Cationic Polyfluorene-<i>b</i>-Neutral Polyfluorene “Rod–Rod” Diblock Copolymers

Gutacker, Andrea; Lin, Chi-Yen; Ying, Lei; Nguyen, Thuc‐Quyen; Scherf, Ullrich; Bazan, Guillermo C.

doi:10.1021/ma202738t

Cited by 43 publications

(33 citation statements)

References 37 publications

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“…Apart from BHJ, interlayer also plays an important role in achieving high FF. A consensus on the criteria for optimal interfacial layers concerns: (i) suitable energy levels to align with BHJ materials to reduce the contact energy barrier; (ii) constructive interfacial dipole interactions to warrant a sufficient built‐in voltage ( V bi ); (iii) good solubility or dispersity to guarantee film formation; (iv) suitable wettability on underneath layers to avoid pin holes; suitable wettability for later processing solvents to simplify fabrication procedures . On this basis, to improve photovoltaic performance, morphology control and interlayer design become two key topics in OSC society.…”

Section: Summary Of Parameters Htls Involved In This Workmentioning

confidence: 99%

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

et al. 2018

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With rapid development for tens of years, organic solar cells (OSCs) have attracted much attention for their potential in practical applications. As an important photovoltaic parameter, the fill factor (FF) of OSCs stands for the effectiveness of charge generation and collection, which significantly depends on the properties of the interlayer and active layer. Here, a facile and effective strategy to improve the FF through hole-transporting layer (HTL) modification is demonstrated. By mixing WO nanoparticles with a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) emulsion, the surface free energy of the HTL is improved and the morphology of the active layer is optimized. Benefiting from increased carrier lifetime, a device based on WO :PEDOT:PSS HTL exhibits a boosted performance with an FF of 80.79% and power conversion efficiency of 14.57% PCE. The results are certified by the National Institute of Metrology (NIM), which, to date, are the highest values in this field with certification. This work offers a simple and viable option of HTL modification to realize highly efficient OSCs.

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Section: Summary Of Parameters Htls Involved In This Workmentioning

confidence: 99%

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

et al. 2018

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“…The polyelectrolyte triblock copolymer was investigated as an electron injection layer for Al in polymer light emitting diodes (PLEDs) and was found to provide devices with similar efficiencies as those achieved using a less stable Ba/Al cathode. Additionally, polyelectrolyte diblock copolymers as well as PF‐ b ‐P3HT have been prepared in a similar fashion. The structures of other fully conjugated block copolymers prepared by the polymerization of heterobifunctional AB‐type monomers are shown in Figure .…”

Section: Synthetic Strategies For the Preparation Of Fully Conjugatedmentioning

confidence: 99%

25th Anniversary Article: No Assembly Required: Recent Advances in Fully Conjugated Block Copolymers

Robb

Hawker

2013

Advanced Materials

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Fully conjugated block copolymers have emerged as promising materials that combine semiconducting properties with the ability to self-assemble at the nanoscale. The convergence of these two features has tremendous implications for a number of fundamental molecular assembly and transport questions, while also offering unique advantages for a variety of applications. For example, a nanostructured active layer in organic photovoltaic (OPV) devices may provide for efficient charge separation while simultaneously affording continuous, unimpeded pathways for charge carriers to migrate to their respective electrodes within each individual microphase. This review details the recent progress made in the preparation and application of fully conjugated block copolymers and serves as a comprehensive reference for the materials that have been reported in the literature to date. Focus is placed on fully conjugated block copolymers prepared using chemistries that are relevant to high-performance polymers in organic electronics research, for example Stille, Suzuki-Miyaura, and Yamamoto coupling.

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“…Optimization of these devices is nontrivial and processing conditions that produce optimal devices for the homopolymer constituents are a poor guide for the block copolymer devices. Relatively few reports discuss the interplay between crystallization of the constituent blocks in these types of rod–rod block copolymers . Additional research is needed to understand the relationship between processing, morphology, and optoelectronic properties in these systems.…”

Section: Introductionmentioning

confidence: 99%

Control of all‐conjugated block copolymer crystallization via thermal and solvent annealing

Smith

Stewart

Yager

et al. 2014

J Polym Sci B Polym Phys

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Control of the crystallization of conjugated polymers is of critical importance to the performance of organic electronics, such as organic photovoltaic devices, due to the effect on charge separation and transport, particularly for allpolymer devices. The block copolymer poly(3-dodecylthiophene)-block-poly(9,9-dioctylfluorene) (P3DDT-b-PF), which has matched crystallization temperatures for each block, is used to study the effects of processing history on resulting crystallization. For longer annealing times and rapid quenching to room temperature, P3DDT crystals are preferred whereas for shorter annealing times and slower quenching, PF crystals are preferred. Both crystal forms are evidenced for long annealing time and slow quenching. Additionally, for room temperature annealing in the presence of a chloroform vapor, PF crystals are found in the PF b phase with the predominant crystal peak oriented perpendicular to the thermally annealed case. These results will provide guidance for optimizing annealing strategies for future donor/acceptor block copolymer photovoltaic devices. V C 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 900-906

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Cationic Polyfluorene-b-Neutral Polyfluorene “Rod–Rod” Diblock Copolymers

Cited by 43 publications

References 37 publications

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

25th Anniversary Article: No Assembly Required: Recent Advances in Fully Conjugated Block Copolymers

Control of all‐conjugated block copolymer crystallization via thermal and solvent annealing

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