Heterogeneous Nucleating Agent for High‐Boiling‐Point Nonhalogenated Solvent‐Processed Organic Solar Cells and Modules

Advanced Materials, Год журнала: 2024, Номер 36(27)

Опубликована: Март 30, 2024

Abstract High‐boiling‐point nonhalogenated solvents are superior to produce large‐area organic solar cells (OSCs) in industry because of their wide processing window and low toxicity; while, these with slow evaporation kinetics will lead excessive aggregation state‐of‐the‐art small molecule acceptors (e.g. L8‐BO), delivering serious efficiency losses. Here, a heterogeneous nucleating agent strategy is developed by grafting oligo (ethylene glycol) side‐chains on L8‐BO (BTO‐BO). The formation energy the obtained BTO‐BO; changing from liquid solvent crystalline phase, lower than that irrespective type. When BTO‐BO added as third component into active layer PM6:L8‐BO), it easily assembles form numerous seed crystals, which serve nucleation sites trigger increase density through strong hydrogen bonding interactions even high‐boiling‐point solvents. Therefore, can effectively suppress during growth, achieving ideal phase‐separation domain sizes high crystallinity. resultant toluene‐processed OSCs exhibit record power conversion (PCE) 19.42% (certificated 19.12%) excellent operational stability. also has advantages large‐scale devices, showing 15.03‐cm 2 module PCE 16.35% 15.97%).

Язык: Английский

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Defining Solid Additive's Pivotal Role on Morphology Regulation in Organic Solar Cells Produced by Layer‐by‐layer Deposition

Advanced Energy Materials, Год журнала: 2024, Номер 14(22)

Опубликована: Март 8, 2024

Abstract Herein, two emerging device optimization methods, solid additive and layer‐by‐layer (LBL) process, for organic solar cells (OSCs) are simultaneously studied. Through traditional blend cast recently proposed identical solvent LBL cast, BDCB (2‐monobromo‐1,3‐dichloro‐bezene), a benzene derivative, is used to improve the performance based on celebrity combination PM6:L8‐BO. The results reveal that finely optimized concentration in PM6 solution can push efficiency of 19.03% compared with only 18.12% while power conversion (PCE) changing trend determined by BDCB's ratio L8‐BO's precursor. morphology characterizations confirm there exists no significant stratification LBL‐processed devices, supported previously reported swelling‐intercalation‐phase separation (SIPS) model. Thereby, additive's 2D considered smart strategy tuning SIPS which various final states. This work not reports cutting‐edge binary OSCs, but also new insight deep understanding method‐based development.

Язык: Английский

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

Advanced Materials, Год журнала: 2024, Номер 36(33)

Опубликована: Июнь 19, 2024

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

Язык: Английский

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Regulation of molecular orientation in organic solar cells

Chemical Engineering Journal, Год журнала: 2024, Номер 488, С. 150783 - 150783

Опубликована: Март 28, 2024

Язык: Английский

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Approaching 20% Efficiency in Ortho‐Xylene Processed Organic Solar Cells by a Benzo[a]phenazine‐Core‐Based 3D Network Acceptor with Large Electronic Coupling and Long Exciton Diffusion Length

Advanced Materials, Год журнала: 2024, Номер 36(41)

Опубликована: Авг. 13, 2024

Abstract High‐performance organic solar cells often rely on halogen‐containing solvents, which restrict the photovoltaic industry. Therefore, it is imperative to develop efficient materials compatible with halogen‐free solvents. Herein, a series of benzo[ ]phenazine (BP)‐core‐based small‐molecule acceptors (SMAs) achieved through an isomerization chlorination strategy presented, comprising unchlorinated NA1, 10‐chlorine substituted NA2, 8‐chlorine NA3, and 7‐chlorine NA4. Theoretical simulations highlight NA3's superior orbit overlap length tight molecular packing, attributed interactions between end group BP unit. Furthermore, NA3 demonstrates dense 3D network structures record electronic coupling 104.5 meV. These characteristics empower ortho‐xylene ( o ‐XY) processed PM6:NA3 device power conversion efficiency (PCE) 18.94%, surpassing PM6:NA1 (15.34%), PM6:NA2 (7.18%), PM6:NA4 (16.02%). Notably, significantly lower PCE in excessive self‐aggregation NA2 ‐XY. Importantly, incorporation D18‐Cl into binary blend enhances crystallographic ordering increases exciton diffusion donor phase, resulting ternary 19.75% (certified as 19.39%). findings underscore significance incorporating new electron‐deficient units design SMAs tailored for environmentally benign solvent processing OSCs.

Язык: Английский

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Molecular Precision Engineering for Efficient Binary Organic Photovoltaics through Energy Level and Fibrillar Structure Modulation

Advanced Energy Materials, Год журнала: 2024, Номер 14(33)

Опубликована: Май 30, 2024

Abstract Adjusting the energy levels and fibrillar morphology is paramount to enhancing power conversion efficiency (PCE) of organic solar cells (OSCs). In present study, an increase in open‐circuit voltage ( V OC ) facilitated through elongation alkyl chain within AQx (namely AQx‐8), aiming decrease free volume ratio (FVR). This reduction FVR attenuates electron‐phonon coupling, thereby augmenting emission diminishing non‐radiative loss (Δ E nr ). To further refine morphological characteristics, external undecyl AQx‐8 substituted with a shorter carbon cyclohexane noted for its considerable steric hindrance (AQx‐H). alteration significantly mitigates intermolecular aggregation, expands bandgap, elevates lowest unoccupied molecular orbital (LUMO) level, culminating elevated 0.923 devices based on AQx‐H. Morphological analysis reveals that blends AQx‐H exhibit enhanced multi‐length‐scale structure, which conducive exciton dissociation charge transport, contributing high fill factor (FF) nearing 80%. Consequently, this study reports one highest binary PCEs documented, standing at 19.5% (with certification 19.0%).

Язык: Английский

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Dynamic hydrogen-bonding enables high-performance and mechanically robust organic solar cells processed with non-halogenated solvent

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Янв. 17, 2025

Developing active-layer systems with both high performance and mechanical robustness is a crucial step towards achieving future commercialization of flexible stretchable organic solar cells (OSCs). Herein, we design synthesize series acceptors BTA-C6, BTA-E3, BTA-E6, BTA-E9, featuring the side chains hexyl, 3, 6, 9 carbon-chain ethyl ester end groups respectively. Benefiting from suitable phase separation vertical distribution, PM6:BTA-E3-based OSCs processed by o-xylene exhibit lower energy loss improved charge transport characteristic achieve power conversion efficiency 19.92% (certified 19.57%), which stands as highest recorded value in binary green solvents. Moreover, due to additional hydrogen-bonding provided chain, enhanced stretchability thermal stability. Our work reveals significance dynamic improving photovoltaic performance, robustness, morphological stability OSCs.

Язык: Английский

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Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

Energy & Environmental Science, Год журнала: 2024, Номер 17(14), С. 4944 - 4967

Опубликована: Янв. 1, 2024

Quinoxaline-based nonfullerene acceptors show highly tunable photoelectric properties and superior performance for sunlight utilization enabled by their powerful core-functionalization ability.

Язык: Английский

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Synergistic Catalysis of Cobalt Single Atoms and Clusters Loaded on Carbon Film: Enhancing Peroxymonosulfate Activation for Degradation of Norfloxacin

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 1, 2024

Abstract Many existing research focuses on the differences or performance comparisons between single‐atom small‐sized nanocluster catalysts, but there is a lack of comprehensive coupling relationship structure and activity mechanism synergy. This study investigates combined catalytic potential cobalt single atoms (SAs) nanoclusters (NCs) for enhanced peroxymonosulfate (PMS) activation to degrade norfloxacin (NFX). A novel Co SAs‐NCs /CN/TiO 2 catalyst synthesized, featuring SAs NCs uniformly dispersed carbon film wrapping TiO , degradation efficiency NFX solution almost completely degraded, with mineralization rate 76.35%. Density functional theory (DFT) calculations indicate that synergistic interaction promotes more efficient PMS adsorption significantly reduces energy barrier, which enhances electron transfer increases reactive oxygen species (ROS) generation. highlights robust versatile nature this system in addressing various contaminants. elucidates providing new ideas advanced oxidation processes (AOPs) environmental remediation, linking emphasizes practicality importance effectively long‐term remediation water pollutants.

Язык: Английский

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Solution Sequential Deposition Pseudo‐Planar Heterojunction: An Efficient Strategy for State‐of‐Art Organic Solar Cells

Small Methods, Год журнала: 2024, Номер unknown

Опубликована: Фев. 22, 2024

Abstract Organic solar cells (OSCs) are considered as a promising new generation of clean energy. Bulk heterojunction (BHJ) structure has been widely employed in the active layer efficient OSCs. However, precise regulation morphology BHJ is still challenging due to competitive coupling between crystallization and phase separation. Recently, novel pseudo‐planar (PPHJ) structure, prepared through solution sequential deposition, attracted much attention. It an easy‐to‐prepare which separation structures, interfaces, molecular packing can be separately controlled. Employing PPHJ properties OSCs, such power conversion efficiency, stability, transparency, flexibility, so on, usually better than its counterpart. Hence, comprehensive understanding film‐forming process, control, device performance should considered. In terms representative works about PPHJ, this review first introduces fabrication process layers based on structure. Second, applied control methods summarized. Then, influences other property reviewed, largely expand application. Finally, brief prospect development tendency devices discussed with consideration their challenges.

Язык: Английский

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