicable tuning of the optoelectronic anisotropies and polymer synthetic variables.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Implication of Molecular Weight on Optical and Charge Transport Anisotropy in PQT-C12 Films Fabricated by Dynamic FTM

Tripathi

Sadakata

Gupta

et al. 2019

ACS Appl. Mater. Interfaces

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“…There is also an approach using surface tension. Conjugated polymer chains are floated onto water surface as a monolayer and then confined to obtain a thin film with aligned polymer chains [ 81 , 82 , 83 ]. These approaches using external forces provide in-plane alignment that is commonly not attainable through the aforementioned approaches.…”

Section: Design Of Conjugated Polymer Mo Systemsmentioning

confidence: 99%

Strain–Microstructure–Optoelectronic Inter-Relationship toward Engineering Mechano-Optoelectronic Conjugated Polymer Thin Films

et al. 2021

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Mechano-optoelectronic (MO) behavior indicates changes in optoelectronic properties in response to the applied mechanical deformation. The MO behavior can be employed to monitor the mechanical deformation of a targeted system by tracing its optoelectronic properties. Poly(3-hexylthiophene) and phenyl-C61-butyric acid methyl ester (P3HT/PCBM) blend thin films exhibited changes in direct current under tensile strain. Although optoelectronic properties and photovoltaic performance of P3HT/PCBM blends have been studied extensively and intensively, research required for MO properties has a fundamental difference from previous research mostly for solar cells. In research for MO systems, a greater extent of changes in optoelectronic properties under mechanical deformation is favorable. Herein, previous research for optoelectronic properties and mechanical properties of conjugated polymers will be reviewed from a perspective on MO properties. The microstructure of a conjugated polymer thin film plays a pivotal role in its optoelectronic properties and mechanical properties. Key parameters involved in the microstructure of conjugated polymer thin films will be addressed. A scalable process is required to broaden applications of MO systems. Potential challenges in the fabrication of MO conjugated polymer thin films will be discussed. Finally, this review is envisioned to provide insight into the design and manufacturing of MO conjugated polymer thin films.

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“…[14] Further, to provide unidirectionality, a custom-made assisting slider is used allowing unidirectional spreading of the polymer solution leading to large-area ribbon-shaped oriented thin films. [15,16] The most crucial parameter controlling the anisotropy of the thin films is viscosity of the liquid substrate, while the concentration of the polymer solution has a major impact on the thickness of the fabricated thin films. The distribution of orientation throughout the films has been reported earlier by our group.…”

Section: Introductionmentioning

confidence: 99%

“…The distribution of orientation throughout the films has been reported earlier by our group. [14,15,[17][18][19] But, there is still considerable uncertainty about the extent of vertical orientation and its impact on the performance of planar devices.…”

Section: Introductionmentioning

confidence: 99%

Vertical Distribution of Molecular Orientation and Its Implication on Charge Transport in Floating Films of Conjugated Polymers

Rai

Gaurav

Pradhan

et al. 2023

Physica Status Solidi (a)

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Fabrication of uniform and oriented thin films of conjugated polymers (CPs) with controlled thickness is essential for the implementation of organic devices. Over the years, unidirectional floating film transfer method (UFTM) has emerged as a facile technique for the fabrication of oriented thin films but its distribution of orientation in vertical (thickness) direction has not been explored yet. To investigate this, thin films of nonregioregular poly(3‐hexylthiophene) are fabricated using UFTM with different concentrations of CPs to obtain thickness variation from 11 to 47 nm. Thin films of 4% and 9% polymer solution have similar dichroic ratio of 5.5 but have an appreciable difference in film thickness of 12 and 47 nm where thicker films are disordered as probed by polarized absorption spectra. Organic field‐effect transistors fabricated using thinner films (12 nm) exhibit a saturated charge carrier mobility of 2.3 × 10−3cm2 V−1 s−1, an order of magnitude higher than its thicker (47 nm) counterpart. This difference in device performance can be attributed to the fact that charge transport is principally governed by the top polymer surface at air–polymer interface, which is found to be more disordered owing to the vertical distribution of orientation.

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Casting Control of Floating-films into Ribbon-shape Structure by modified Dynamic FTM

Cited by 8 publications

References 15 publications

Implication of Molecular Weight on Optical and Charge Transport Anisotropy in PQT-C12 Films Fabricated by Dynamic FTM

Implication of Molecular Weight on Optical and Charge Transport Anisotropy in PQT-C12 Films Fabricated by Dynamic FTM

Strain–Microstructure–Optoelectronic Inter-Relationship toward Engineering Mechano-Optoelectronic Conjugated Polymer Thin Films

Vertical Distribution of Molecular Orientation and Its Implication on Charge Transport in Floating Films of Conjugated Polymers

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