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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Strengthening the Hetero‐Molecular Interactions in Giant Dimeric Acceptors Enables Efficient Organic Solar Cells

Advanced Materials, Год журнала: 2023, Номер 36(4)

Опубликована: Ноя. 23, 2023

Abstract Giant dimeric acceptor (G‐Dimer) is becoming one of the most promising organic solar cell (OSC) materials because its definite structure, long‐term stability, and high efficiency. Strengthening hetero‐molecular interactions by monomer modification greatly influences morphology thus device performance, but lacks investigation. Herein, two novel quinoxaline core‐based G‐Dimers, Dimer‐QX Dimer‐2CF, are synthesized. By comparing trifluoromethyl‐substituted Dimer‐2CF non‐substituted Dimer‐QX, trifluoromethylation effect on G‐Dimer investigated revealed. The trifluoromethyl with strong electronegativity increases electrostatic potential reduces surface energy G‐Dimer, weakening homo‐molecular ordered packing reinforcing interaction donor. suppresses fast assembly during film formation, facilitating small domains molecular in blend, which a trade‐off conventional control. Together favorable vertical phase separation, efficient charge generation, reduced bimolecular recombination concurrently obtained. Hence, Dimer‐2CF‐based OSCs obtain cutting‐edge efficiency 19.02% fill factor surpassing 80%, an averaged extrapolated T 80 ≈12 000 h under continuous °C heating. This study emphasizes importance strategy, providing facile strategy for designing highly stable OSC materials.

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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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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Doping a Main-Chain Twisted Wide Bandgap Bifunctional Molecule Enables Efficient Ternary Organic Solar Cells

ACS Sustainable Chemistry & Engineering, Год журнала: 2025, Номер unknown

Опубликована: Янв. 9, 2025

The rapid development of organic solar cells (OSCs) has been particularly remarkable following the introduction high-performance small molecule electron acceptor Y6 and its derivatives. Despite advances in state-of-the-art OSCs, challenges remain, notably relatively low open circuit voltage (VOC) charge mobility imbalance, which continue to hinder further improvements OSCs' performance. To address these issues, this work, we synthesized a main-chain twisted wide bandgap i-IEDTB, not only possesses superior hole over but also higher lowest unoccupied molecular orbital (LUMO) energy levels, adopted it as bifunctional third compound couple with terpolymer Z10 based OSC system. integration i-IEDTB Z10:Y6 blend, either an or donor, significantly reduces excessive aggregation facilitates harmonized distribution mobilities by modulating crystallization properties materials. This strategic intervention leads marked improvement VOC fill factor (FF). Consequently, power conversion efficiency (PCE) optimized Z10:(Y6:i-IEDTB) ternary device is elevated impressive 17.70%, surpassing 16.50% binary OSC. Besides, after doping 5% weight replaced that Z10, device's VOC, FF were increased 0.846 V 78.08% respectively, resulting enhanced PCE 17.47%. Further investigation demonstrates universality PM6:BTP-eC9-based PM6:L8-BO-based achieving champion efficiencies 18.14 18.08%, respectively. work highlights key role complementary component crystallographic order carrier balance within Y-type acceptor-based OSCs.

Язык: Английский

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Central core regulation by methoxy in quinoxaline-based non-fullerene acceptors for over 19% efficiency organic solar cells

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 159972 - 159972

Опубликована: Янв. 1, 2025

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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19.32% Efficiency Polymer Solar Cells Enabled by Fine‐Tuning Stacking Modes of Y‐Type Molecule Acceptors: Synergistic Bromine and Fluorine Substitution of the End Groups

Advanced Materials, Год журнала: 2023, Номер 36(11)

Опубликована: Дек. 15, 2023

Abstract The success of Y6‐type nonfullerene small molecule acceptors (NF‐SMAs) in polymer solar cells (PSCs) can be attributed to their unique honeycomb stacking style, which leads favorable thin‐film morphologies. intermolecular interactions related the crystallization tendency these NF‐SMAs is closely governed by electron accepting end groups. For example, high performance Y6 derivative L8‐BO (BTP‐4F) presents three types modes contrast two Y6. Hence, it ultimately interesting obtain more insight on packing properties and preferences influenced chemical modifications such as group engineering. This work designs synthesizes asymmetric symmetric derivatives with brominated groups explores various modes. BTP‐3FBr displays an optimized thin film morphology, leading a decent power conversion efficiency (PCE) 18.34% binary devices top PCE 19.32% ternary containing 15 wt% IDIC second acceptor.

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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C-shaped ortho-benzodipyrrole-based acceptors with different electronic effects of top substituents for as-cast green-solvent processed high-performance organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(18), С. 6844 - 6855

Опубликована: Янв. 1, 2024

We systematically investigated the effects of top substituents on physicochemical properties SMAs and achieved highest PCE for OSCs processed using a non-halogenated solvent without any extra treatment.

Язык: Английский

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