Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(12), P. 5944 - 5955
Published: Jan. 1, 2023
It revealed the packing arrangement of three representative chlorinated NFAs, showing differences from linear to compact 3D network structures, which suggests evolution direction NFA materials with gradually enhanced device performance.
Language: Английский
Advanced Materials, Journal Year: 2023, Volume and Issue: 35(17)
Published: Feb. 3, 2023
Suppressing the photon energy loss (Eloss ), especially non-radiative loss, is of importance to further improve device performance organic solar cells (OSCs). However, typical π-conjugated semiconductors possess a large singlet-triplet gap (ΔEST leading lower triplet state than charge transfer and contributing channel photocurrent by state. Herein, series polymer donors are developed introducing BNIDT block into PM6 backbone. The high electron affinity opposite resonance effect BN bond in results lowered highest occupied molecular orbital (HOMO) largely reduced ΔEST . Moreover, morphology active blends also optimized fine-tuning content. Therefore, recombination via terminal channels traps effectively suppressed. PNB-3 (with 3% BNIDT):L8-BO exhibits both small morphology, favoring more efficient transport. Finally, simultaneously enhanced Voc 0.907 V, Jsc 26.59 mA cm-2 , FF 78.86% contribute champion PCE 19.02%. bonds benchmark polymers possible avenue toward higher-performance OSCs.
Language: Английский
Citations
55
Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(8), P. 3543 - 3551
Published: Jan. 1, 2023
Qx- p -4Cl with both a para -fluorinated central unit and chlorinated end groups exhibits enhanced molecular packing, facilitating efficient charge transport, thus achieving power conversion efficiency (PCE) of 18.78% when blended donor PM6.
Language: Английский
Citations
46
Advanced Materials, Journal Year: 2023, Volume and Issue: 35(48)
Published: July 29, 2023
Power conversion efficiency (PCE) of organic solar cells (OSCs) processed by nonhalogenated solvents is unsatisfactory due to the unfavorable morphology. Herein, two new small molecule acceptors (SMAs) Y6-Ph and L8-Ph are synthesized introducing a phenyl end group in inner side chains SMAs Y6 L8-BO, respectively, for overcoming excessive aggregation long-time film forming solvents. First, effect time on property photovoltaic performance Y6, Y6-Ph, studied using commonly used solvents: chloroform (CF) (rapid process) chlorobenzene (CB) (slow process). It found that Y6- L8-BO-based OSCs exhibit dramatic drop PCE from CF- CB-processed devices owing large phase separation, while based show obviously increased PCEs Furthermore, L8-Ph-based solvent o-xylene (o-XY) achieved high 18.40% with an FF 80.11%. The results indicate effective strategy modulate morphology improve
Language: Английский
Citations
46
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(15)
Published: Feb. 8, 2024
Fluorine side chain functionalization of non-fullerene acceptors (NFAs) represents an effective strategy for enhancing the performance organic solar cells (OSCs). However, a knowledge gap persists regarding relationship between structural changes induced by fluorine and resultant impact on device performance. In this work, varying amounts atoms were introduced into outer chains Y-series NFAs to construct two named BTP-F0 BTP-F5. Theoretical experimental investigations reveal that side-chain fluorination significantly increase overall average electrostatic potential (ESP) charge balance factor, thereby effectively improving ESP-induced intermolecular interaction, thus precisely tuning molecular packing bulk-heterojunction morphology. Therefore, BTP-F5-based OSC exhibited enhanced crystallinity, domain purity, reduced spacing, optimized phase distribution in vertical direction. This facilitates exciton diffusion, suppresses recombination, improves extraction. Consequently, promising power conversion efficiency (PCE) 17.3 % 19.2 achieved binary ternary devices, respectively, surpassing PCE 16.1 BTP-F0-based OSCs. work establishes structure-performance demonstrates is compelling achieving ideal separation highly efficient
Language: Английский
Citations
46
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: Sept. 1, 2024
Self-assembled monolayers (SAMs) have become pivotal in achieving high-performance perovskite solar cells (PSCs) and organic (OSCs) by significantly minimizing interfacial energy losses. In this study, we propose a co-adsorb (CA) strategy employing novel small molecule, 2-chloro-5-(trifluoromethyl)isonicotinic acid (PyCA-3F), introducing at the buried interface between 2PACz perovskite/organic layers. This approach effectively diminishes 2PACz's aggregation, enhancing surface smoothness increasing work function for modified SAM layer, thereby providing flattened with favorable heterointerface perovskite. The resultant improvements crystallinity, minimized trap states, augmented hole extraction transfer capabilities propelled power conversion efficiencies (PCEs) beyond 25% PSCs p-i-n structure (certified 24.68%). OSCs CA achieve remarkable PCEs of 19.51% based on PM1:PTQ10:m-BTP-PhC6 photoactive system. Notably, universal also been achieved other two popular OSC systems. After 1000-hour maximal point tracking, encapsulated retain approximately 90% 80% their initial PCEs, respectively. introduces facile, rational, effective method to enhance performance SAMs, realizing efficiency breakthroughs both device structure, along improved operational stability. are essential high Here, authors develop molecule provide heterointerface, devices.
Language: Английский
Citations
44
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(27)
Published: March 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%).
Language: Английский
Citations
39
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 488, P. 150783 - 150783
Published: March 28, 2024
Language: Английский
Citations
28
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)
Published: Aug. 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.
Language: Английский
Citations
28
Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(17)
Published: Feb. 8, 2024
Abstract The conjugated small‐molecule materials of organic solar cells have always played a crucial role in light‐harvesting, charge transport, morphology optimization, and the attainment efficient devices. advancement novel understanding underlying molecular design rules serve as driving force for furthering stable photovoltaic Among variety principles, symmetry‐breaking strategy, which is well developed 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d’]‐s‐indaceno[1,2‐b:5,6‐b’]dithiophene (ITIC)‐series acceptors, recently demonstrates great potential acceptors donors realizing high power conversion efficiency. In this review, order to give deep insight on asymmetric are systematically summarized with structure elucidate structure‐performance relationship, packing behaviors, evolution. Not only delicate balance between open circuit voltage short‐circuit current density, but also reductions recombination non‐radiative considered play key points improving performance when molecule used host or guest materials. Finally, concise challenges outlooks provided future development application molecules strategies.
Language: Английский
Citations
17
Nature Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 29, 2025
Language: Английский
Citations
6