High field-effect mobility in oriented thin films of D-A type semiconducting polymers by engineering stable interfacial system

Sharma, Shubham; Vats, Ajendra Kumar; Tang, Luping; Kaishan, Feng; Toyoda, Jumpei; Nagamatsu, Shuichi; Andou, Yoshito; Tamagawa, Masaaki; Tanaka, Hirofumi; Pandey, Manish; Pandey, Shyam S.

doi:10.1016/j.cej.2023.143932

Cited by 21 publications

(9 citation statements)

References 70 publications

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“…At the same time, least material wastage and multilayer film fabrication by solution-based approach are its added advantages. The extent of the molecular orientation under UFTM can be controlled by controlling the film fabrication parameters like polymer concentration, temperature and viscosity of the liquid substrate [37]. It has been reported by our group previously that for RR-P3HT, a liquid substrate consisting of EG and GL in a 3:1 ratio gives the highest orientation, which has been used for the present work for the optimization of UFTM-processed thin films in this present work.…”

Section: Uftm Fabricated Thin Filmsmentioning

confidence: 99%

Clarifying the Dominant Role of Crystallinity and Molecular Orientation in Differently Processed Thin Films Regioregular poly(3-Hexylthiophene)

Gaurav,

Rai,

Singh

et al. 2024

Preprint

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Conjugated polymers (CPs) offer potentials for sustainable semiconductor devices due to their low cost, and inherent molecular self-assembly. Enhanced crystallinity and molecular orientation in thin films of solution-processable CPs have significantly improved organic electronic device per-formance. In this work, three methods namely spin-coating, dip-coating, and unidirectional float-ing-film transfer method (UFTM) were utilized with their parametric optimization for fabricating RR-P3HT films. These films were then utilized for their characterization via optical and micro-structural analysis to elucidate dominant roles of molecular orientation, and crystallinity in con-trolling charge transport in organic field-effect transistors (OFETs). OFETs fabricated by RR-P3HT thin films using spin-coating and dip-coating displayed field-effect mobility (μ) of 8.0 × 10-4 cm2V-1s-1 and 1.3 × 10-3 cm2V-1s-1, respectively. This two-time enhancement in (µ for dip-coated films was attributed to its enhanced crystallinity. Interestingly, UFTM films based OFETs demon-strated μ of 7.0 × 10-2 cm2V-1s-1, >100 times increment as compared to its spin-coated counterpart This superior device performance is attributed to synergistic influence of higher crystallinity and molecular orientation. Since the crystallinity of dip-coated and UFTM-thin films are similar ~50 times improved µ of UFTM thin films suggest a dominant role of molecular orientation as com-pared to crystallinity in controlling the charge transport.

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Section: Uftm Fabricated Thin Filmsmentioning

confidence: 99%

Clarifying the Dominant Role of Crystallinity and Molecular Orientation in Differently Processed Thin Films Regioregular poly(3-Hexylthiophene)

Gaurav,

Rai,

Singh

et al. 2024

Preprint

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“…It is needless to say that a J-type aggregation and their uniaxial orientation in hybrid material thin film leads to an enhanced charge transport in planar devices. 40…”

Section: Characterization Of Dpp-ttt/c 3 N 5 Blend Solutionmentioning

confidence: 99%

Template-Assisted Assembly of DPP-TTT over a Hydrophilic Liquid Subphase toward Enhanced Charge Transport in Organic Field-Effect Transistors

Shyam,

Jana,

Manaka

et al. 2024

ACS Appl. Polym. Mater.

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The progress in flexible electronics significantly benefits from improvements in charge transport within organic field-effect transistors (OFETs). The techniques used to incorporate organic conjugated polymers (CPs) into devices greatly influence their performance. In this study, we introduce an innovative method that utilizes the flexibility and solutionprocessing capabilities of donor−acceptor (D−A) type CPs, combined with the electrical conductivity and durability of twodimensional (2D) organic materials in a composite mixture. Furthermore, during the production of thin films via the "unidirectional floating film transfer method (UFTM)", it was observed that 2D organic C 3 N 5 nanosheets enhance the organization of the D−A polymer, poly[2,5-(2-octyl-dodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl) thieno[3,2-b] thiophene)] (DPP-TTT), on a hydrophilic liquid base, acting as a structural scaffold. This approach promotes the development of well-ordered DPP-TTT arrays, improving π−π stacking and intermolecular forces, which are essential for efficient charge transport. The OFETs crafted using this technique show a remarkable increase in charge carrier mobility, up to 0.41 cm 2 /(V s), with on/off ratios of 10 4 and superior operational durability. Our findings highlight the effectiveness of scaffold-assisted assembly on a liquid phase and the combined benefits of D−A polymers with 2D organic materials, offering a powerful approach for creating organic semiconductors with enhanced electrical characteristics. This opens promising pathways for advancing high-performance flexible electronic devices.

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“…One such method, known as Unidirectional Floating-Film Transfer Method (UFTM) developed by our group is an excellent film fabrication method for the deposition of large-area thin films of SCP (Figure a, Supporting Video 1). − A drop (∼10 μL) of SCP solution is dropped onto the hydrophilic liquid substrate, facilitating controlled spreading; as the solvent gradually evaporates, resulting in a solid floating thin film. The efficacy of this method lies in the independent control on film formation and their transfer on any desired substrate enabling facile LbL coating without hampering the underlying layers …”

Section: Introductionmentioning

confidence: 99%

High-Density, Nonvolatile, Flexible Multilevel Organic Memristor Using Multilayered Polymer Semiconductors

Sharma,

Pandey,

Nagamatsu

et al. 2024

ACS Appl. Mater. Interfaces

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Nonvolatile organic memristors have emerged as promising candidates for next-generation electronics, emphasizing the need for vertical device fabrication to attain a high density. Herein, we present a comprehensive investigation of highperformance organic memristors, fabricated in crossbar architecture with PTB7/Al-AlO x -nanocluster/PTB7 embedded between Al electrodes. PTB7 films were fabricated using the Unidirectional Floating Film Transfer Method, enabling independent uniform film fabrication in the Layer-by-Layer (LbL) configuration without disturbing underlying films. We examined the charge transport mechanism of our memristors using the Hubbard model highlighting the role of Al-AlO x -nanoclusters in switching-on the devices, due to the accumulation of bipolarons in the semiconducting layer. By varying the number of LbL films in the device architecture, the resistance of resistive states was systematically altered, enabling the fabrication of novel multilevel memristors. These multilevel devices exhibited excellent performance metrics, including enhanced memory density, high on−off ratio (>10 8 ), remarkable memory retention (>10 5 s), high endurance (87 on−off cycles), and rapid switching (∼100 ns). Furthermore, flexible memristors were fabricated, demonstrating consistent performance even under bending conditions, with a radius of 2.78 mm for >10 4 bending cycles. This study not only demonstrates the fundamental understanding of charge transport in organic memristors but also introduces novel device architectures with significant implications for high-density flexible applications.

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High field-effect mobility in oriented thin films of D-A type semiconducting polymers by engineering stable interfacial system

Cited by 21 publications

References 70 publications

Clarifying the Dominant Role of Crystallinity and Molecular Orientation in Differently Processed Thin Films Regioregular poly(3-Hexylthiophene)

Clarifying the Dominant Role of Crystallinity and Molecular Orientation in Differently Processed Thin Films Regioregular poly(3-Hexylthiophene)

Template-Assisted Assembly of DPP-TTT over a Hydrophilic Liquid Subphase toward Enhanced Charge Transport in Organic Field-Effect Transistors

High-Density, Nonvolatile, Flexible Multilevel Organic Memristor Using Multilayered Polymer Semiconductors

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