Recent Progress of Y6‐Derived Asymmetric Fused Ring Electron Acceptors

Advanced Functional Materials, Год журнала: 2022, Номер 32(35)

Опубликована: Июль 5, 2022

Abstract Symmetric conjugated molecules can be broken through suitable synthetic strategies to construct novel asymmetric molecules, which largely broaden the material library. In field of organic solar cells, fused‐ring electron acceptors (FREAs) with A‐DA'D‐A type backbone structure have attracted much attention and enabled power conversion efficiencies (PCE) exceeding 18%. Among them, Y6 is one most classic FREAs that derive many symmetric exhibit unique optoelectronic properties. Thus, in this review, focus on recent progress Y6‐derived containing a dipyrrolobenzothiadiazole segment, classified as following three categories: end group, central core side chain. The relationship molecular structure, properties, device performance discussed detail. Finally, future design directions challenges faced by kind photovoltaic materials are given.

Язык: Английский

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Enhancing Photon Utilization Efficiency for High‐Performance Organic Photovoltaic Cells via Regulating Phase‐Transition Kinetics

Advanced Materials, Год журнала: 2023, Номер 35(16)

Опубликована: Янв. 30, 2023

Efficient photon utilization is key to achieving high-performance organic photovoltaic (OPV) cells. In this study, a multiscale fibril network morphology in PBQx-TCl:PBDB-TF:eC9-2Cl-based system constructed by regulating donor and acceptor phase-transition kinetics. The distinctive process crystal size are systematically investigated. PBQx-TCl eC9-2Cl form structures with diameters of ≈25 nm ternary films. Additionally, fine fibrils assembled PBDB-TF uniformly distributed over the networks eC9-2Cl. ideal enables achieve superior charge transfer transport processes compared binary systems; these improvements promote enhanced efficiency. Finally, high power conversion efficiency 19.51% single-junction OPV cell achieved. external quantum optimized exceeds 85% wide range 500-800 nm. A tandem also fabricated increase solar absorption. has an excellent PCE more than 20%. This study provides guidance for constructing improving

Язык: Английский

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Revealing the underlying solvent effect on film morphology in high-efficiency organic solar cells through combinedex situandin situobservations

Energy & Environmental Science, Год журнала: 2023, Номер 16(5), С. 2316 - 2326

Опубликована: Янв. 1, 2023

Here the aggregation behavior differences induced by solvent–material and material–material interactions are clearly revealed combined ex situ in morphology characterization studies on representative high-efficiency OPV systems.

Язык: Английский

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Achieving Desired Pseudo‐Planar Heterojunction Organic Solar Cells via Binary‐Dilution Strategy

Advanced Materials, Год журнала: 2023, Номер 36(3)

Опубликована: Окт. 13, 2023

The sequential deposition process has demonstrated the great possibility to achieve a photolayer architecture with an ideal gradient phase separation morphology, which vital influence on physical processes that determine performance of organic solar cells (OSCs). However, controllable preparation pseudo-planar heterojunction (P-PHJ) distribution not been effectively elucidated. Herein, binary-dilution strategy is proposed, PM6 solution micro acceptor BO-4Cl and L8-BO donor respectively, form P-PHJ film. This exists good (D) (A) vertical larger D/A interpenetrating regions, promotes exciton generation dissociation, shortens charge transport distance optimizes carrier dynamics. Moreover, dilution by regulation active layer aggregation size purity, thus alleviating energy disorder voltage loss. As result, device exhibits outstanding power conversion efficiency 19.32% excellent short-circuit current density 26.92 mA cm

Язык: Английский

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A high-efficiency and stable organic solar cell with balanced crystallization kinetics

Energy & Environmental Science, Год журнала: 2024, Номер 17(6), С. 2182 - 2192

Опубликована: Янв. 1, 2024

In this work, we present a conceptual strategy based on multi-acceptor components to realize balanced crystallization kinetics in organic solar cells (OSC) that deliver 19.35% power conversion efficiency with superior photostability.

Язык: Английский

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Rapid solidification for green-solvent-processed large-area organic solar modules with >16% efficiency

Energy & Environmental Science, Год журнала: 2024, Номер 17(8), С. 2935 - 2944

Опубликована: Янв. 1, 2024

A rapid solidification strategy was developed for simultaneously avoiding the Marangoni effect and suppressing molecular aggregation. The resultant 15.64 cm 2 large-area OSC module exhibited a record power conversion efficiency of 16.03%.

Язык: Английский

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Completely Non‐Fused Low‐Cost Acceptor Enables Organic Photovoltaic Cells with 17 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(22)

Опубликована: Март 25, 2024

Abstract To meet the industrial requirements of organic photovoltaic (OPV) cells, it is imperative to accelerate development cost‐effective materials. Thiophene‐benzene‐thiophene central unit‐based acceptors possess advantage low synthetic cost, while their power conversion efficiency (PCE) relatively low. Here, by incorporating a para ‐substituted benzene unit and 1 st ‐position branched alkoxy chains with large steric hindrance, completely non‐fused non‐fullerene acceptor, TBT‐26, was designed synthesized. The narrow band gap 1.38 eV ensures effective utilization sunlight. favorable phase separation morphology TBT‐26‐based blend film facilitates efficient exciton dissociation charge transport in corresponding OPV cell. Therefore, small‐area cell achieves an impressive PCE 17.0 %, which highest value cells. Additionally, we successfully demonstrated scalability this design fabricating 28.8 cm 2 module high 14.3 %. Overall, our work provides practical molecular strategy for developing high‐performance low‐cost acceptors, paving way applications technology.

Язык: Английский

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A Pseudo Planar Heterojunction Structure for Eco‐Friendly Printable Organic Solar Cells Achieving 19.05% Efficiency

Advanced Functional Materials, Год журнала: 2024, Номер 34(38)

Опубликована: Апрель 27, 2024

Abstract Obtaining a well‐accurate vertical distribution active layer morphology through the air‐printing process is an essential task for achieving efficient scalable large‐area organic solar cells (OSCs). In this target, desired and controllable pseudo planar heterojunction (PPHJ) structure with suitable phase separation developed by pre‐deposited D18‐Cl under PM6:BTP‐eC9 film via eco‐friendly manufacturing method. The addition of regulates molecular crystallization leads to ideal stratification while simultaneously suppressing voltage loss, optimizing energetic disorder, carrier management. Impressively, optimal PPHJ devices perform superior power conversion efficiencies (PCEs) 19.05% (100 nm), 17.33% (300 14.14% (4 cm 2 ) compared BHJ devices. Importantly, OSCs also exhibit impressive extrapolated T 80 (the time required reach 80% initial PCE) long‐time storage operational stability, as well thermal stability.

Язык: Английский

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Tailoring Cyano Substitutions on Quinoxaline‐based Small‐Molecule Acceptors Enabling Enhanced Molecular Packing for High‐Performance Organic Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер 14(30)

Опубликована: Май 11, 2024

Abstract Cyanation is a common chemical modification strategy to fine‐tune the energy levels and molecular packing of organic semiconductors, especially materials used in solar cells (OSCs). Generally, cyanation modify end groups high‐performance small‐molecule acceptors (SMAs). However, has not been investigated on central backbone SMAs, which could introduce stronger intermolecular interaction enhance π–π stacking for rapid charge transport. This paper, first time, reports new benzo‐quinoxaline core synthesizes two novel A‐DA'D‐A type named BQx‐CN BQx‐2CN, with mono‐ di‐cyanide groups, respectively. Through tailoring number CN BQx‐CN‐based OSC exhibits best device performance 18.8%, significantly higher than non‐cyano BQx‐based one. The reason superior devices can be attributed fine‐tuned level, packing, ideal phase segregation, lead exciton dissociation, faster transport, suppressed recombination, therefore highest fill factor (FF) power conversion efficiencies (PCE). research demonstrates effectiveness SMAs enhanced better OSCs.

Язык: Английский

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Green Printing for Scalable Organic Photovoltaic Modules by Controlling the Gradient Marangoni Flow

Advanced Materials, Год журнала: 2024, Номер 36(21)

Опубликована: Фев. 10, 2024

Abstract Despite the rapid development in performances of organic solar cells (OSCs), high‐performance OSC modules based on green printing are still limited. The severe Coffee‐ring effect (CRE) is considered to be primary reason for nonuniform distribution active layer films. To solve this key problem, cosolvent strategy presented deposit guest solvent Mesitylene with a higher boiling point and lower surface tension incorporated into host o‐XY optimize rheological properties, such as viscosity solutions. And synergistic inward Marangoni flow generation solution thickening caused by can effectively restrain CRE, resulting highly homogeneous large‐area In addition, optimized crystallization phase separation films accelerate charge transport exciton dissociation devices. Consequently, PM6:BTP‐eC9 system, device prepared co‐solvent shows power conversion efficiency 17.80%. Moreover, effective area scales 1 16.94 cm 2 , recorded altered 16.71% 14.58%. This study provides universal pathway green‐printed high‐efficiency photovoltaics.

Язык: Английский

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