1,5-Diiodocycloctane: a cyclane solvent additive that can extend the exciton diffusion length in thick film organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(5), С. 1916 - 1930

Опубликована: Янв. 1, 2024

The addition of cyclane 1,5-diiodocycloctane (DICO) provides critical roles in extending exciton diffusion length within active layer, consequently contributing to the improvement power conversion. efficiency thick film organic solar cells.

Язык: Английский

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Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2% Efficiency Ortho-Xylene Processed Organic Solar Cells

Nano-Micro Letters, Год журнала: 2023, Номер 16(1)

Опубликована: Ноя. 23, 2023

Abstract With plenty of popular and effective ternary organic solar cells (OSCs) construction strategies proposed applied, its power conversion efficiencies (PCEs) have come to a new level over 19% in single-junction devices. However, previous studies are heavily based chloroform (CF) leaving behind substantial knowledge deficiencies understanding the influence solvent choice when introducing third component. Herein, we present case where newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy, named BTP-BO-3FO with enlarged bandgap, brings different morphological evolution performance improvement effect on host system PM6:BTP-eC9, processed by CF ortho-xylene ( o -XY). detailed analyses supported series experiments, best PCE 19.24% for green solvent-processed OSCs is found be fruit finely tuned crystalline ordering general aggregation motif, which furthermore nourishes favorable charge generation recombination behavior. Likewise, can achieved replacing spin-coating blade coating active layer deposition. This work focuses commonly met yet frequently ignored issues building blends demonstrate cutting-edge device performance, hence, will instructive other OSC works future.

Язык: Английский

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Impact of Intermolecular Interactions between Halogenated Volatile Solid Additives and the Nonfullerene Acceptor in Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 33(50)

Опубликована: Сен. 5, 2023

Abstract The halogenated volatile solid additives can delicately optimize the active layer morphology of organic solar cells, improving devices' performance, stability, and reproducibility. However, what type intermolecular interaction occurs between whether truly impacts donor or acceptor remains debatable. Herein, focus is on with conjugated benzene rings their influence composed PM6:Y6 as they evaporated. absorbance spectra exhibit apparent red‐shift features in Y6 absorption regions, while part unaffected. theoretical calculation results reveal that stay two molecules form halogen bonds, affecting π–π aggregation properties Y6. As a result, crystalline are altered, leading to increased charge carrier mobilities, extended diffusion lengths, reduced bimolecular recombination, thus device performance. Especially when 1,3,5‐tri bromobenzene used, champion power conversion efficiency 17.9% attained, among best‐performed cells comprising PM6:Y6. findings shed light experimental guidelines for designing developing highly efficient nonfullerene cells.

Язык: Английский

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Solid Additive‐Assisted Selective Optimization Strategy for Sequential Deposited Active Layers to Construct 19.16% Efficiency Binary Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 34(13)

Опубликована: Дек. 21, 2023

Abstract Volatile solid (VS)‐additives are regarded as an effective tool to manipulate morphology of sequential deposited (SD) active layers for improving power conversion efficiencies (PCEs) organic solar cells (OSCs), while the independent effect VS‐additives on donor and acceptor is often overlooked. Herein, a new VS‐additive named 2‐(2‐methoxyphenyl)benzo[ b ]thiophene (BTO) synthesized applied in SD binary PM6/L8‐BO layers. Introducing it into bottom PM6 layer (PM6 + ), BTO has low volatility longer volatilization distance, which prolongs interaction time between L8‐BO /L8‐BO film, leading over‐aggregated L8‐BO. While inserting top (L8‐BO fast evaporation excellent dipole help enhance molecular absorption, crystallinity, ordered packing system. Therefore, optimized with proper phase separation achieved increase exciton dissociation charge transfer properties, restrain recombination energy loss OSCs, yielding impressive PCE over 19%. Furtherly, using D18 instead PM6, SD‐systems offer record‐high 19.16%. The developed selective optimization strategy provides deep insight working mechanism boosting OSCs.

Язык: Английский

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Designing a Novel Wide Bandgap Small Molecule Guest for Enhanced Stability and Morphology Mediation in Ternary Organic Solar Cells with over 19.3% Efficiency

Advanced Science, Год журнала: 2024, Номер 11(23)

Опубликована: Апрель 3, 2024

Abstract In this study, a novel wide‐bandgap small molecule guest material, ITOA, designed and synthesized for fabricating efficient ternary organic solar cells (OSCs) ITOA complements the absorbance of PM6:Y6 binary system, exhibiting strong crystallinity modest miscibility. optimizes morphology by promoting intensive molecular packing, reducing domain size, establishing preferred vertical phase distribution. These features contribute to improved well‐balanced charge transport, suppressed carrier recombination, exciton dissociation. Consequently, significantly enhanced efficiency 18.62% device is achieved, accompanied increased short‐circuit current density ( J SC ), fill factor (FF), open‐circuit voltage V OC ). Building on success, replacing Y6 with BTP‐eC9 leads an outstanding PCE 19.33% OSCs. Notably, introduction expedites formation optimized morphology, resulting in impressive 18.04% without any postprocessing. Moreover, exhibits operational stability under maximum power point (MPP) tracking. This comprehensive study demonstrates that rationally can optimize reduce energy loss, streamline fabrication process, essential achieving high OSCs, paving way practical commercial applications.

Язык: Английский

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Ameliorated trap density and energetic disorder via a strengthened intermolecular interaction strategy to construct efficient non-halogenated organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(15), С. 5542 - 5551

Опубликована: Янв. 1, 2024

The efficiency of non-halogenated organic solar cells is improved from 17.1% to 19.4% after dibenzyl ether (DBE) additive treatment. More strikingly, the thick-film devices achieved a champion 17.4%.

Язык: Английский

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Achieving 20% Efficiency in Organic Solar Cells Through Conformationally Locked Solid Additives

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 3, 2025

Abstract Volatile solid additives (VSAs) have emerged as one of the most effective strategies for optimizing active layer morphology organic solar cells (OSCs). In this study, two VSAs, HBT‐1 and HBT‐2, are designed synthesized to investigate effect VASs’ conformation on photovoltaic performances. Compared HBT‐1, HBT‐2 incorporates internal noncovalent conformational locks (NoCLs), resulting in reduced disorder, improved molecular planarity, enhanced crystallinity. These features significantly influence intermolecular packing both donor acceptor materials layer, which can facilitate charge transport reduce recombination. Consequently, D18:L8‐BO:PY‐C11 OSCs utilizing additive achieved an impressive efficiency 20.01%, markedly higher than devices fabricated without (17.83%) those processed with (18.76%). Furthermore, demonstrated excellent compatibility across multiple systems. This work underscores NoCL strategy a straightforward approach designing VSAs high performance OSCs.

Язык: Английский

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Low‐Volatility Fused‐Ring Solid Additive Engineering for Synergistically Elongating Exciton Lifetime and Mitigating Trap Density Toward Organic Solar Cells of 20.5% Efficiency

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 12, 2025

Abstract Volatile solid additives (VSAs) with single or fused‐ring structures have attracted much attention for enhancing power conversion efficiencies (PCEs) of organic solar cells (OSCs). While the working mechanisms high‐volatility single‐ring been well studied, influence low‐volatility VSAs on molecular aggregations and exciton/carrier dynamics remains still unclear. Herein, 3,6‐dibromothieno[3,2‐b]thiophene (3,6TTBr) is selected as a representative VSA to elucidate its mechanism. Via theoretical experimental joint investigation, it found that rigid planar 3,6TTBr molecules adsorb onto terminal units L8‐BO (acceptor), inducing loose space adjacent molecules. The thus favors center‐terminal packing larger interfragment distance, which relieves over‐aggregation induces ordered packing. Consequently, treatment reduces aggregation‐caused quenching, photoluminescence quantum yield exciton lifetime film. combination above properties reduced trap density improved carrier transport in 3,6TTBr‐treated devices contributed PCE 20.1%. To validate broad applicability findings, 1,5‐dibromonaphthalene (1,5‐BN), another solid, explored. 1,5‐BN achieved an impressive 20.5%, verifying validity strategy boosting OSC performances.

Язык: Английский

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Precise Methylation Yields Acceptor with Hydrogen‐Bonding Network for High‐Efficiency and Thermally Stable Polymer Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 63(6)

Опубликована: Дек. 15, 2023

Abstract Utilizing intermolecular hydrogen‐bonding interactions stands for an effective approach in advancing the efficiency and stability of small‐molecule acceptors (SMAs) polymer solar cells. Herein, we synthesized three SMAs (Qo1, Qo2, Qo3) using indeno[1,2‐ b ]quinoxalin‐11‐one (Qox) as electron‐deficient group, with incorporation a methylation strategy. Through crystallographic analysis, it is observed that two Qox‐based methylated (Qo2 exhibit multiple hydrogen bond‐assisted 3D network transport structures, contrast to 2D structure gem‐dichlorinated counterpart (Qo4). Notably, Qo2 exhibits stronger compared Qo3. Consequently, PM6 : device realizes highest power conversion (PCE) 18.4 %, surpassing efficiencies devices based on Qo1 (15.8 %), Qo3 (16.7 Qo4 (2.4 %). This remarkable PCE can be primarily ascribed enhanced donor‐acceptor miscibility, more favorable medium structure, efficient charge transfer collection behavior. Moreover, demonstrates exceptional thermal stability, retaining 82.8 % its initial after undergoing annealing at 65 °C 250 hours. Our research showcases precise methylation, particularly targeting formation tune crystal packing patterns, represents promising strategy molecular design stable SMAs.

Язык: Английский

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Developing Efficient Benzene Additives for 19.43% Efficiency of Organic Solar Cells by Crossbreeding Effect of Fluorination and Bromination

Advanced Functional Materials, Год журнала: 2023, Номер 34(8)

Опубликована: Ноя. 12, 2023

Abstract Employing volatile solid additives have emerged as a promising method to optimize the morphology and improve performance of organic solar cells (OSCs). However, principles governing efficient design remain elusive. Herein, programmed fluorination and/or bromination on benzene core develop for OSCs is reported. The endow five halogen derivatives, 1,3,5‐trifluorobenzene, hexafluorobenzene, 1,3,5‐tribromo‐2,4,6‐trifluorobenzene (TFTB), 1,3,5‐tribromobenzene, hexabromobenzene, with different melting boiling points, volatility, well interactions host blend. Studies indicate that extremely high low volatility are almost powerless even detrimental evolution. Among them, combination fluorine bromine atoms TFTB not only enables more appropriate m.p./b.p. but also exerts stronger molecular blend, giving rise higher ordered packing favorable morphology. Importantly, exhibits good universality performances power conversion efficiencies (PCEs; over 18%) in group binary blend systems, an impressive PCE 19.43% ternary PBTz‐F:PM6:L8‐BO system.

Язык: Английский

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