The central core size effect in quinoxaline-based non-fullerene acceptors for high <i>V</i><sub>OC</sub> organic solar cells

Ran, Xinya; Shi, Yanan; Qiu, Dingding; Zhang, Jianqi; Lu, Kun; Wei, Zhixiang

doi:10.1039/d3nr05077g

Cited by 5 publications

(1 citation statement)

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“…Inspired by the successful design of L8-BO, we have recently reported three Qx-based acceptors, Qx-BO-1, Qx-BO-2, and Qx-BO-3, containing 2-butyloctyl side chains at the β-positions of the outer thiophene units. 53 The introduction of branched alkyl chains enables high V OC values of over 0.95 V with a low E loss of around 0.50 eV for OSCs based on PM6:Qx-BO-1 and PM6:Qx-BO-2. However, their large central units and branched alkyl chains exhibit undesirable steric hindrance, resulting in inferior film morphology, which affects charge generation/transport and the resulting PCE (<12%).…”

Section: The Development Of Qx-based Acceptorsmentioning

confidence: 99%

Quinoxaline-based Y-type acceptors for organic solar cells

Xie,

Wei,

2024

Chem. Sci.

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Section: The Development Of Qx-based Acceptorsmentioning

confidence: 99%

Quinoxaline-based Y-type acceptors for organic solar cells

Xie,

Wei,

2024

Chem. Sci.

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The Development of Quinoxaline‐Based Electron Acceptors for High Performance Organic Solar Cells

Liu,

Geng,

Xiao

et al. 2024

Advanced Materials

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In the recent advances of organic solar cells (OSCs), quinoxaline (Qx)‐based nonfullerene acceptors (QxNFAs) have attracted lots of attention and enabled the recorded power conversion efficiency approaching 20%. As an excellent electron‐withdrawing unit, Qx possesses advantages of many modifiable sites, wide absorption range, low reorganization energy, and so on. To develop promising QxNFAs to further enhance the photovoltaic performance of OSCs, it is necessary to systematically summarize the QxNFAs reported so far. In this review, all the focused QxNFAs are classified into five categories as following: SM‐Qx, YQx, fused‐YQx, giant‐YQx, and polymer‐Qx according to the molecular skeletons. The molecular design concepts, relationships between the molecular structure and optoelectronic properties, intrinsic mechanisms of device performance are discussed in detail. At the end, the advantages of this kind of materials are summed up, the molecular develop direction is prospected, the challenges faced by QxNFAs are given, and constructive solutions to the existing problems are advised. Overall, this review presents unique viewpoints to conquer the challenge of QxNFAs and thus boost OSCs development further toward commercial applications.

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Efficient and Stable Organic Solar Cells Achieved by Synergistic Optimization of Extended End‐Capped Groups and Fluorinated Quinoxaline Central Cores in Nonfullerene Acceptors

Zhang,

Shi,

Tao

et al. 2024

Advanced Energy Materials

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Molecular stacking behavior exerts a significant influence on the blend film morphology of organic solar cells (OSCs), further affecting device performance and stability. Modulation of the molecular structure, such as central unit and end‐group, can profoundly impact this process. Herein, four quinoxaline (Qx)‐fused‐core‐based non‐fullerene acceptors (NFAs), Qx‐N4F and Qx‐o/m/p‐N4F are synthesized combining π‐extended end‐groups and optimized central units. The isomeric fluorinated central units lead to changes in the local dipole moments and electrostatic potential distribution, which influences the molecular stacking pattern and photoelectronic properties of NFAs. Consequently, binary and ternary devices based on PM6:Qx‐p‐N4F achieve superior power conversion efficiencies (PCE) of up to 18.75% and 19.48%, respectively. Grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) characterization reveals Qx‐p‐N4F's stronger crystallinity, aggregation, and donor–acceptor interactions, which can separately enhance short‐circuit current density (JSC) and fill factor (FF) through higher phase purity and tighter molecular stacking based on maintaining more donor–acceptor interfaces. Furthermore, PM6:Qx‐p‐N4F‐based devices demonstrate exceptional thermal stability, retaining 93.2% of the initial PCE value after 3000 h of heating due to the best morphological stability with the most stable stacking structure. These results underscore the significance of synergistic optimization of NFAs through conjugation expansion and halogenation substitution for obtaining efficient and stable OSCs.

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The central core size effect in quinoxaline-based non-fullerene acceptors for high V_OC organic solar cells

Abstract: For organic solar cells(OSCs), obtaining high open circuit voltage (VOC) is often accompanied by the sacrifice of circuit current density (JSC)and filling factor (FF), it is difficult to strike a...

Cited by 5 publications

References 62 publications

Quinoxaline-based Y-type acceptors for organic solar cells

Quinoxaline-based Y-type acceptors for organic solar cells

The Development of Quinoxaline‐Based Electron Acceptors for High Performance Organic Solar Cells

Efficient and Stable Organic Solar Cells Achieved by Synergistic Optimization of Extended End‐Capped Groups and Fluorinated Quinoxaline Central Cores in Nonfullerene Acceptors

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The central core size effect in quinoxaline-based non-fullerene acceptors for high VOC organic solar cells

Abstract: For organic solar cells(OSCs), obtaining high open circuit voltage (VOC) is often accompanied by the sacrifice of circuit current density (JSC)and filling factor (FF), it is difficult to strike a...

Cited by 5 publications

References 62 publications

Quinoxaline-based Y-type acceptors for organic solar cells

Quinoxaline-based Y-type acceptors for organic solar cells

The Development of Quinoxaline‐Based Electron Acceptors for High Performance Organic Solar Cells

Efficient and Stable Organic Solar Cells Achieved by Synergistic Optimization of Extended End‐Capped Groups and Fluorinated Quinoxaline Central Cores in Nonfullerene Acceptors

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The central core size effect in quinoxaline-based non-fullerene acceptors for high V_OC organic solar cells