Optical Anisotropy and Strong <i>H</i>‐Aggregation of Poly(3‐Alkylthiophene) in a Surface Monolayer

Wang, Fanji; Hashimoto, Kazuhito; Tajima, Kazuo

doi:10.1002/adma.201502339

Cited by 17 publications

(20 citation statements)

References 51 publications

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“…This value is only a little higher than the value calculated from the molecular formula (0.026 based on the assumption of the average n of 14). This is in contrast to P3BT-F 17 in which F/C atomic ratio at the film surface is much higher than those calculated from the molecular formula (0.27 vs. 0.11), suggesting the surface is preferentially covered with the fluoroalkyl chains [10]. Therefore, this result suggests that P3BT-Si segregate on the surface of PS film but P3BT-Si at the surface does not have strong preferential surface display of the trisiloxane moiety.…”

Section: Resultscontrasting

confidence: 63%

“…Note that complete conversion of the chain ends from -Br to -H would be possible by the reduction reaction with NaBH 4 [14]. However, we did not observe significant influence of -Br/-H ratio on the surface segregation behavior and the molecular orientation in the case of P3BT-F 17 [9,10]. Therefore, we speculate the effect of the end group is also small for P3BT-Si.…”

Section: Resultsmentioning

confidence: 62%

“…This surface segregated monolayer (SSM) is a useful approach to modify the surface properties of the organic semiconducting films [1,2], and to alter the organic interfaces of donor/acceptor (D/A) in planar heterojunction (PHJ) organic photovoltaics (OPVs) [3][4][5] and the organic/metal interfaces in bulk heterojunction (BHJ) OPVs [6][7][8]. In addition, polymer-based SSM molecules showed strong preference of the molecular orientations in the surface layers depending on the substituent positions of the functionality with the low surface energy [9][10][11]. For example, poly (3-butylthiophene) with an end group of fluoroalkyl chain (P3BT-F 17 in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Poly(3-butylthiophene) with Trisiloxane End Group and Its Surface Segregation Behavior in Thin Films

Wang

Hashimoto

Segawa

et al. 2018

J. Photopol. Sci. Technol.

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A poly(3-butylthiophene) derivative with an end group of 1,1,1,3,3,5,5-heptamethyl trisiloxane group (P3BT-Si) was synthesized for the application of surface segregated monolayer (SSM) in polymer films. The surface segregation behaviors, thermal properties and chain orientation of P3BT-Si were investigated. The formation of the surface layer of P3BT-Si was confirmed in the blend films with polystyrene. In contrast to the fluoroalkylterminated polymer (P3BT-F17) that shows strong end-on orientation in the SSM with high crystallinity, P3BT-Si showed edge-on orientation in the SSM with low crystallinity. The difference can be attributed to the more flexible structure of trisiloxane group than the fluoroalkyl chain.

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Section: Resultscontrasting

confidence: 63%

Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Poly(3-butylthiophene) with Trisiloxane End Group and Its Surface Segregation Behavior in Thin Films

Wang

Hashimoto

Segawa

et al. 2018

J. Photopol. Sci. Technol.

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“…Face‐on orientations of P3HT in thin films can be induced by the proper choice of solvent, mechanical strain, and surface rubbing of the films . There are still limited examples of the end‐on orientation of polymer chains in films . The molecular orientation can strongly affect the photophysical processes in PHJs in many ways, as discussed in Sections and .…”

Section: Preparation and Characterization Of Planar Heterojunctionsmentioning

confidence: 99%

“…SSMs were originally developed to form self‐organized buffer layers at the electrode interfaces in OPVs . Later, it was shown that proper design of SSM molecules can control the molecular orientation, structural order, and functionalities at the surface of the films . Furthermore, the electronic structures of the PHJ at the interface can be tuned through the molecular dipoles or the energy structures of the monolayers .…”

Section: Preparation and Characterization Of Planar Heterojunctionsmentioning

confidence: 99%

Organic Planar Heterojunctions: From Models for Interfaces in Bulk Heterojunctions to High‐Performance Solar Cells

2016

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Recent progress regarding planar heterojunctions (PHJs) is reviewed, with respect to the fundamental understanding of the photophysical processes at the donor/acceptor interfaces in organic photovoltaic devices (OPVs). The current state of OPV research is summarized and the advantages of PHJs as models for exploring the relationship between organic interfaces and device characteristics described. The preparation methods and the characterization of PHJ structures to provide key points for the appropriate handling of PHJs. Next, we describe the effects of the donor/acceptor interface on each photoelectric conversion process are reviewed by examining various PHJ systems to clarify what is currently known and not known. Finally, it is discussed how we the knowledge obtained by studies of PHJs can be used to overcome the current limits of OPV efficiency.

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An Efficient One‐Arrow‐Two‐Hawks Strategy Achieves High Efficiency and Stable Batch Variance for Benzodifuran‐based Polymer Solar Cells

Zheng

Yue

et al. 2023

Adv Funct Materials

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With the development of organic solar cells (OSCs), the high-performance and stable batch variance are becoming a new challenge for designing polymer donors. To obtain high photovoltaic performance, adopting polymers with high molecular weight as donors is an ordinary strategy. However, the high molecular weight need to subtly control the reaction time and state, inevitably caused batch-to-batch variations. Herein, a strategy of steric effect is applied to benzodifuran (BDF)-based polymer by introducing different positions of Cl atom, producing two polymers PBDFCl-1 and PBDFCl-2. The more twisted side chains conformation not only achieve the control of moderate molecular weight for PBDFCl-2, but also easily form molecular stacking through adopting BDF unit and maintain sufficient polymeric crystallinity. Due to the optimized stacking mode and good blend miscibility, PBDFCl-2-based device exhibitsa more elegant power conversion efficiency (PCE) of 17.00% compared to PBDFCl-1-based device. This is the highest efficiency record for BDF-based binary OSCs. Meanwhile, the PCE device variation of the different molecular weights for PBDFCl-2 is little, indicating the reduction of the batch variation. Therefore, smartly using steric effect of Cl atom in strong crystalline BDF unit can form efficient molecular stacking regulations and realize the coordination of high-performance and stable batch variance.

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Optical Anisotropy and Strong H‐Aggregation of Poly(3‐Alkylthiophene) in a Surface Monolayer

Abstract: Slab optical waveguide absorption spectra reveal that surface segregated monolayers of a vertically oriented poly(3-buthylthiophene) derivative have large optical anisotropy, and that confinement of the polymer chains in the isolated monolayer causes strong H-aggregation.

Cited by 17 publications

References 51 publications

Synthesis of Poly(3-butylthiophene) with Trisiloxane End Group and Its Surface Segregation Behavior in Thin Films

Synthesis of Poly(3-butylthiophene) with Trisiloxane End Group and Its Surface Segregation Behavior in Thin Films

Organic Planar Heterojunctions: From Models for Interfaces in Bulk Heterojunctions to High‐Performance Solar Cells

An Efficient One‐Arrow‐Two‐Hawks Strategy Achieves High Efficiency and Stable Batch Variance for Benzodifuran‐based Polymer Solar Cells

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