In-situ orientation and crystal growth kinetics of P3HT in drop cast P3HT:PCBM films

Huq, Abul; Ammar, Ali; Al-Enizi, Abdullah M.; Karim, Alamgir

doi:10.1016/j.polymer.2017.01.067

Cited by 10 publications

(3 citation statements)

References 61 publications

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“…The ordered structure is crucial for the electronic properties of these materials, and there are many reports focusing on methods to achieve and improve the ordered structure during processing with different levels of success. − Here, we report a simple strategy for self-assembly of conjugated polymers in the solution state. Our system consists of a low-molecular-weight gelator (LMWG) and a model conjugated polymer, poly(3-hexylthiophene) (P3HT).…”

Section: Introductionmentioning

confidence: 99%

“…Several techniques have been pursued to control the thin-film microstructure of conjugated polymers, for example, (i) spin, dip, and blade coatings, − and (ii) drop-casting, solution-shearing flow-assisted crystallization, and nanoimprint lithographic techniques . Starting with preformed self-assembled structures or organogels that consist of large percolating networks of self-assembled polymer nanofibrils results in better electrical conductivity in the fabricated thin film compared to the films cast from polymer solutions. ,− …”

Section: Introductionmentioning

confidence: 99%

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Nanoscale Self-Assembly of Poly(3-hexylthiophene) Assisted by a Low-Molecular-Weight Gelator toward Large-Scale Fabrication of Electrically Conductive Networks

Lakdusinghe

Abbaszadeh

Mishra

et al. 2021

ACS Appl. Nano Mater.

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Achieving self-assembly of conjugated polymers is necessary to harness their charge transport properties in various applications, including field-effect transistors, sensors, and conductive gels for biomedical applications. Although many processes have been investigated, there are still opportunities for developing new strategies that can lead to materials with improved performances. Particularly, large-scale fabrication of three-dimensional conductive networks formed by the self-assembly of conjugated polymers and low-molecular-weight gelators (LMWGs), but with conjugated polymers at much lower quantity, would be advantageous. LMWGs can be selected from an extensive library of available systems and can be directed to self-assemble in various conditions. However, the simultaneous self-assembly of LWMGs and conjugated polymers is not fully understood. Here, we report a simple pathway for the self-assembly of poly(3-hexylthiophene) (P3HT), a conjugated polymer, in chloroform in the presence of di-Fmoc-l-lysine, an LMWG. Di-Fmoc-l-lysine was selected as the LMWG because it does not have significant interactions with P3HT. P3HT and di-Fmoc-l-lysine in chloroform form gels with decreasing temperature. UV–vis spectroscopy provides an insight into the photophysical response of the gelation process, revealing the self-assembly of P3HT in the gel network. The scattering experiments further capture the self-assembly of the P3HT network. The nanofibrillar microstructure has been captured using atomic force microscopy (AFM) for the gels without and with P3HT, where both P3HT and di-Fmoc-l-lysine form nanofibers independently. Both these nanofibers coexist and intermingle, displaying conductive domains in the dried films captured by conductive AFM. The conductive nanofibers form a percolated network in the dried samples, leading to bulk electrical conductivity similar to that of pristine P3HT films. This is achieved with only 20% P3HT content and the balance insulating di-Fmoc-l-lysine molecules. Our results provide a fundamental understanding of the self-assembly of P3HT in the presence of an LMWG, resulting in a conductive nanofibrillar network. Such knowledge can readily be implemented in other conjugated polymeric systems. The approach presented here has potential applications towards fabricating conductive gels for biomedical and sensor applications and large-scale processing of thin films for optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoscale Self-Assembly of Poly(3-hexylthiophene) Assisted by a Low-Molecular-Weight Gelator toward Large-Scale Fabrication of Electrically Conductive Networks

Lakdusinghe

Abbaszadeh

Mishra

et al. 2021

ACS Appl. Nano Mater.

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show abstract

“…Currently, various chemical and thermal post treatment methods are used for this purpose, e.g. [11][12][13]. These methods are successful to some extent, but are sometimes tedious, energy-intensive, or environmentally disfavored and overall are not in line with high volume printing of such devices.…”

Section: Introductionmentioning

confidence: 99%

Facile and low-cost mechanical techniques for the fabrication of solution-processed polymer and perovskite thin film transistors

Habibi

Eslamian

2018

J. Phys. Commun.

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Low-temperature solution-processed polymer and perovskite thin film field effect transistors (FETs) are attractive, as they are compatible with flexible and printed electronics. Given that chemical treatment of the FET channel is expensive and tedious, and sometimes damages the underneath (dielectric) solution-processed layers, in this work, two facile and scalable mechanical treatment techniques are proposed. In the case of polymer FET, the wet spun film was excited by ultrasonic vibration imposed on the substrate. It is demonstrated that the micromixing effect induced by the ultrasonic radiation results in disentanglement, reorganization, and recrystallization of the polymer chains in the wet film. Ultrasonic vibration also improves the film leveling and uniformity and enhances the charge mobility of the channel of the polymer FET. In the case of the perovskite FET, we found that nitrogen blowing over the spun sample of the perovskite solution is a facile, yet effective substitution for the conventional anti-solvent treatment, commonly used to control the solvent evaporation rate. By nitrogen blowing, we achieved a uniform film of perovskite deposited on a solution-processed dielectric layer with domain sizes up to several hundreds of nanometers. By applying these techniques, the linear charge mobility of 0.041 cm 2 Vs −1 and 0.055 cm 2 Vs −1 were obtained for polymer and perovskite FETs under illumination, respectively. It is shown that while the performance of the polymer FET is only slightly sensitive to illumination, the perovskite FET performs well only under illumination.

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Synthesis and Characterization of Poly(o-anisidine-co-o-toluidine)/PCBM Composites for Optoelectronic Applications

Alsulami,

Anbari,

Hussein

2024

J Inorg Organomet Polym

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In-situ orientation and crystal growth kinetics of P3HT in drop cast P3HT:PCBM films

Cited by 10 publications

References 61 publications

Nanoscale Self-Assembly of Poly(3-hexylthiophene) Assisted by a Low-Molecular-Weight Gelator toward Large-Scale Fabrication of Electrically Conductive Networks

Nanoscale Self-Assembly of Poly(3-hexylthiophene) Assisted by a Low-Molecular-Weight Gelator toward Large-Scale Fabrication of Electrically Conductive Networks

Facile and low-cost mechanical techniques for the fabrication of solution-processed polymer and perovskite thin film transistors

Synthesis and Characterization of Poly(o-anisidine-co-o-toluidine)/PCBM Composites for Optoelectronic Applications

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