Molecular orientation and anisotropic charge transport in the large area thin films of regioregular Poly(3-alkylthiophenes) fabricated by ribbon-shaped FTM

Tripathi, Atul S.M.; Gupta, Rakesh; Sharma, Shubham; Nagamatsu, Shuichi; Pandey, Shyam S.

doi:10.1016/j.orgel.2020.105687

Cited by 11 publications

(2 citation statements)

References 45 publications

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“…It was reported that longer alkyl chains of P3AT and PBTTT favored side chain interdigitation. 39,40 The P3DT-b-C12-16K BCP had longer alkyl side chains and thus their side chain interdigitation probably enabled stronger interaction between these two blocks than the P3HT-b-C6-11K. As a result, P3DT-b-C12-16K was more readily able to form cocrystals in the as-cast state.…”

Section: Effect Of Alkyl Side Chains On the Crystallinementioning

confidence: 99%

Interrogating Cocrystallization and Microphase Segregation in Meticulously Engineered Rod–Rod Poly(thieno)thiophene-Based Block Copolymers for Organic Field-Effect Transistors

Zhao,

Zheng,

et al. 2024

Macromolecules

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Rod–rod block copolymers (BCPs) comprising different conjugated polymers are significant for meticulously tuning the two-phase transitions (microphase segregation and crystallization) and scrutinizing their structure–property relationships. However, in contrast to the extensively investigated conventional coil–coil BCPs, the investigation into the phase behaviors of rod–rod BCPs is limited theoretically and experimentally because of their semirigid characteristics. In this work, we synthesized a new family of poly(3-alkylthiophene)-block-poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (P3AT-b-PBTTT) with controlled molecular weights (MWs) and different alkyl side chains of either P3AT or PBTTT. We further examined the interplay between their cocrystallization (i.e., cocrystals of P3AT and PBTTT blocks) and microphase segregation (i.e., producing respective P3AT and PBTTT block crystal domains) by tuning the intrinsic (i.e., MWs and alkyl chains of P3AT and PBTTT) and extrinsic factors (i.e., thermal annealing and solvent) synergistically. Intriguingly, the larger MW of P3AT-b-PBTTT favors cocrystallization between P3AT and PBTTT blocks over their microphase segregation, which differs greatly from that of conventional coil–coil BCPs. Moreover, the closer interlayer lamellar spacing and side chain interdigitation between P3AT and PBTTT facilitated the formation of cocrystals. In contrast, thermal annealing at increased temperatures and slower solvent evaporation promoted microphase segregation between P3AT and PBTTT. The various crystalline structures of P3AT-b-PBTTT were closely connected to the device performance of field-effect transistors. This work highlights the robustness of molecular engineering and postprocessing collectively for tuning the cocrystallization and microphase segregation of all-conjugated BCPs.

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Section: Effect Of Alkyl Side Chains On the Crystallinementioning

confidence: 99%

Interrogating Cocrystallization and Microphase Segregation in Meticulously Engineered Rod–Rod Poly(thieno)thiophene-Based Block Copolymers for Organic Field-Effect Transistors

Zhao,

Zheng,

et al. 2024

Macromolecules

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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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Facile Fabrication and Characterization of Oriented and Multilayer Thin Films of Solution Processable Conjugated Polymer

Sharma

Nagamatsu

Singh

et al. 2023

Physica Status Solidi (a)

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Fabrication of multilayer thin films of solution‐processable organic semiconductors has great potential in organic electronics but adopting existing thin film techniques to attain this is highly cumbersome. In this work, a unique unidirectional floating film transfer method (UFTM) has been utilized, which allows the facile fabrication of large area and oriented thin films of conjugated polymers. Using this method, we have successfully fabricated and characterized multilayer and oriented thin films of regioregular poly(3‐hexylthiophene) without having any adverse effect on the underlying layers. Optical characterizations revealed that fabricated thin films are anisotropic with a dichroic ratio of 2.2 having a single layer thickness of 14.5 nm. X‐ray diffraction results demonstrated uniformity in the crystallinity of the multilayered thin film with comparable crystallite size and inter‐planar spacing with purely edge‐on molecular orientation. The organic field effect transistor fabricated using multilayer thin films also exhibits a uniform and saturated charge carrier mobility of about 0.1 cm2V‐1s‐1.This article is protected by copyright. All rights reserved.

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Molecular orientation and anisotropic charge transport in the large area thin films of regioregular Poly(3-alkylthiophenes) fabricated by ribbon-shaped FTM

Cited by 11 publications

References 45 publications

Interrogating Cocrystallization and Microphase Segregation in Meticulously Engineered Rod–Rod Poly(thieno)thiophene-Based Block Copolymers for Organic Field-Effect Transistors

Interrogating Cocrystallization and Microphase Segregation in Meticulously Engineered Rod–Rod Poly(thieno)thiophene-Based Block Copolymers for Organic Field-Effect Transistors

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

Facile Fabrication and Characterization of Oriented and Multilayer Thin Films of Solution Processable Conjugated Polymer

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