Regulation of microstructure and charge transport properties of cyclopentadiene-based conjugated polymers <i>via</i> side-chain engineering

Ma, Jianeng; He, Qiao; Xue, Zhongyuan; Sou, Hou Lon; Han, Yang; Zhong, Hongliang; Pietrangelo, Agostino; Heeney, Martin; Fei, Zhuping

doi:10.1039/d4tc00258j

Cited by 3 publications

(1 citation statement)

References 56 publications

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“…Conjugated polymers have found applications in numerous types of electronic devices, including organic light-emitting diodes, − organic thin-film transistors, , and organic solar cells; − many of the recent advances in organic electronics were only made possible through the synthesis of conjugated polymers with new or improved optoelectronic properties. As a representative example, record-setting OSC efficiency was only achieved through the development of PM6, a conjugated polymer whose optical and physicochemical properties are both highly synergistic with those of the nonfullerene acceptor Y6. − The combination of good charge carrier mobilities with easily tunable optical bandgaps, mechanical robustness, and good film-forming properties has now made conjugated polymers indispensable in many organic electronic applications. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis of Conjugated Polymers: Comparing the Indophenine Reaction with Traditional Methods

Faleiro Berbigier,

Kelly

2024

ACS Appl. Polym. Mater.

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Conjugated polymers are an important class of materials whose development underpins many recent advances in organic electronics. Traditionally, these polymers have been synthesized by transition-metal-catalyzed cross-couplings using organometallic reagents (e.g., Stille couplings). Although direct heteroarylation polymerization (DHAP) dispenses with the organometallic intermediates, DHAP is still a metal-catalyzed coupling, requiring both catalyst optimization and purification to remove trace metal contaminants. In contrast, a recent report from our group demonstrated that the indophenine reaction can be used as a metal-free method to prepare conjugated polymers; however, from this initial proof-of-concept study, it was not clear how it compared to other methods of conjugated polymer synthesis. Therefore, in this report, we synthesized the same polymer using three distinctly different approaches: Stille coupling, DHAP, and the indophenine reaction. This allows us to directly compare the three methodologies; we find that each offers distinct trade-offs in terms of atom economy, defects, and molecular weight.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Conjugated Polymers: Comparing the Indophenine Reaction with Traditional Methods

Faleiro Berbigier,

Kelly

2024

ACS Appl. Polym. Mater.

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Modulating Aggregation Behavior by Ternary Strategies for Efficient and Stable Thick‐Film Organic Solar Cells

Xu,

Wang,

Jeong

et al. 2024

Small

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Functional third components targeted to improve a specific property of organic solar cells is an effective strategy. However, introducing a third component to simultaneously improve efficiency and stability and achieve good performance in thick‐film devices has rarely been reported. Herein, low diffusion third components IDCN and ID2CN are reported to achieve a power conversion efficiency (PCE) of 18.08% and a high short‐circuit current (J SC) of 27.82 mA cm−2, one of the highest values based on PM6:Y6. They increase light harvesting in the range of 400–500 nm while enhancing energy transfer via Förster resonance energy transfer (FRET). A tightly ordered molecular arrangement is achieved by modulating the preaggregation and film formation kinetics of Y6, which enhance exciton dissociation and charge transport. Moreover, the low‐diffusion third component can effectively restrict the diffusion of Y6 to improve the morphology stability, and the T90 lifetime is increased from 689 to 1545 h. In 300 nm thick‐film devices, PM6:ID2CN:Y6 achieves a PCE of 15.01%, much higher than PM6:Y6's 12.83%, demonstrating the great potential of ID2CN in thick‐film devices.

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Large Enhancement of Photoluminescence Obtained in Thin Polyfluorene Films of Optimized Microstructure

Todor-Boer,

Farcău,

Botiz

2024

Polymers

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There is a clearly demonstrated relationship between the microstructure, processing and resulting optoelectronic properties of conjugated polymers. Here, we exploited this relationship by exposing polyfluorene thin films to various solvent vapors via confined-solvent vapor annealing to optimize their microstructure, with the final goal being to enhance their emission properties. Our results have demonstrated enlargements in photoluminescence intensity of up to 270%, 258% and 240% when thin films of polyfluorenes of average molecular weights of 105,491 g/mol, 63,114 g/mol and 14,000 g/mol, respectively, experienced increases in their β-phase fractions upon processing.

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Regulation of microstructure and charge transport properties of cyclopentadiene-based conjugated polymers via side-chain engineering

Abstract: A series of copolymers of cyclopentadiene and DPP unit with different side chains were synthesized. The copolymer with longer linear alkyl spacer and shorter branches exhibited superior performance and the highest mobility up to 2.1 cm2 V−1 s−1.

Cited by 3 publications

References 56 publications

Synthesis of Conjugated Polymers: Comparing the Indophenine Reaction with Traditional Methods

Synthesis of Conjugated Polymers: Comparing the Indophenine Reaction with Traditional Methods

Modulating Aggregation Behavior by Ternary Strategies for Efficient and Stable Thick‐Film Organic Solar Cells

Large Enhancement of Photoluminescence Obtained in Thin Polyfluorene Films of Optimized Microstructure

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